May Classic Races within 50 miles of Windsor, CO on Weekends
Westminster, CO
Colorado Women's Classic - Westminster
May 11, 2025
Loveland, CO
New Vision 5K
May 4, 2024
Run For The Trees
May 4, 2024
Run for the Trees - BSBF 2 Mile Run
May 4, 2024
Arvada, CO
Hope House 5K & Fun Run
May 4, 2024
CMRA Tucker Lake 6.5 Mile
May 11, 2024
Miles for Smiles 5K
May 19, 2024
Boulder, CO
Boulder Mothers Day Run
May 12, 2024
South Boulder Creek parkrun
Mar 22, 2025
Mar 29, 2025
Apr 5, 2025
Apr 12, 2025
48 more
Brighton, CO
Adams County Foster Care 5K
May 4, 2024
Firestone, CO
Carbon Valley Half Marathon
May 11, 2024
Keenesburg, CO
We Care Community 5K
May 4, 2024
Fort Collins, CO
Quad Rock 50
May 11, 2024
Healing Warriors Program 5K Fun Run
May 19, 2024
Colorado Marathon
May 4, 2025
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Sat | Sun | Mon | Tue | Wed | Thu | Fri | Multiple |
1. South Boulder Creek parkrun
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May 3, 2025Saturday
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5K run
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Boulder, CO
38 miles point to pointBoulder County, CO
2. 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
34 miles point to pointAdams County, CO
3. Cinco de Mayo 5K
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Past DateMay 4, 2024Saturday
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5K run
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Cheyenne, WY
46 miles point to pointLaramie County, WY
4. 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
12 miles point to pointLarimer County, CO
5. Duck Waddle 5K
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Past DateMay 4, 2024Saturday
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5K run
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Estes Park, CO
34 miles point to pointLarimer County, CO
6. 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
48 miles point to pointJefferson County, CO
7. Longmont Half Marathon
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May 4, 2025Sunday
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13.1M, 5K run
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Longmont, CO
24 miles point to pointBoulder County, CO
8. New Vision 5K
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Past DateMay 4, 2024Saturday
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5K run
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Loveland, CO
11 miles point to pointLarimer County, CO
9. Run For The Trees
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Past DateMay 4, 2024Saturday
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2M run
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Loveland, CO
11 miles point to pointLarimer County, CO
10. Run for the Trees - BSBF 2 Mile Run
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Past DateMay 4, 2024Saturday
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2M run
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Loveland, CO
11 miles point to pointLarimer County, CO
11. We Care Community 5K
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Past DateMay 4, 2024Saturday
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5K run
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Keenesburg, CO
33 miles point to pointWeld County, CO
12. South Boulder Creek parkrun
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May 10, 2025Saturday
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5K run
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Boulder, CO
38 miles point to pointBoulder County, CO
13. Carbon Valley Half Marathon
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Past DateMay 11, 2024Saturday
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13.1M, 5K, 1M run | 13.1M relay | kids run
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Firestone, CO
25 miles point to pointWeld County, CO
14. CMRA Tucker Lake 6.5 Mile
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Past DateMay 11, 2024Saturday
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6.5M run
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Arvada, CO
48 miles point to pointJefferson County, CO
15. Colorado Women's Classic - Westminster
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May 11, 2025Sunday
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10M, 10K, 5K run | kids run
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Women Only
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Westminster, CO
45 miles point to pointAdams County, COJefferson County, CO
16. Quad Rock 50
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Past DateMay 11, 2024Saturday
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50M, 25M trail run
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Fort Collins, CO
12 miles point to pointLarimer County, CO
17. Run Like A Mother 5K
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Past DateMay 11, 2024Saturday
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5K run
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Cheyenne, WY
46 miles point to pointLaramie County, WY
18. Boulder Mothers Day Run
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Past DateMay 12, 2024Sunday
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13.1M, 10K, 5K trail run
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Boulder, CO
38 miles point to pointBoulder County, CO
19. Frank Shorter Track Classic
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Past DateMay 12, 2024Sunday
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track meet
More Information
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Longmont, CO
24 miles point to pointBoulder County, CO
20. Head and Neck Cancer A Hard Thing to Swallow 5K/10K
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Past DateMay 12, 2024Sunday
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10K, 5K run
Virtual OptionMore Information
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Thornton, CO
42 miles point to pointAdams 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.