April Classic Races within 50 miles of Thornton, CO on Weekends
1. South Boulder Creek parkrun
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Apr 5, 2025Saturday
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5K run
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Boulder, CO
19 miles point to pointBoulder County, CO
2. Donut Dash 5K
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Apr 6, 2025Sunday
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5K run
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Denver, CO
9 miles point to pointDenver County, CO
3. Raptor Run
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Past DateApr 6, 2024Saturday
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5K run
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Brighton, CO
12 miles point to pointAdams County, CO
4. Run the Ranch
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Past DateApr 6, 2024Saturday
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12H, 6H, 4H trail run | 12H relay
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Loveland, CO
37 miles point to pointLarimer County, CO
5. RMRR Trophy Series - April
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Past DateApr 7, 2024Sunday
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4M run
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Denver, CO
9 miles point to pointDenver County, CO
6. South Boulder Creek parkrun
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Apr 12, 2025Saturday
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5K run
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Boulder, CO
19 miles point to pointBoulder County, CO
7. Boulder Rez Half
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Past DateApr 13, 2024Saturday
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13.1M, 10K, 5K run
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Boulder, CO
19 miles point to pointBoulder County, CO
8. Horsetooth Half Marathon
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Apr 13, 2025Sunday
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13.1M run
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Fort Collins, CO
50 miles point to pointLarimer County, CO
9. Platte River Half Marathon
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Apr 13, 2025Sunday
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13.1M run | 13.1M relay
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Littleton, CO
18 miles point to pointArapahoe County, CO
10. Spring Fling Prairie Dog Half
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Apr 13, 2025Sunday
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13.1M, 10K, 5K run | kids run
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Arvada, CO
7 miles point to pointJefferson County, CO
11. The Diabetes Link at CU 5K Run/Walk
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Past DateApr 13, 2024Saturday
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5K run
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Boulder, CO
19 miles point to pointBoulder County, CO
12. Three Creeks Half Marathon
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Apr 13, 2025Sunday
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13.1M run
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Denver, CO
9 miles point to pointDenver County, CO
13. Boulder Track Series Meet 1
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Past DateApr 14, 2024Sunday
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track meet
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Longmont, CO
22 miles point to pointBoulder County, CO
14. All-Out Beat the Heat
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Apr 19, 2025Saturday
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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
4 miles point to pointAdams County, COJefferson County, CO
15. South Boulder Creek parkrun
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Apr 19, 2025Saturday
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5K run
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Boulder, CO
19 miles point to pointBoulder County, CO
16. Earth Day 5K/10K
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Past DateApr 20, 2024Saturday
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10K, 5K run | kids run
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Loveland, CO
37 miles point to pointLarimer County, CO
17. Five Star Fun Run and 5K
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Past DateApr 20, 2024Saturday
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5K, 1M run
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Brighton, CO
12 miles point to pointAdams County, CO
18. Great Western Trail Race
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Past DateApr 20, 2024Saturday
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13.1M, 10K, 5K run | kids run
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Severance, CO
46 miles point to pointWeld County, CO
19. The Mile High 4.20K
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TentativeApr 20, 2025Sunday
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4.2K run
Virtual OptionMore Information
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Denver, CO
9 miles point to pointDenver County, CO
20. Time Travel Half Marathon
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Past DateApr 20, 2024Saturday
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13.1M, 10K, 5K run
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Westminster, CO
4 miles point to pointAdams County, COJefferson 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.