in 4 days
The Long View Marathon
Fort Collins, CO625 ft gain
MarathonHalf Marathon+1
Open until Oct 11from $45
Half Marathons in Colorado
As of October 6, 2026, Crewable lists 19 upcoming half marathons in Colorado from October 2026 to August 2027. The next is Breckenridge RunFest on October 10 in Breckenridge. Registration is open for 15.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
7 aid
3 aid5 aid
Race calendar
October 2026
10 racesCoffee Lovers Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Oct 10from $30Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Oct 31from $30
November 2026
7 racesVeterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Nov 14from $30
May 2027
1 raceAugust 2027
1 raceQuick answers
What is the next half marathon in Colorado?
Breckenridge RunFest, on Saturday, October 10, 2026, in Breckenridge. Distances: Marathon, Half Marathon, 10K.
How many half marathons in Colorado have open registration?
15 of the 19 list registration as open as of October 6, 2026, including Breckenridge RunFest, Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA and Cookie Run 5K/10K/13.1 DENVER/AURORA.
What is the busiest month for half marathons in Colorado?
October 2026, with 10 of the 19. November 2026 follows with 7.
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