September Half Marathons in Colorado
Glenwood Springs, CO
Sunlight Showdown
Sep 22, 2024
Denver, CO
Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
Sep 7, 2024
Nun Run
Sep 15, 2024
Colorado Springs, CO
Colorado Springs Marathon
Sep 28, 2024
Parker, CO
Labor Day Half Marathon
Sep 2, 2024
Louisville, CO
Louisville Trail Race
Sep 28, 2024
Nederland, CO
Ned Ned Run
Sep 9, 2023
Aspen, CO
Golden Leaf Half Marathon
Sep 23, 2023
Frisco, CO
Run the Rockies Half Marathon
Sep 21, 2024
Brighton, CO
Adams Half & 5K
Sep 17, 2023
Breckenridge, CO
Breck Crest Mountain Marathon
Sep 3, 2023
Trinidad, CO
The Rad Dirt Fest
Sep 28, 2024
Ridgway, CO
John Wayne Grit Series
Sep 21, 2024
Telluride, CO
Deep Creek Trail Half Marathon
Sep 28, 2024
Bellvue, CO
Black Squirrel Half Marathon
Sep 7, 2024
Sterling, CO
Center of the Nation Series - Day 1
Sep 30, 2024
Beulah, CO
Beulah Challenge
Sep 21, 2024
Fort Collins, CO
Fall Equinox Marathon
Sep 22, 2024
Red Feather Lakes, CO
Red Feather Trail Jamboree
Sep 21, 2024
Sep 20, 2024
Sep 22, 2024
Jamestown, CO
Calarat Challenge Trail Running Festival
Sep 3, 2023
Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
1. Labor Day Half Marathon
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Sep 2, 2024Monday
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13.1M, 10K, 5K run
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Parker, CO
Douglas County, CO
2. Breck Crest Mountain Marathon
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Past DateSep 3, 2023Sunday
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23M, 13.1M, 10K trail run
More Information
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Breckenridge, CO
Summit County, CO
3. Calarat Challenge Trail Running Festival
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Past DateSep 3, 2023Sunday
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13.1M, 10K, 5K trail run | kids run
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Jamestown, CO
Boulder County, CO
4. Black Squirrel Half Marathon
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Sep 7, 2024Saturday
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13.1M trail run
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Bellvue, CO
Larimer County, CO
5. Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
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Sep 7, 2024Saturday
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26.2M, 13.1M run
More Information
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Denver, CO
Denver County, CO
6. Ned Ned Run
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Past DateSep 9, 2023Saturday
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13.1M, 10K, 5K trail run
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Nederland, CO
Boulder County, CO
7. All-Out Fall Fest
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Sep 14, 2024Saturday
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13.1M, 10K, 5K run
Virtual OptionMore Information
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Boston Marathon Qualifier
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Westminster, CO
Adams County, COJefferson County, CO
8. Trail Sisters Women's Half Marathon
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Sep 14, 2024Saturday
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13.1M, 10K trail run
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Buena Vista, CO
Chaffee County, CO
9. Nun Run
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Sep 15, 2024Sunday
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13.1M, 5K, 1M run
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Denver, CO
Denver County, CO
10. Adams Half & 5K
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Past DateSep 17, 2023Sunday
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13.1M, 5K run
More Information
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Brighton, CO
Adams County, CO
11. Autumn Run
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Sep 21, 2024Saturday
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26.2M, 13.1M, 10K, 5K run | kids run
More Information
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Buena Vista, CO
Chaffee County, CO
12. Beulah Challenge
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Sep 21, 2024Saturday
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13.1M, 10K, 5K run
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Beulah, CO
Pueblo County, CO
13. John Wayne Grit Series - Ridgway
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Sep 21, 2024Saturday
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13.1M, 5K trail run
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Ridgway, CO
Ouray County, CO
14. Run the Rockies Half Marathon
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Sep 21, 2024Saturday
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13.1M, 10K run
More Information
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Frisco, CO
Summit County, CO
15. Snow Mountain Ranch Trail Festival
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Sep 21, 2024Saturday
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50K, 13.1M, 10K, 5K trail run | 50K relay
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Granby, CO
Grand County, CO
16. Fall Equinox Marathon
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Sep 22, 2024Sunday
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26.2M, 13.1M, 5M run
Virtual OptionMore Information
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Boston Marathon Qualifier
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Fort Collins, CO
Larimer County, CO
17. Red Feather Trail Jamboree
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Sep 22, 2024Sunday
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13.1M trail run
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Red Feather Lakes, CO
Larimer County, CO
18. Sunlight Showdown
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Sep 22, 2024Sunday
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13.1M trail run
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Glenwood Springs, CO
Garfield County, CO
19. Golden Leaf Half Marathon
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Past DateSep 23, 2023Saturday
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13.1M trail run
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Aspen, CO
Pitkin County, CO
20. Colorado Springs Marathon
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Sep 28, 2024Saturday
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26.2M, 13.1M, 5K run | kids run
More Information
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Colorado Springs, CO
El Paso County, CO
For the love of all that Is good And moisture wicking...
Though we Try To be accurate And On top Of things... Race details can change When we aren't lookin. And once in a while we simply make a mistake.
ALWAYS visit the race's website for the most complete and accurate race information.
ALWAYS visit the race's website for the most complete and accurate race information.