Upcoming Half Marathons in Colorado

Endurance Grid lists ninety-one half marathons in Colorado, from October 2026 to October 2027 across 30 cities.

91
Races
30
Cities
12
Sports

Running races in Colorado

Your next race is out there. Go find it.

All Colorado Running Races

Frequently Asked Questions

How many half marathons are in Colorado?
Endurance Grid's Race Calendar lists 91 upcoming half marathons in Colorado, in 30 cities, from October 2026 to October 2027.
How long is a half marathon?
A half marathon is a running race where athletes run 13.1 miles long (21.1 kilometers) for time.
Which Colorado cities host half marathons?
Half marathons in Colorado are held in Centennial, Colorado Springs, Arvada, Denver, Westminster, Fort Collins, Golden, Littleton, Alma, and Aurora, plus 20 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, trail running, triathlon, and ultra races of various distances.