in 4 days
The Long View Marathon
Fort Collins, CO625 ft gain
MarathonHalf Marathon+1
Open until Oct 11from $45
Races Near Boulder, CO
As of October 6, 2026, Crewable lists 56 upcoming races near Boulder, CO from October 2026 to September 2027. The next is Dirt Pile Race Series on October 6 in Fort Collins, CO. Registration is open for 40. 2 advertise prize money.
Sources: UltraSignup, RunSignUp, UTMB, race organizers and race websites
With aid station data
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
7 aidRace calendar
October 2026
35 racesCoffee Lovers Run 5K/10K/13.1 DENVER/AURORA
Centennial, COHalf Marathon10K+2Open until Oct 10from $30Blue 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
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
December 2026
3 racesJanuary 2027
1 raceFebruary 2027
1 raceMay 2027
1 raceJuly 2027
1 raceThe Summit 200
Frisco, CO
August 2027
1 raceSeptember 2027
1 raceQuick answers
What is the next race near Boulder, CO?
Dirt Pile Race Series, on Tuesday, October 6, 2026, in Fort Collins, CO. Distances: 1.59 mi.
What is the closest race to Boulder?
Louisville Trail Race in Louisville, CO, about 8 miles from Boulder, on November 14, 2026.
How many races near Boulder, CO have open registration?
40 of the 56 list registration as open as of October 6, 2026, including ASDAsh 5K to Beat Tooth Decay, Breckenridge RunFest and Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA.
Which races near Boulder, CO offer prize money?
2 races advertise prize money, including Rocky's Backyard Ultra ($1,000).
How many of the races near Boulder, CO are ultramarathons?
13 of the 56 are ultramarathons (longer than a marathon, or a backyard, timed or 200+ mile format). The other 43 are shorter races.
What is the busiest month for races near Boulder, CO?
October 2026, with 35 of the 56. November 2026 follows with 12.
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