4 aid5K Races in Colorado
As of October 6, 2026, Crewable lists 47 upcoming 5K races in Colorado from October 2026 to May 2027. The next is Fall Foliage Fun Run on October 7 in Salida. Registration is open for 42.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
4 aid
in 4 days
The Long View Marathon
Fort Collins, CO625 ft gain
MarathonHalf Marathon+1
Open until Oct 11from $45
1 aid
4 aidRace calendar
October 2026
33 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
12 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
April 2027
1 raceMay 2027
1 raceQuick answers
What is the next 5K race in Colorado?
Fall Foliage Fun Run, on Wednesday, October 7, 2026, in Salida. Distances: 5K.
How many 5K races in Colorado have open registration?
42 of the 47 list registration as open as of October 6, 2026, including Fall Foliage Fun Run, ASDAsh 5K to Beat Tooth Decay and Breckenridge RunFest.
What is the busiest month for 5K races in Colorado?
October 2026, with 33 of the 47. November 2026 follows with 12.
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