4 aidRaces in Colorado
As of October 6, 2026, Crewable lists 98 upcoming races in Colorado from October 2026 to September 2027. The next is Dirt Pile Race Series on October 6 in Fort Collins. Registration is open for 66. 2 advertise prize money.
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
13 aidin 11 days
Blue Sky Trail Marathon & Half Marathon
Fort Collins, CO3,500 ft gain
MarathonHalf Marathon
Open until Oct 17from $110
1 aidRace calendar
October 2026
57 racesCoffee Lovers Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Oct 10from $30The Roaring Fork Splash for Cash, a fundraiser for the Aspen Swim Club
Aspen, CO0.11 mi relay0.03 miOpen until Oct 10from $75Blue Sky Trail Marathon & Half Marathon
Fort Collins, CO3,500 ft gainMarathonHalf MarathonOpen until Oct 17from $110Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Oct 31from $30
November 2026
19 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
3 racesJanuary 2027
1 raceFebruary 2027
1 raceApril 2027
3 racesMay 2027
6 racesJuly 2027
3 racesThe Summit 200
Frisco, CO
August 2027
3 racesSeptember 2027
2 racesQuick answers
What is the next race in Colorado?
Dirt Pile Race Series, on Tuesday, October 6, 2026, in Fort Collins. Distances: 1.59 mi.
How many races in Colorado have open registration?
66 of the 98 list registration as open as of October 6, 2026, including Fall Foliage Fun Run, ASDAsh 5K to Beat Tooth Decay and Breckenridge RunFest.
Which races in Colorado offer prize money?
2 races advertise prize money, including Rocky's Backyard Ultra ($1,000).
How many of the races in Colorado are ultramarathons?
30 of the 98 are ultramarathons (longer than a marathon, or a backyard, timed or 200+ mile format). The other 68 are shorter races.
What is the busiest month for races in Colorado?
October 2026, with 57 of the 98. November 2026 follows with 19.
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