September Half Marathons in Colorado
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
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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
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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. Bergen Peak Half Marathon
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Sep 14, 2024Saturday
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13.1M trail run
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Evergreen, CO
Jefferson County, CO
9. 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
10. Nun Run
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Sep 15, 2024Sunday
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13.1M, 5K run
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Denver, CO
Denver County, CO
11. Adams Half & 5K
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Past DateSep 17, 2023Sunday
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13.1M, 5K run
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Brighton, CO
Adams County, CO
12. Autumn Run
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Sep 21, 2024Saturday
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26.2M, 13.1M, 10K, 5K run | kids run
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Buena Vista, CO
Chaffee County, CO
13. 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
14. 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
15. Run the Rockies Half Marathon
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Sep 21, 2024Saturday
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13.1M, 10K run
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Frisco, CO
Summit County, CO
16. Snow Mountain Ranch Trail Festival
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Sep 21, 2024Saturday
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50K, 13.1M, 10K, 5K trail run | 26.2M relay
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Granby, CO
Grand County, CO
17. 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
18. 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
19. 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
20. Colorado Springs Marathon
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Sep 28, 2024Saturday
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26.2M, 13.1M, 5K run | kids run
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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.