May Races in Colorado on Sundays
Event Category
Click Here to find out what Classic, Multisport, and Variety mean.
To narrow your search by a distance or event type, you will need to select Classic, Multisport, or Variety first.
To narrow your search by a distance or event type, you will need to select Classic, Multisport, or Variety first.
City Location
1. Altitude Elementary Moose Mudder
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May 5, 2024Sunday
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5K, 1K run
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Aurora, CO
Arapahoe County, CO
2. Colorado Brewery Running Series
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May 5, 2024Sunday
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5K run
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Denver, CO
Denver County, CO
3. Colorado Marathon
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May 5, 2024Sunday
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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
4. Healthy Kids Running Series
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May 5, 2024Sunday
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kids run
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Trinidad, CO
Las Animas County, CO
5. Healthy Kids Running Series - Denver
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May 5, 2024Sunday
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kids run
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Denver, CO
Denver County, CO
6. Healthy Kids Running Series - Aurora
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May 5, 2024Sunday
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kids run
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Aurora, CO
Arapahoe County, CO
7. RMRR Trophy Series - May
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May 5, 2024Sunday
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5M, 5K run
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Denver, CO
Denver County, CO
8. Boulder Mothers Day Run
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May 12, 2024Sunday
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13.1M, 10K, 5K trail run
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Boulder, CO
Boulder County, CO
9. Colorado Women's Classic - Westminster
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May 12, 2024Sunday
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10M, 10K, 5K run | kids run
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Women Only
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Westminster, CO
Adams County, COJefferson County, CO
10. Frank Shorter Track Classic
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May 12, 2024Sunday
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track meet
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Longmont, CO
Boulder County, CO
11. Fruita Trail Half
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May 12, 2024Sunday
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13.1M trail run
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Fruita, CO
Mesa County, CO
12. Head and Neck Cancer A Hard Thing to Swallow 5K/10K
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May 12, 2024Sunday
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10K, 5K run
Virtual OptionMore Information
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Thornton, CO
Adams County, CO
13. Mothers Day 5K
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May 12, 2024Sunday
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5K run
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Denver, CO
Denver County, CO
14. Ordinary Mortals Triathlon
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May 18, 2025Sunday
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sprint triathlon | sprint triathlon relay
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Pueblo, CO
Pueblo County, CO
15. Denver Colfax Marathon
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May 19, 2024Sunday
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26.2M, 13.1M, 10M run | 26.2M relay
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Boston Marathon Qualifier
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Denver, CO
Denver County, CO
16. Healing Warriors Program 5K Fun Run
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May 19, 2024Sunday
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5K run
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Fort Collins, CO
Larimer County, CO
17. Healthy Kids Running Series - Denver
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May 19, 2024Sunday
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kids run
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Denver, CO
Denver County, CO
18. Healthy Kids Running Series - Aurora
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May 19, 2024Sunday
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kids run
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Aurora, CO
Arapahoe County, CO
19. Healthy Kids Running Series - Erie
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May 19, 2024Sunday
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kids run
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Erie, CO
Weld County, CO
20. Miles for Smiles 5K
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May 19, 2024Sunday
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5K run | kids run
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Arvada, CO
Jefferson 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.