Marathons in Colorado
As of October 6, 2026, Crewable lists 5 upcoming marathons in Colorado from October 2026 to May 2027. The next is Breckenridge RunFest on October 10 in Breckenridge. Registration is open for 3.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
Race calendar
October 2026
3 racesNovember 2026
1 raceMay 2027
1 raceQuick answers
What is the next marathon in Colorado?
Breckenridge RunFest, on Saturday, October 10, 2026, in Breckenridge. Distances: Marathon, Half Marathon, 10K.
How many marathons in Colorado have open registration?
3 of the 5 list registration as open as of October 6, 2026, including Breckenridge RunFest, The Long View Marathon and Durango Marathon.
What is the busiest month for marathons in Colorado?
October 2026, with 3 of the 5. November 2026 follows with 1.
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