May Classic Races in Colorado
City Location
1. Aspen parkrun
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May 3, 2025Saturday
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5K run
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Aspen, CO
Pitkin County, CO
2. Collegiate Peaks Trail Run
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May 3, 2025Saturday
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50M, 25M trail run
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Buena Vista, CO
Chaffee County, CO
3. Greenland Trail Races
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May 3, 2025Saturday
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50K, 25K, 8M, 4M trail run
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Larkspur, CO
Douglas County, CO
4. Hayden Cog Run
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May 3, 2025Saturday
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8.4M, 5K run
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Hayden, CO
Routt County, CO
5. Nielson Two Mile Challenge
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May 3, 2025Saturday
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2M trail run
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Colorado Springs, CO
El Paso County, CO
6. South Boulder Creek parkrun
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May 3, 2025Saturday
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5K run
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Boulder, CO
Boulder County, CO
7. Take 5 in the Garden
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May 3, 2025Saturday
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5M, 5K run | 9.5M, 5M trail run
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Colorado Springs, CO
El Paso County, CO
8. Adams County Foster Care 5K
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Past DateMay 4, 2024Saturday
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5K, 1M run
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Brighton, CO
Adams County, CO
9. Altitude Elementary Moose Mudder
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May 4, 2025Sunday
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5K, 1K run
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Aurora, CO
Arapahoe County, CO
10. Bash the Bluffs 5K
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Past DateMay 4, 2024Saturday
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5K, 1M run | kids run
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Colorado Springs, CO
El Paso County, CO
11. Colorado Marathon
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May 4, 2025Sunday
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26.2M, 13.1M, 10K, 5K run | 26.2M relay
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Boston Marathon Qualifier
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Fort Collins, CO
Larimer County, CO
12. Duck Waddle 5K
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Past DateMay 4, 2024Saturday
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5K run
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Estes Park, CO
Larimer County, CO
13. Federal Cup 5K
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Past DateMay 4, 2024Saturday
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5K run | kids run
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Lakewood, CO
Jefferson County, CO
14. Ft. Carson Taco Trot
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Past DateMay 4, 2024Saturday
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5K run
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Fort Carson, CO
El Paso County, CO
15. GiGi's 5K
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Past DateMay 4, 2024Saturday
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5K run
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Lakewood, CO
Jefferson County, CO
16. Girls on the Run 5K
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Past DateMay 4, 2024Saturday
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5K run
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Fruita, CO
Mesa County, CO
17. Healthy Kids Running Series - Denver
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May 4, 2025Sunday
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kids run
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Denver, CO
Denver County, CO
18. Hope House 5K & Fun Run
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Past DateMay 4, 2024Saturday
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5K, 1M run
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Arvada, CO
Jefferson County, CO
19. Longmont Half Marathon
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May 4, 2025Sunday
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13.1M, 5K run
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Longmont, CO
Boulder County, CO
20. New Vision 5K
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Past DateMay 4, 2024Saturday
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5K run
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Loveland, CO
Larimer 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.