Upcoming Half Marathons in Colorado

Endurance Grid lists eighty-one half marathons in Colorado, from July 2026 to June 2027 across 31 cities.

81
Races
31
Cities
13
Sports

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Running races in Colorado

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Frequently Asked Questions (FAQs)

How many half marathons are in Colorado?+
Endurance Grid's Race Calendar lists 81 upcoming half marathons in Colorado, in 31 cities, from July 2026 to June 2027.
How long is a half marathon?+
A half marathon is 13.1 miles (21.1 kilometers).
Which Colorado cities host half marathons?+
Half marathons in Colorado are held in Centennial, Colorado Springs, Westminster, Arvada, Fort Collins, Littleton, Buena Vista, Durango, Golden, and Alma, plus 21 other cities.
What other race distances are available in Colorado?+
Beyond half marathon, Colorado races cover a wide range of distances. Colorado also has 5Ks, 10Ks, and marathons for running races. Additionally, Endurance Grid's Race Calendar also covers other sports, with adventure, road cycling, duathlon, gravel, HYROX, mountain bike, paddle, rucking, running, swimrun, trail running, triathlon, and ultra races of various distances.