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Race calendar

Running Races in Boulder, CO

7 upcoming races in and around Boulder. Run This events are listed first — jump to a specific distance below.

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DistanceAll5K10KHalf MarathonUltra
Nearby citiesDenverColorado SpringsCentennialLittletonFort CollinsArvadaWestminsterThorntonPuebloLovelandDurangoGrand Junction

7 races

Wed, Aug 5, 2026

BRR All-Comers Summer Track & Field Series #5

Boulder, CO

Outside100 m200 m400 m800 m

Sat, Sep 12, 2026

Buffalo Bicycle Classic

Boulder, CO

Outside35.0 mi50.0 mi70.0 mi100.0 mi

Sun, Sep 20, 2026

Mountain Lions XC Program

Boulder, CO

Outside

Sat, Sep 26, 2026

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

Boulder, CO

OutsideMarathon5K10K

Wed, Nov 25, 2026

Alpine Bank Boulder Thanksgiving Day 5K

Boulder, CO

Outside5K800 m

Wed, Dec 30, 2026

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

Boulder, CO

Outside5K

Sat, May 1, 2027

Emerge 5K

Boulder, CO

Outside5K

Other cities in Colorado

Denver39Colorado Springs35Centennial32Littleton17Fort Collins16Arvada12Westminster12Thornton9Pueblo8Loveland7Durango6Grand Junction6Bellvue5Louisville5Aurora5Buena Vista5Windsor5Highlands Ranch4Greeley4Steamboat Springs4Golden4Pine3Parker3Pagosa Springs3Palmer Lake3Red Feather Lakes3Salida3Manitou Springs3Estes Park3