10K Races Near Boulder, CO
As of October 6, 2026, Crewable lists 15 upcoming 10K races near Boulder, CO from October 2026 to August 2027. The next is Breckenridge RunFest on October 10 in Breckenridge, CO. Registration is open for 12.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
Race calendar
October 2026
6 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
6 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 raceMay 2027
1 raceAugust 2027
1 raceQuick answers
What is the next 10K race near Boulder, CO?
Breckenridge RunFest, on Saturday, October 10, 2026, in Breckenridge, CO. Distances: Marathon, Half Marathon, 10K.
What is the closest 10K race to Boulder?
Louisville Trail Race in Louisville, CO, about 8 miles from Boulder, on November 14, 2026.
How many 10K races near Boulder, CO have open registration?
12 of the 15 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 near Boulder, CO?
October 2026, with 6 of the 15. November 2026 follows with 6.
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