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    Running Races in Colorado

    353 upcoming races across Colorado, from 5Ks to ultras. Run This events are listed first — search, pick a date, or jump to a city.

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    353 races

    Sun, Sep 20, 2026

    18th Annual Be Ovary Aware 5k run 3k walk

    Colorado Springs, CO

    Outside5K1.9 mi

    Sun, Dec 6, 2026

    RunDenver Series 2026-27

    Denver, CO

    Outside5K10KMarathon

    Sun, Dec 6, 2026

    Rudolph Ramble 5K Run/Walk

    Denver, CO

    Outside5K

    Sun, Jan 17, 2027

    Polar Bear 5K

    Denver, CO

    Outside

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    Sun, Feb 7, 2027

    Super Bowl 5K

    Denver, CO

    Outside

    Sun, Feb 14, 2027

    Valentine's Day 4M

    Denver, CO

    Outside

    Sun, Mar 7, 2027

    That Dam Run 13.1, 10K, 5K

    Arapahoe County, CO

    Outside5K10K13 m

    Sun, Sep 20, 2026

    20th Annual Golden Gallop

    Golden, CO

    Outside5K10K12.4 mi

    Sun, Sep 20, 2026

    Expo Park XC Runs

    Aurora, CO

    Outside5K1.2 mi1.9 mi2.5 mi

    Sun, Sep 20, 2026

    Fall Equinox

    Fort Collins, CO

    OutsideMarathon5.0 mi

    Sun, Sep 20, 2026

    Chile & Frijole Hot to Trot 5K & 10K

    Pueblo, CO

    Outside5K10K

    Sun, Sep 20, 2026

    Connection 5k

    CARBONDALE, CO

    Outside5K

    Sun, Sep 20, 2026

    Pikes Peak Marathon

    Manitou Springs, CO

    OutsideMarathon

    Sun, Sep 20, 2026

    Farmers 5000

    Wheat Ridge, CO

    Outside5K

    Mon, Sep 21, 2026

    Mountain Lions XC Program

    Boulder, CO

    Outside

    Tue, Sep 22, 2026

    Nutrition for Women who Mountain Bike - with Audra Holck!

    Colorado Springs, CO

    Outside

    Wed, Sep 23, 2026

    CG Adventure Club - Elevation Everest

    Winter Park, CO

    Outside22.0 mi42.0 mi

    Fri, Sep 25, 2026

    NW Open Spaces 5k XC PR Challenge

    Northglenn, CO

    Outside5K

    Fri, Sep 25, 2026

    Red Feather Trail Jamboree

    Red Feather Lakes, CO

    Outside50.0 mi31.1 miMarathon94.0 mi

    Fri, Sep 25, 2026

    2026 Skate for Chicken

    Colorado Springs, CO

    Outside

    Fri, Sep 25, 2026

    Boggy Draw Bear Chase

    Dolores, CO

    Outside1.9 mi5K

    Sat, Sep 26, 2026

    West Line Winder

    Buena Vista, CO

    Outside31.1 mi18.6 mi

    Sat, Sep 26, 2026

    Bayfield Heritage Days 5k

    Bayfield, CO

    Outside5K

    Sat, Sep 26, 2026

    HRCA Oktoberfest 5K

    Littleton, CO

    Outside5K

    Sat, Sep 26, 2026

    Mountains to the Desert Classic

    Telluride, CO

    Outside103.0 mi73.0 mi110.0 mi

    Sat, Sep 26, 2026

    25th Annual Black Canyon Triathlon

    Montrose, CO

    Outside5K

    Sat, Sep 26, 2026

    Denver Rotary Club Cycling to Serve 2026

    Denver, CO

    Outside

    Sat, Sep 26, 2026

    Mesa County Search & Rescue 5K

    Fruita, CO

    Outside5K

    Sat, Sep 26, 2026

    NIGHT NATION RUN - DENVER

    Commerce City, CO

    Outside5K

    Sat, Sep 26, 2026

    Crested Butte Ultra

    Crested Butte, CO

    Outside50.0 mi34.2 mi21.7 mi

    Sat, Sep 26, 2026

    Estes Epic

    Estes Park, CO

    Outside31.0 mi15.0 mi62.0 mi

    Sat, Sep 26, 2026

    Pagosa Mountain Chile Cha Cha Trail Races

    Pagosa Springs, CO

    Outside5K10K

    Sat, Sep 26, 2026

    Oktoberfest Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Sep 26, 2026

    Run for Donuts 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Sep 26, 2026

    OUTLAST COLORADO SPRINGS

    Colorado Springs, CO

    Outside18.0 mi

    Sat, Sep 26, 2026

    Run For Your Flapjacks 5K

    Oak Creek, CO

    Outside5K

    Sat, Sep 26, 2026

    Mountain Marmot Trail Run presented by Durango Running Company

    Durango, CO

    Outside12.0 mi

    Sat, Sep 26, 2026

    McGinn Memorial Cross Country Challenge

    Pagosa Springs, CO

    Outside1.9 mi5K

    Sat, Sep 26, 2026

    Runway 5K - Run for the Angels

    Broomfield, CO

    Outside5K

    Sat, Sep 26, 2026

    Lisa Nelson’s Mustang Stampede 5K

    Arvada, CO

    Outside5K

    Sat, Sep 26, 2026

    Parker Parks and Recreation So Long to Summer 5K/10K

    Parker, CO

    Outside5K10K

    Sat, Sep 26, 2026

    Sangre de Cristo Trail Festival

    Westcliffe, CO

    Outside8.0 mi16.8 mi31.1 mi50.0 mi

    Sun, Sep 27, 2026

    Sawatch Ascent

    Nathrop, CO

    Outside31.1 mi

    Sun, Sep 27, 2026

    Greenland Open Space Pack Burro Race presented by Double Rainbow Ranch (8 Mile and 3 Mile)

    Larkspur, CO

    Outside8.0 mi3.0 mi

    Sun, Sep 27, 2026

    WWE ANNUAL RUN WITH THE WOLVES

    Arvada, CO

    Outside5K1000 m

    Sun, Sep 27, 2026

    14er Fest 14K & 5K

    Buena Vista, CO

    Outside8.7 mi5K

    Sun, Sep 27, 2026

    RMRR Fall Marathon Training Series #3

    Thornton, CO

    Outside10.0 mi20.0 mi

    Sun, Sep 27, 2026

    Grand Valley Brew Runs

    Grand Junction, CO

    Outside5K

    Sun, Sep 27, 2026

    Joy & Justice 5k

    Timnath, CO

    Outside5K1 mile

    Sun, Sep 27, 2026

    Pat Mahan Memorial Foundation 5K

    Wiggins, CO

    Outside5K

    Sun, Sep 27, 2026

    Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado

    Boulder, CO

    OutsideMarathon5K10K

    Sun, Sep 27, 2026

    Girls on the Run Rockies Boulderthon SoleMates 2026

    Boulder, CO

    OutsideMarathon10K

    Sun, Sep 27, 2026

    Healthy Kids Running Series Fall 2026 - La Junta, CO

    La Junta, CO

    Outside4.0 mi2.0 mi1 mile

    Sun, Sep 27, 2026

    Colorado Coyotes Youth XC Invitational

    Cenennial, CO

    Outside1.2 mi1.9 mi2.5 mi

    Sun, Sep 27, 2026

    Flyin' Lion 5K

    Littleton, CO

    Outside5K

    Thu, Oct 1, 2026

    Segment Traildown

    Fort Collins, CO

    Outside

    Fri, Oct 2, 2026

    Water For People World Water Classic

    Anywhere, CO

    Outside3.7 mi37.3 mi

    Sat, Oct 3, 2026

    Mustang Music 5K

    Fort Collins, CO

    Outside5K1 mile

    Sat, Oct 3, 2026

    HRCA Wildcat Mountain Trail Races

    Littleton, CO

    Outside10.0 mi10K

    Sat, Oct 3, 2026

    Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon

    Canon City, CO

    Outside5K8.0 miMarathon10K

    Sat, Oct 3, 2026

    Homecoming 5K at Colorado State University

    Fort Collins, CO

    Outside5K

    Sat, Oct 3, 2026

    Splashland Triathlon

    Alamosa, CO

    Outside

    Sat, Oct 3, 2026

    Spooky Sprint - Denver

    Littleton, CO

    Outside50 m1 mile5K10K

    Sat, Oct 3, 2026

    Lafayette Music Fest -5K - 10K

    Lafayette, CO

    Outside10K5K

    Sat, Oct 3, 2026

    OUTLAST DENVER

    Littleton, CO

    Outside18.0 mi

    Sat, Oct 3, 2026

    Ethiorado 5K Run/Walk

    Aurora, CO

    Outside5K

    Sat, Oct 3, 2026

    Family Soccer 5k run

    Aurora, CO

    Outside3.0 mi

    Sat, Oct 3, 2026

    Ethiopians 5K

    Aurora, CO

    Outside5K

    Sat, Oct 3, 2026

    FAMpoint5k

    Grand Junction, CO

    Outside500 m

    Sat, Oct 3, 2026

    Rainbow Trail Lutheran Camp's 20th Annual Grace Race 5k

    Denver, CO

    Outside5K

    Sat, Oct 3, 2026

    Big Waves Family Superhero 5K run/walk

    Westminster, CO

    Outside5K

    Sat, Oct 3, 2026

    I Can 5k

    Thornton, CO

    Outside5K

    Sat, Oct 3, 2026

    PRA Miner Gold Rush

    Broomfield, CO

    Outside5K1 mile

    Sat, Oct 3, 2026

    Emerald Mountain Trail Run

    Steamboat Springs, CO

    Outside7.5 mi4.0 mi

    Sat, Oct 3, 2026

    Colorado Springs Marathon, Half, 5K, and Kids K

    Colorado Springs, CO

    OutsideMarathon5K1000 m

    Sat, Oct 3, 2026

    Nielson Challenge

    Colorado Springs, CO

    Outside2.0 mi

    Sun, Oct 4, 2026

    RMRR October 5k/8mi

    Aurora, CO

    Outside8.0 mi5K

    Sun, Oct 4, 2026

    Strides for Sierra 5K run/walk

    Arvada, CO

    Outside5K1000 m

    Sun, Oct 4, 2026

    Liberty Energy 5K - Benefiting the Bettering Human Lives Foundation

    Denver, CO

    Outside5K1000 m

    Sun, Oct 4, 2026

    Rubey Rescue Run

    Aspen, CO

    Outside3.5 mi1 mile

    Sun, Oct 4, 2026

    OTILLO Swimrun Colorado

    Fort Collins, CO

    Outside

    Sun, Oct 4, 2026

    Rolland Moore Park T&H 4K

    Fort Collins, CO

    Outside2.5 mi

    Sun, Oct 4, 2026

    Kids' Fall Series - Where Kids Run Free!

    Colorado Springs, CO

    Outside

    Sun, Oct 4, 2026

    Fall Series - Get Dirty! Get Muddy!

    Colorado Springs, CO

    Outside3.8 mi4.0 mi5.4 mi7.3 mi

    Sun, Oct 4, 2026

    Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

    Windsor, CO

    OutsideMarathon10K5K1 mile

    Wed, Oct 7, 2026

    Fall Foliage Fun Run

    Salida, CO

    Outside5K

    Sat, Oct 10, 2026

    The Roaring Fork Splash for Cash, a fundraiser for the Aspen Swim Club

    Aspen, CO

    Outside200 m

    Sat, Oct 10, 2026

    Dialysis Dash 5K- Canceled

    Grand Junction, CO

    Outside5K

    Sat, Oct 10, 2026

    Manitou 5K

    Manitou Springs, CO

    Outside5K

    Sat, Oct 10, 2026

    Kipling Villas 5K - 2026

    Littleton, CO

    Outside5K

    Sat, Oct 10, 2026

    Breckenridge RunFest

    Breckenridge, CO

    OutsideMarathon10K5K1 mile

    Sat, Oct 10, 2026

    Footsteps for Families 5k Fun Run & Concert

    Windsor, CO

    Outside5K

    Sat, Oct 10, 2026

    Cookie Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Oct 10, 2026

    Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Oct 10, 2026

    Faith & Blue 5K

    Fort Morgan, CO

    Outside5K

    Sat, Oct 10, 2026

    ASDAsh 5K to Beat Tooth Decay

    Aurora, CO

    Outside5K

    Sat, Oct 10, 2026

    Cerox Championships

    Frederick, CO

    Outside

    Sat, Oct 10, 2026

    Natalie R Color Run Test

    Evergreen, CO

    Outside

    Sat, Oct 10, 2026

    Lions Roar for Fitness 5k/2.5k Challenge

    Pueblo, CO

    Outside5K1.6 mi

    Sat, Oct 10, 2026

    The Long View Marathon

    Fort Collins, CO

    OutsideMarathon5K

    Sat, Oct 10, 2026

    Suffer Better 10th Annual Fall Trail Runs

    Pine, CO

    Outside31.1 mi15.5 mi5K

    Sun, Oct 11, 2026

    Westy Half & 5k

    Westminster, CO

    OutsideMarathon5K

    Sun, Oct 11, 2026

    EDT XC Showdown

    Aurora, CO

    Outside1.9 mi2.5 mi1.2 mi

    Sun, Oct 11, 2026

    Durango Marathon

    Durango, CO

    OutsideMarathon

    Sun, Oct 11, 2026

    The Moony Pride 5k

    Fort Collins, CO

    Outside5K

    Sun, Oct 11, 2026

    Your Story Isn't Over 5k/10k/Kids 1-Mile

    Littleton, CO

    Outside1 mile10K5K

    Sun, Oct 11, 2026

    Kitty Beanz Cat 5k

    Aurora, CO

    Outside5K

    Fri, Oct 16, 2026

    Whistle Pig Invitational

    Craig, CO

    Outside5K

    Sat, Oct 17, 2026

    Blue Sky Trail Marathon & Half Marathon

    Fort Collins, CO

    Outside26.7 mi13.8 mi

    Sat, Oct 17, 2026

    Beti Bike Bash

    Elbert, CO

    Outside10.0 mi3.0 mi4.5 mi

    Sat, Oct 17, 2026

    Witch Paddle

    Littleton, CO

    Outside

    Sat, Oct 17, 2026

    Hyrox Sim

    Frederick, CO

    Outside

    Sat, Oct 17, 2026

    Living Water 5K and Family Fun Walk/Jog

    Denver, CO

    Outside5K1 mile

    Sat, Oct 17, 2026

    The Great Pumpkin Haul

    Fruita, CO

    Outside2.0 mi

    Sat, Oct 17, 2026

    Chili Chase

    Durango, CO

    Outside6.5 mi

    Sat, Oct 17, 2026

    A2A Hero Run/Walk 5K

    Pueblo, CO

    Outside3.0 mi

    Sat, Oct 17, 2026

    Running Scared 5K/13K - Denver

    Littleton, CO

    Outside5K8.1 mi11.2 mi

    Sat, Oct 17, 2026

    Longmonster Dash 5k

    Longmont, CO

    Outside5K

    Sat, Oct 17, 2026

    The Great Trailhead Foot Race 5 & 10 Miler

    Lakewood, CO

    Outside5.0 mi10.0 mi

    Sat, Oct 17, 2026

    Indian Creek Trail Runs

    Sedalia, CO

    Outside5.5 mi15.0 mi35.0 mi54.0 mi

    Sun, Oct 18, 2026

    Halloween Hustle for Charity

    Glenwood Springs, CO

    Outside1500 m3.4 mi

    Sun, Oct 18, 2026

    Running Scared 5K/13K - Colorado Springs

    Colorado Springs, CO

    Outside5K8.1 mi11.2 mi

    Sun, Oct 18, 2026

    Fall Harvest Kids Duathlon

    Colorado Springs, CO

    Outside

    Sun, Oct 18, 2026

    The KEG Enduro

    Idaho Springs, CO

    Outside6.0 mi

    Sun, Oct 18, 2026

    The Palmer Lake .5K (Yes "Point" 5)

    Palmer Lake, CO

    Outside5K

    Wed, Oct 21, 2026

    DU Crimson Classic 5K Run/1.5 Mile Walk

    Denver, CO

    Outside5K1.5 mi

    Sat, Oct 24, 2026

    Apex Foundation Trick or Trot 5K & Halloween Hunt Powered by REP Fitness

    Arvada, CO

    Outside5K1 mile

    Sat, Oct 24, 2026

    YMCA of Pueblo Race Series

    Pueblo, CO

    Outside5K

    Sat, Oct 24, 2026

    YMCA of Pueblo Spooky Sprint 5K

    Pueblo, CO

    Outside5K

    Sat, Oct 24, 2026

    Race to Cure Sarcoma Denver

    Denver, CO

    Outside5K1000 m

    Sat, Oct 24, 2026

    McGraw Memorial Park "Quick Draw @ McGraw" 2 Mile Trail Race

    Bailey, CO

    Outside2.0 mi

    Sat, Oct 24, 2026

    Zedikiah Scholarship 5K

    Denver, CO

    Outside5K

    Sat, Oct 24, 2026

    Mancos Cowboy Half Marathon, 5K, and Fun Run

    Mancos, CO

    OutsideMarathon5K1 mile

    Sat, Oct 24, 2026

    Hoofin' It Through the Hollows 5K

    Centennial, CO

    Outside5K

    Sat, Oct 24, 2026

    YMCA Creepy Crawl 5K presented by Corwin Honda

    Palmer Lake, CO

    Outside5K1287 m

    Sun, Oct 25, 2026

    Ghosts and Goblins 5K/10K

    Denver, CO

    Outside5K10K

    Sun, Oct 25, 2026

    The 14th Annual Odyssey Odyssey - 2026

    Denver, CO

    Outside5K1 mile

    Sat, Oct 31, 2026

    HRCA Backcountry Wilderness Half Marathon

    Lone Tree, CO

    OutsideMarathon

    Sat, Oct 31, 2026

    Halloween Zombie Fun Run 5k & 1mile

    Idaho Springs, CO

    Outside5K1 mile

    Sat, Oct 31, 2026

    Spooky Sprint - Colorado Springs

    Colorado Springs, CO

    Outside1 mile5K10KMarathon

    Sat, Oct 31, 2026

    I Ain't Scared (of 5k)

    Thornton, CO

    Outside5K

    Sat, Oct 31, 2026

    PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Oct 31, 2026

    Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Oct 31, 2026

    Woodmen Hills Monster Mash 5k and Beer Run

    Peyton, CO

    Outside5K

    Sat, Oct 31, 2026

    Halloween 5K Fundraiser!

    Grand Junction, CO

    Outside5K

    Sat, Oct 31, 2026

    Halloween Fun 5k

    Steamboat Springs, CO

    Outside5K

    Sun, Nov 1, 2026

    RMRR November 5k/15k

    Denver, CO

    Outside9.3 mi5K

    Sun, Nov 1, 2026

    All-Out Kooky-Spooky

    Golden, CO

    OutsideMarathon10K5K

    Sun, Nov 1, 2026

    Girls on the Run Northern Colorado Fall 5K

    Fort Collins, CO

    Outside5K

    Sun, Nov 1, 2026

    Feet for Justice Run

    Denver, CO

    Outside10K5K

    Sat, Nov 7, 2026

    Alamosa Veterans Memorial Park Race

    Alamosa, CO

    Outside5K10K

    Sat, Nov 7, 2026

    Turkey Trails- Denver

    Littleton, CO

    Outside50 m1 mile5K10K

    Sat, Nov 7, 2026

    Colorado 24 Hour Run

    Fort Collins, CO

    Outside

    Sat, Nov 7, 2026

    Kessel Run Ultra

    Fruita, CO

    Outside50.0 mi40.0 mi20.0 mi10.0 mi

    Sat, Nov 7, 2026

    Break a Leg 5k

    Grand Junction, CO

    Outside5K1000 m

    Sat, Nov 7, 2026

    Excel Eagle Trot 5K/1K Family Fun Run

    Arvada, CO

    Outside5K1000 m

    Sat, Nov 7, 2026

    12th edition Sole Mates 5k & Brew Fest presented by Shoes & Brews and Left Hand Brewing

    Longmont, CO

    Outside5K

    Sat, Nov 7, 2026

    Bell Ringer 2 Miler

    Loveland, CO

    Outside2.0 mi

    Sat, Nov 7, 2026

    City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)

    Denver, CO

    Outside5K10K1 mile

    Sun, Nov 8, 2026

    Turkey Trails - Colorado Springs

    Colorado Springs, CO

    Outside50 m1 mile5K10K

    Sun, Nov 8, 2026

    Colorado Springs Veterans Day 5k

    Colorado Springs, CO

    Outside5K

    Sun, Nov 8, 2026

    Canya Cañon Trail Race & Hike

    Colorado Springs, CO

    Outside4.0 mi2.5 mi

    Fri, Nov 13, 2026

    Friday The 13K - Castle Rock MEET UP

    Castle Rock, CO

    Outside8.1 mi4.0 mi

    Sat, Nov 14, 2026

    Leyden Rock Turkey Trot 5K

    Arvada, CO

    Outside5K

    Sat, Nov 14, 2026

    Colorado State Youth Cross Country Championships

    Aurora, CO

    Outside1.2 mi1.9 mi2.5 mi

    Sat, Nov 14, 2026

    Run for Mental Health 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Nov 14, 2026

    Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Nov 14, 2026

    Salute to Veterans 5K/10K/Half Marathon - Denver

    Aurora, CO

    Outside5K10KMarathon

    Sat, Nov 14, 2026

    Lone Tree Reckoning Half and 5K

    Loveland, CO

    OutsideMarathon5K

    Sat, Nov 14, 2026

    Denver Veterans Day Run

    Denver, CO

    Outside5K10K

    Sun, Nov 15, 2026

    Girls on the Run Denver Metro 5K

    Denver, CO

    Outside5K

    Sun, Nov 15, 2026

    The Wash Park Circuit, Powered by New Balance

    Denver, CO

    Outside2.2 mi402 m

    Sun, Nov 15, 2026

    Salute to Veterans 5K/10K/Half Marathon - Colorado Springs

    Colorado Springs, CO

    Outside5K10KMarathon

    Sat, Nov 21, 2026

    TURKEY TREK (13.1, 10k, 5k & 2k)

    Arvada, CO

    OutsideMarathon10K5K1.2 mi

    Sat, Nov 21, 2026

    Chase the Glow

    Estes Park, CO

    Outside4.0 mi1 mile

    Sat, Nov 21, 2026

    Pumpkin Pie 5K/10K

    Denver, CO

    Outside5K10K

    Sat, Nov 21, 2026

    Turkey Trot Predict

    Colorado Springs, CO

    Outside5K

    Sat, Nov 21, 2026

    Fall Series and Community Cup Awards + Membership Dinner

    Colorado Springs, CO

    Outside

    Thu, Nov 26, 2026

    Huffin' for Stuffin' 2-Mile Fun Run

    Loveland, CO

    Outside2.0 mi

    Thu, Nov 26, 2026

    The Pilgrimage Run 2026

    Erie, CO

    Outside2.0 mi4.0 mi

    Thu, Nov 26, 2026

    Parker Parks and Recreation Turkey Day 5K FUN Run/Walk

    Parker, CO

    Outside5K

    Thu, Nov 26, 2026

    Buena Vista Turkey Trot 5K & Family Fun Run

    Buena Vista, CO

    Outside1 mile5K

    Thu, Nov 26, 2026

    2026 Loveland Turkey Trot

    Loveland, CO

    Outside5K

    Thu, Nov 26, 2026

    Pelican Lakes Turkey Trot

    Windsor, CO

    Outside5K

    Thu, Nov 26, 2026

    Alpine Bank Boulder Thanksgiving Day 5K

    Boulder, CO

    Outside5K800 m

    Thu, Nov 26, 2026

    Broomfield Turkey Day 5K/10K

    Broomfield, CO

    Outside10K5K2.0 mi

    Thu, Nov 26, 2026

    TurCreek Trot 5K

    Greenwood Village, CO

    Outside5K

    Thu, Nov 26, 2026

    Harvesting Hope 5k

    Denver, CO

    Outside5K

    Thu, Nov 26, 2026

    NCMC Turkey Trot

    Greeley, CO

    Outside5K1.2 mi

    Thu, Nov 26, 2026

    Fort Collins Thanksgiving Day Run

    Fort Collins, CO

    Outside4.0 mi

    Thu, Nov 26, 2026

    Winter Park Turkey Trot 5K

    Winter Park, CO

    Outside5K

    Thu, Nov 26, 2026

    Durango Turkey Trot presented by Animas Surgical Hospital

    Durango, CO

    Outside5.0 mi1 mile

    Thu, Nov 26, 2026

    YMCA Turkey Trot 5K presented by Corwin Honda

    Colorado Springs, CO

    Outside5K998 m

    Thu, Nov 26, 2026

    AdventHealth Avista Louisville Turkey Trot

    Louisville, CO

    Outside5K

    Thu, Nov 26, 2026

    YMCA of Pueblo Turkey Trot

    Pueblo, CO

    Outside5K

    Thu, Nov 26, 2026

    Gobble Wobble Run 2026

    Littleton, CO

    Outside5K

    Fri, Nov 27, 2026

    Tardy Turkey Trot

    Estes Park, CO

    Outside5K

    Fri, Nov 27, 2026

    Christmas Mountain 5 Mile Run

    Salida, CO

    Outside5.0 mi1 mile

    Sat, Nov 28, 2026

    Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Nov 28, 2026

    Thanksgiving Gobble Trot Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Dec 5, 2026

    All-Out Fa La La

    Westminster, CO

    OutsideMarathon10K5K

    Sat, Dec 5, 2026

    Candy Cane Course - Colorado Springs

    Colorado Springs, CO

    Outside50 m1 mile5K10K

    Sat, Dec 5, 2026

    Onesie Dash

    Red Feather Lakes, CO

    Outside1 mile

    Sat, Dec 5, 2026

    Chasing Santa 5k/Cycling Santa Toy Drive Presented by: Springs Law Group

    Colorado Springs, CO

    Outside5K6.0 mi10.0 mi21.0 mi

    Sat, Dec 5, 2026

    Toy Drop

    Loveland, CO

    Outside5K10K9.3 mi

    Sat, Dec 5, 2026

    Sawmill Trail Runs

    Pine, CO

    Outside8.1 mi16.1 mi31.7 mi

    Sat, Dec 5, 2026

    2026 Summit for Life

    Aspen, CO

    Outside2.5 mi

    Sun, Dec 6, 2026

    RMRR December 4.5mi

    Denver, CO

    Outside4.5 mi

    Sun, Dec 6, 2026

    Candy Cane Course - Denver

    Westminster, CO

    Outside50 m1 mile5K10K

    Sun, Dec 6, 2026

    Rock Canyon Half Marathon- 40th Anniversary Run!

    Pueblo, CO

    OutsideMarathon5K

    Sat, Dec 12, 2026

    Superior Stocking Run

    Superior, CO

    Outside5K

    Sat, Dec 12, 2026

    WinterFest 5k & Fun Run

    Thornton, CO

    Outside5K1200 m

    Sat, Dec 12, 2026

    Santa Shuffle 5K

    Littleton, CO

    Outside5K

    Sat, Dec 12, 2026

    Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Dec 12, 2026

    Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Dec 12, 2026

    YMCA Jingle Jog 5K presented by Corwin Honda

    Fountain, CO

    Outside5K1287 m

    Sat, Dec 12, 2026

    Santa Catch 5k & 10k

    Windsor, CO

    Outside5K10K1 mile

    Sun, Dec 13, 2026

    2026 Jingle Bell Run - Colorado

    Denver, CO

    Outside5K1 mile100 m

    Sat, Dec 19, 2026

    Santa's Dash for Ca$h

    Denver, CO

    Outside5K

    Sat, Dec 19, 2026

    Sweaty Sweater 5k

    Fort Collins, CO

    Outside5K1 mile

    Sun, Dec 20, 2026

    Ugly Sweater 5K

    Denver, CO

    Outside5K

    Sat, Dec 26, 2026

    A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Dec 26, 2026

    New Year's Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Thu, Dec 31, 2026

    Hands & Voices New Year Virtual 5K: Trails to the Summit

    Boulder, CO

    Outside5K

    Thu, Dec 31, 2026

    James Pre-Paid Teams Test

    Lyons, CO

    Outside7.5 mi

    Thu, Dec 31, 2026

    run.Windsor Gift Cards

    Windsor, CO

    Outside

    Thu, Dec 31, 2026

    Resolution Run - Fort Collins

    Fort Collins, CO

    Outside5K

    Fri, Jan 1, 2027

    Resolute Runner 5k

    Arvada, CO

    Outside5K

    Sat, Jan 2, 2027

    YMCA of Pueblo Hot Chocolate 5K

    Pueblo, CO

    Outside5K

    Sat, Jan 9, 2027

    All-Out Polar Prowl

    Arvada, CO

    OutsideMarathon10K5K

    Sat, Jan 9, 2027

    Winter Series - The Coolest Race in Town!

    Colorado Springs, CO

    Outside10K8.0 mi10.0 mi12.4 mi

    Sat, Jan 16, 2027

    ALMAGEDDON Winter Triathlon presented by the Alma Foundation

    Alma, CO

    Outside12.5 mi

    Sat, Jan 16, 2027

    MLK Jr. Freedom Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Jan 16, 2027

    Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Jan 17, 2027

    Colorado Cold Snap

    Louisville, CO

    Outside5K10K

    Sat, Jan 23, 2027

    Chilly Willy 5K/10K/Half Marathon - Colorado Springs

    Colorado Springs, CO

    Outside5K10KMarathon8.1 mi

    Sun, Jan 24, 2027

    Yeti Chase 5k/10k

    Morrison, CO

    Outside5K10K

    Sun, Jan 24, 2027

    Freakin Freezin 5K - Denver

    Denver, CO

    Outside5K

    Sat, Jan 30, 2027

    Alley Loop

    Crested Butte, CO

    OutsideMarathon10K5K1.9 mi

    Sat, Jan 30, 2027

    Time Travel Half-Marathon/5K/10K - Denver

    Denver, CO

    Outside100 m1 mile5K10K

    Sat, Jan 30, 2027

    Coffee Lover Run DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Jan 30, 2027

    Run for Donut DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Jan 31, 2027

    Time Travel Half-Marathon/5K/10K - Colorado Springs

    Colorado Springs, CO

    Outside100 m1 mile5K10K

    Sat, Feb 6, 2027

    All-Out Mardi Crawl

    Arvada, CO

    OutsideMarathon10K5K

    Sat, Feb 6, 2027

    Westy Winter Waggle 5&10k

    Westminster, CO

    Outside5K10K

    Sat, Feb 6, 2027

    Stories Trail Runs

    Colorado Springs, CO

    Outside6.7 miMarathon19.6 mi

    Sat, Feb 13, 2027

    Valentine's Day Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Feb 13, 2027

    Run for Chocolate 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Feb 13, 2027

    Heart Throb 5k

    Arvada, CO

    Outside5K

    Sun, Feb 14, 2027

    Ralston Creek Half Marathon & 5k

    Arvada, CO

    OutsideMarathon5K

    Sun, Feb 14, 2027

    Gothic Mountain Tour

    Crested Butte, CO

    Outside18.0 mi24.0 mi

    Sun, Feb 14, 2027

    The Toyota Super Half Marathon™& Game Day 5K™

    Colorado Springs, CO

    OutsideMarathon5K

    Sat, Feb 20, 2027

    Chilly Cheeks Duathlon

    Englewood, CO

    Outside

    Sat, Feb 27, 2027

    Run Together Against Breast Cancer DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Feb 27, 2027

    Run For Mental Health DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Feb 28, 2027

    Highlands Ranch 5k

    Highlands Ranch, CO

    Outside5K

    Sat, Mar 6, 2027

    Sharin' O' The Green 5k

    Fort Collins, CO

    Outside5K

    Sat, Mar 6, 2027

    Time to Paddy 5K/10K & Lucky 13.1 13.1 - Denver

    Denver, CO

    Outside1 mile5K10KMarathon

    Sun, Mar 7, 2027

    Time to Paddy 5K/10K & Lucky 13.1 - Colorado Springs

    Colorado Springs, CO

    Outside1 mile5K10KMarathon

    Sat, Mar 13, 2027

    22nd Annual Run Through Time Trail Marathon and Half Marathon

    Salida, CO

    OutsideMarathon2.0 mi

    Sat, Mar 13, 2027

    Erin Go Bragh 7.77k

    Westminster, CO

    Outside4.8 mi

    Sun, Mar 14, 2027

    Lucky Brew Race 5K, 10K, 15k & Half Marathon

    Severance, CO

    Outside5K10K9.3 mi966 m

    Sat, Mar 20, 2027

    Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Mar 20, 2027

    St. Paddy's Day Lucky Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Mar 21, 2027

    All-Out Spring Fever

    Golden, CO

    OutsideMarathon10K5K

    Sun, Mar 21, 2027

    Spring Equinox

    Wellington, CO

    OutsideMarathon5K

    Sat, Mar 27, 2027

    Always Hope Easter Run DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Mar 27, 2027

    SuperHeroes Run DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Mar 28, 2027

    Central Park 5k

    Denver, CO

    Outside5K

    Sat, Apr 3, 2027

    Grand Valley Oncology - Life In Color 5K

    Grand Junction, CO

    Outside5K

    Sun, Apr 4, 2027

    Three Creeks Half Marathon

    Englewood, CO

    OutsideMarathon

    Sun, Apr 4, 2027

    Donut Dash

    Denver, CO

    Outside5K

    Sat, Apr 10, 2027

    Sloth Run 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Apr 11, 2027

    Platte River Half-Marathon, Relay & 5k

    Littleton, CO

    OutsideMarathon5K

    Sun, Apr 11, 2027

    NoCo Urban Ultra & Relay

    Bellvue, CO

    Outside50.0 mi100.0 mi

    Sun, Apr 11, 2027

    Spring Fling Prairie Dog Half, 10k, & 5k

    Arvada, CO

    OutsideMarathon10K5K

    Sun, Apr 18, 2027

    Horsetooth Half Marathon - Presented by Fort Collins Connexion

    Fort Collins, CO

    OutsideMarathon

    Sat, Apr 24, 2027

    All-Out Beat the Heat

    Westminster, CO

    OutsideMarathon10K5K

    Sat, Apr 24, 2027

    DoNot Stop Half Marathon/5K/10K - Colorado Springs

    Colorado Springs, CO

    Outside50 m1 mile5K10K

    Sat, Apr 24, 2027

    Bigfoot Half Marathon

    Estes Park, CO

    OutsideMarathon5K

    Sat, Apr 24, 2027

    Coffee Lover Run DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Apr 24, 2027

    Run for Donut DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, Apr 25, 2027

    DoNot Stop Half Marathon/5K/10K - Denver

    Denver, CO

    Outside50 m1 mile5K10K

    Sun, Apr 25, 2027

    Unicorn 5k (Denver-East)

    Denver, CO

    Outside5K

    Sat, May 1, 2027

    18 Hours of Fruita

    Loma, CO

    Outside7.3 mi

    Sat, May 1, 2027

    Greenland Trail Races

    Larkspur, CO

    Outside31.1 mi15.5 mi8.0 mi4.0 mi

    Sun, May 2, 2027

    Longmont Half & 5k (LM Half)

    Longmont, CO

    OutsideMarathon5K

    Sun, May 2, 2027

    The Colorado Marathon

    Fort Collins, CO

    OutsideMarathon10K5K

    Sun, May 2, 2027

    Emerge 5K

    Boulder, CO

    Outside5K

    Sat, May 8, 2027

    Hometown Half Marathon/5K/10K - Colorado Springs

    Colorado Springs, CO

    Outside50 m1 mile5K10K

    Sat, May 8, 2027

    Colterris Wine Run 5k

    Palisade, CO

    Outside5K

    Sat, May 8, 2027

    Run for Chocolate 5k/10k/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sun, May 9, 2027

    Hometown Half Marathon/5K/10K - Denver

    Denver, CO

    Outside50 m1 mile5K10K

    Sun, May 9, 2027

    Colorado Women's Classic - Westminster

    Westminster, CO

    Outside5K10K10.0 mi

    Sun, May 9, 2027

    Denver Mother's Day 5K

    Denver, CO

    Outside5K

    Sat, May 15, 2027

    Endure Trail Runs

    Divide, CO

    Outside6.8 mi14.1 mi26.5 mi

    Sat, May 15, 2027

    Vallecito Lake Heavy Half

    Bayfield, CO

    Outside14.0 mi

    Sat, May 22, 2027

    Samson's Revenge

    Estes Park, CO

    Outside6.5 mi15.5 mi31.1 mi

    Sat, Jun 5, 2027

    Weld Your Mettle Running Festival

    Eaton, CO

    Outside50.0 mi62.1 mi4.3 mi14.0 mi

    Sun, Jun 6, 2027

    Colorado 13er (Half Marathon/10k/5k)

    Louisville, CO

    OutsideMarathon10K5K

    Sun, Jun 6, 2027

    The Steamboat Marathon

    Steamboat Springs, CO

    OutsideMarathon10K805 m

    Sun, Jun 6, 2027

    Flamingo Day 5K

    Denver, CO

    Outside5K

    Fri, Jun 11, 2027

    M1LE Nation Challenge

    Fort Collins, CO

    Outside1 mile800 m

    Sat, Jun 12, 2027

    All-Out Summer Breeze

    Arvada, CO

    OutsideMarathon10K5K

    Sat, Jun 12, 2027

    KowTown Gravel

    Kremmling, CO

    Outside88.0 mi54.0 mi28.0 mi16.0 mi

    Sat, Jun 12, 2027

    Summits Trail Runs

    Granby, CO

    Outside6.1 mi13.9 mi27.8 mi33.9 mi

    Sat, Jun 12, 2027

    Alpha 5K Challenge

    Boulder, CO

    Outside5K

    Sat, Jun 19, 2027

    Unicorn 5k (North)

    Thornton, CO

    Outside5K1000 m

    Sat, Jun 19, 2027

    Treat Trot - Denver

    Denver, CO

    Outside1 mile5K10K9.3 mi

    Sat, Jun 19, 2027

    Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

    Centennial, CO

    Outside5K10KMarathon1 mile

    Sat, Jun 19, 2027

    Red, White and Brew 5k, 10k & Half Marathon

    Windsor, CO

    Outside5K10KMarathon1 mile

    Sun, Jun 20, 2027

    Treat Trot Colorado Springs

    Colorado Springs, CO

    Outside1 mile5K10K9.3 mi

    Sun, Jun 20, 2027

    Father's Day Classic 10k, 5k, & 1 Mile

    Arvada, CO

    Outside10K5K1 mile

    Fri, Jun 25, 2027

    Race in the Clouds - Alma Dirt Festival 2027

    Alma, CO

    Outside38.0 mi26.0 miMarathon22.0 mi

    Fri, Jun 25, 2027

    South Fork Pandemonium

    South Fork, CO

    Outside

    Sat, Jul 3, 2027

    Red, White, and WARRIOR 5K

    Grand Junction, CO

    Outside5K400 m

    Sun, Jul 4, 2027

    Greeley Freedom 5k Walk & Run

    Greeley, CO

    Outside5K

    Sun, Jul 4, 2027

    Let Freedom Run 5k/10k - Louisville

    Louisville, CO

    Outside5K10K

    Sun, Jul 4, 2027

    Independence Day Freedom 5K

    Buena Vista, CO

    Outside5K1.9 mi

    Fri, Jul 9, 2027

    Silverheels Trail Runs

    Como, CO

    Outside10.8 mi19.1 mi38.3 mi53.8 mi

    Sat, Jul 10, 2027

    All-Out Dog Days

    Westminster, CO

    OutsideMarathon10K5K

    Sat, Jul 10, 2027

    Cookie Chase

    Denver, CO

    Outside5K

    Sat, Jul 17, 2027

    Heatwave Half Marathon/5K/10K - Denver

    Denver, CO

    Outside50 m1 mile5K10K

    Sat, Jul 17, 2027

    Summer Splash Prairie Dog Half, 10k, & 5k

    Castle Rock, CO

    OutsideMarathon10K5K

    Sun, Jul 18, 2027

    Heatwave Half Marathon/5K/10K - Colorado Springs

    Colorado Springs, CO

    Outside50 m1 mile5K10K

    Sun, Jul 25, 2027

    Spirit of the West 5K Run/Walk

    Golden, CO

    Outside5K50 m

    Sat, Jul 31, 2027

    Popsicle 5K/10K/Half - Colorado Springs

    Colorado Springs, CO

    Outside5K10KMarathon

    Sat, Jul 31, 2027

    Eat. Run. Adopt. 10K

    Berthoud, CO

    Outside10K

    Sun, Aug 1, 2027

    Bound for Boston Marathon & Half Marathon - Denver

    Denver, CO

    OutsideMarathon

    Fri, Aug 6, 2027

    Wild West Relay

    Fort Collins, CO

    Outside200.0 mi

    Sat, Aug 7, 2027

    Unicorn 5k (South)

    Highlands Ranch, CO

    Outside5K

    Sat, Aug 7, 2027

    Summer Sizzler- Denver

    Denver, CO

    Outside50 m1 mile5K10K

    Sat, Aug 7, 2027

    All-Out Runapalooza

    Arvada, CO

    OutsideMarathon10K5K

    Sat, Aug 7, 2027

    Kennebec Mountain Run

    Hesperus, CO

    Outside15.0 mi

    Sat, Aug 7, 2027

    Dog Days of Summer

    Longmont, CO

    Outside3.5 mi1000 m

    Sat, Aug 7, 2027

    RoC & Roll 5K: Run, Walk, or Wheel

    Fountain, CO

    Outside5K

    Sat, Aug 7, 2027

    Sheep Mountain Trail Runs

    Fairplay, CO

    Outside14.2 mi33.0 mi53.1 mi

    Sun, Aug 8, 2027

    Summer Sizzler- Colorado Springs

    Colorado Springs, CO

    Outside50 m1 mile5K10K

    Wed, Aug 11, 2027

    Evergreen Mountain Weeknight Race

    Evergreen, CO

    Outside

    Sat, Aug 14, 2027

    Pat's Pony Express

    Woodland Park, CO

    Outside16.0 mi8.0 mi

    Sun, Aug 15, 2027

    Erie Half & 5k

    Erie, CO

    OutsideMarathon5K

    Mon, Aug 16, 2027

    James Test Site

    Lyons, CO

    Outside5K

    Sat, Aug 21, 2027

    Ram Run 5K

    Denver, CO

    Outside5K1 mile

    Sat, Aug 21, 2027

    Byers Peak Stampede Half Marathon & 5K Run

    Fraser, CO

    OutsideMarathon3.0 mi

    Sun, Aug 22, 2027

    Pioneer Prairie Dog Half, 10k & 5k

    Westminster, CO

    OutsideMarathon10K5K

    Sat, Aug 28, 2027

    TBK Bank Thirsty 13 Half Marathon

    Durango, CO

    OutsideMarathon

    Mon, Sep 6, 2027

    Labor Day Half Marathon

    Parker, CO

    OutsideMarathon10K5K

    Sat, Sep 11, 2027

    2027 Lake Nighthorse Triathlon - Sprint and Olympic

    Durango, CO

    Outside16.0 mi32.0 mi

    Sat, Sep 11, 2027

    Golden Harvest Half Marathon & 5K/10K - Denver

    Denver, CO

    Outside50 m1 mile5K10K

    Sat, Sep 11, 2027

    Rampart Rager Gravel

    Colorado Springs, CO

    Outside32.0 mi44.0 mi62.0 mi11.5 mi

    Sat, Sep 11, 2027

    The Denver 5k

    Denver, CO

    Outside5K

    Fri, Feb 10, 2034

    50 States Half Marathon Club General Membership

    Colorado Springs, CO

    OutsideMarathon

    Sat, Feb 11, 2034

    Fifty States Half Marathon Club Life Membership

    Colorado Springs, CO

    OutsideMarathon

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    Races by distance in Colorado

    5K races in Colorado24910K races in Colorado115Half Marathon races in Colorado104Marathon races in Colorado24Ultra races in Colorado25

    Races by city in Colorado

    Denver44Colorado Springs35Centennial32Fort Collins19Arvada
    16
    Littleton13
    Aurora10
    Westminster10
    Pueblo8
    Boulder7
    Grand Junction7
    Durango6
    Windsor6
    Estes Park5
    Loveland5
    Thornton5
    Buena Vista4
    Golden4
    Longmont4
    Louisville4
    Aspen3
    Broomfield3
    Crested Butte3
    Fruita3
    Parker3
    Salida3
    Steamboat Springs3