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Half Marathon Races in Colorado

88 upcoming Half Marathon races across Colorado. Run This events are listed first — pick a city below to narrow it down.

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Cities in ColoradoCentennialColorado SpringsWestminsterFort CollinsArvadaLittleton

88 races

Thu, Aug 6, 2026

Choice City Running Festival

Fort Collins, CO

Outside1 mileMarathon10K5K

Fri, Aug 7, 2026

All-Out Runapalooza

Arvada, CO

OutsideMarathon10K5K

Fri, Aug 14, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Aug 14, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Aug 15, 2026

Erie Half & 5k

Erie, CO

OutsideMarathon5K

Fri, Aug 21, 2026

Staunton Rocks! Marathon and Half Marathon

Pine, CO

OutsideMarathon

Fri, Aug 21, 2026

Byers Peak Stampede Half Marathon & 5K Run

Fraser, CO

OutsideMarathon3.0 mi

Sat, Aug 22, 2026

Pioneer Prairie Dog Half, 10k & 5k

Westminster, CO

OutsideMarathon10K5K

Fri, Aug 28, 2026

TBK Bank Thirsty 13 Half Marathon

Durango, CO

OutsideMarathon

Fri, Aug 28, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Aug 28, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Sep 4, 2026

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

Westminster, CO

Outside50 m1 mile5K10K

Sat, Sep 5, 2026

Golden Harvest Half Marathon & 5k/10k - Colorado Springs

Colorado Springs, CO

Outside50 m1 mile5K10K

Sun, Sep 6, 2026

Labor Day Half Marathon

Parker, CO

OutsideMarathon10K5K

Fri, Sep 11, 2026

Trail Sisters Women's Half Marathon & 10k

Buena Vista, CO

OutsideMarathon10K

Fri, Sep 11, 2026

Black Squirrel Half Marathon

Bellvue, CO

OutsideMarathon

Fri, Sep 11, 2026

National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Sep 11, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Sep 12, 2026

RMRR Fall Marathon Training Series #2

Thornton, CO

Outside12.4 mi18.6 mi

Fri, Sep 18, 2026

Autumn Run

Buena Vista, CO

OutsideMarathon10K5K1000 m

Fri, Sep 18, 2026

All-Out Fall Fest

Westminster, CO

OutsideMarathon10K5K

Fri, Sep 18, 2026

Pikes Peak Ascent

Manitou Springs, CO

Outside13.3 mi

Sat, Sep 19, 2026

Fall Equinox

Fort Collins, CO

OutsideMarathon5.0 mi

Thu, Sep 24, 2026

Red Feather Trail Jamboree

Red Feather Lakes, CO

Outside50.0 mi31.1 miMarathon94.0 mi

Fri, Sep 25, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Sep 25, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Sep 26, 2026

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

Boulder, CO

OutsideMarathon5K10K

Fri, Oct 2, 2026

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

Canon City, CO

Outside5K8.0 miMarathon10K

Fri, Oct 2, 2026

Spooky Sprint - Denver

Littleton, CO

Outside50 m1 mile5K10K

Fri, Oct 2, 2026

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

Colorado Springs, CO

OutsideMarathon5K1000 m

Sat, Oct 3, 2026

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

Windsor, CO

OutsideMarathon10K5K1 mile

Fri, Oct 9, 2026

Breckenridge RunFest

Breckenridge, CO

OutsideMarathon10K5K1 mile

Fri, Oct 9, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Oct 9, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Oct 9, 2026

The Long View Marathon

Fort Collins, CO

OutsideMarathon5K

Sat, Oct 10, 2026

Westy Half & 5k

Westminster, CO

OutsideMarathon5K

Sat, Oct 10, 2026

Durango Marathon

Durango, CO

OutsideMarathon

Fri, Oct 16, 2026

Blue Sky Trail Marathon & Half Marathon

Fort Collins, CO

Outside26.7 mi13.8 mi

Fri, Oct 23, 2026

Mancos Cowboy Half Marathon, 5K, and Fun Run

Mancos, CO

OutsideMarathon5K1 mile

Fri, Oct 30, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Oct 30, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Oct 31, 2026

All-Out Kooky-Spooky

Golden, CO

OutsideMarathon10K5K

Fri, Nov 6, 2026

HRCA Backcountry Wilderness Half Marathon

Lone Tree, CO

OutsideMarathon

Fri, Nov 6, 2026

Turkey Trails- Denver

Littleton, CO

Outside50 m1 mile5K10K

Sat, Nov 7, 2026

Turkey Trails - Colorado Springs

Colorado Springs, CO

Outside50 m1 mile5K10K

Fri, Nov 13, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Nov 13, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Nov 20, 2026

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

Arvada, CO

OutsideMarathon10K5K1.2 mi

Fri, Nov 27, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Nov 27, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Dec 4, 2026

All-Out Fa La La

Westminster, CO

OutsideMarathon10K5K

Sat, Dec 5, 2026

Rock Canyon Half Marathon- 40th Anniversary Run!

Pueblo, CO

OutsideMarathon5K

Fri, Dec 11, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Dec 11, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Dec 25, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Dec 25, 2026

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Jan 8, 2027

All-Out Polar Prowl

Arvada, CO

OutsideMarathon10K5K

Fri, Jan 15, 2027

ALMAGEDDON Winter Triathlon presented by the Alma Foundation

Alma, CO

Outside12.5 mi

Fri, Jan 15, 2027

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Jan 15, 2027

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Jan 29, 2027

Alley Loop

Crested Butte, CO

OutsideMarathon10K5K1.9 mi

Fri, Jan 29, 2027

Coffee Lover Run DENVER/AURORA

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Jan 29, 2027

Run for Donut DENVER/AURORA

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Feb 5, 2027

All-Out Mardi Crawl

Arvada, CO

OutsideMarathon10K5K

Fri, Feb 5, 2027

Stories Trail Runs

Colorado Springs, CO

Outside6.7 miMarathon19.6 mi

Fri, Feb 12, 2027

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

Centennial, CO

Outside5K10KMarathon1 mile

Fri, Feb 12, 2027

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Feb 13, 2027

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

Colorado Springs, CO

OutsideMarathon5K

Fri, Mar 12, 2027

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, CO

OutsideMarathon2.0 mi

Sat, Mar 13, 2027

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

Severance, CO

Outside5K10K9.3 mi966 m

Fri, Mar 19, 2027

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Mar 20, 2027

All-Out Spring Fever

Golden, CO

OutsideMarathon10K5K

Sat, Mar 20, 2027

Spring Equinox

Wellington, CO

OutsideMarathon5K

Fri, Apr 9, 2027

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

Centennial, CO

Outside5K10KMarathon1 mile

Sat, Apr 10, 2027

Platte River Half-Marathon, Relay & 5k

Littleton, CO

OutsideMarathon5K

Sat, Apr 17, 2027

Horsetooth Half Marathon - Presented by Fort Collins Connexion

Fort Collins, CO

OutsideMarathon

Fri, Apr 23, 2027

All-Out Beat the Heat

Westminster, CO

OutsideMarathon10K5K

Fri, Apr 23, 2027

Bigfoot Half Marathon

Estes Park, CO

OutsideMarathon5K

Fri, Apr 23, 2027

Coffee Lover Run DENVER/AURORA

Centennial, CO

Outside5K10KMarathon1 mile

Sat, May 1, 2027

The Colorado Marathon

Fort Collins, CO

OutsideMarathon10K5K

Sat, Jun 5, 2027

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

Louisville, CO

OutsideMarathon10K5K

Fri, Jun 11, 2027

All-Out Summer Breeze

Arvada, CO

OutsideMarathon10K5K

Fri, Jun 11, 2027

Summits Trail Runs

Granby, CO

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

Wed, Jun 23, 2027

Race in the Clouds - Alma Dirt Festival 2027

Alma, CO

Outside38.0 mi26.0 miMarathon22.0 mi

Fri, Jul 9, 2027

All-Out Dog Days

Westminster, CO

OutsideMarathon10K5K

Fri, Jul 16, 2027

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

Castle Rock, CO

OutsideMarathon10K5K

Thu, Feb 9, 2034

50 States Half Marathon Club General Membership

Colorado Springs, CO

OutsideMarathon

Fri, Feb 10, 2034

Fifty States Half Marathon Club Life Membership

Colorado Springs, CO

OutsideMarathon

Half Marathon races by city in Colorado

Centennial29Colorado Springs7Westminster7Fort Collins6Arvada5Littleton3