1 aid10K Races in Colorado
As of October 6, 2026, Crewable lists 23 upcoming 10K races in Colorado from October 2026 to August 2027. The next is Breckenridge RunFest on October 10 in Breckenridge. Registration is open for 17.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
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Race calendar
October 2026
9 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
10 racesCity Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)
Denver, CO10K5K+1Open until Nov 7from $23Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Nov 14from $30
December 2026
1 raceApril 2027
1 raceMay 2027
1 raceAugust 2027
1 raceQuick answers
What is the next 10K race in Colorado?
Breckenridge RunFest, on Saturday, October 10, 2026, in Breckenridge. Distances: Marathon, Half Marathon, 10K.
How many 10K races in Colorado have open registration?
17 of the 23 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 10K races in Colorado?
November 2026, with 10 of the 23. October 2026 follows with 9.
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