September Half Marathons within 100 miles of Lafayette, CO
Featured Listing
1. Boulderthon: Downtown Boulder Marathon
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Sep 28, 2025Sunday
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26.2M, 13.1M, 10K, 5K run | kids run
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Boulder, CO
Boulder County, CO
1. Labor Day Half Marathon
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Sep 1, 2025Monday
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13.1M, 10K, 5K run
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Parker, CO
37 miles point to pointDouglas County, CO
2. Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
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Past DateSep 7, 2024Saturday
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26.2M, 13.1M run
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Denver, CO
18 miles point to pointDenver County, CO
3. All-Out Fall Fest
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Sep 13, 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
11 miles point to pointAdams County, COJefferson County, CO
4. Spooky Sprint
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Sep 13, 2025Saturday
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13.1M, 10K, 5K, 1M run | kids run
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Colorado Springs, CO
81 miles point to pointEl Paso County, CO
5. Nun Run
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Sep 14, 2025Sunday
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13.1M, 5K run
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Denver, CO
18 miles point to pointDenver County, CO
6. Spooky Sprint
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Sep 14, 2025Sunday
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13.1M, 10K, 5K, 1M run | kids run
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Denver, CO
18 miles point to pointDenver County, CO
7. Autumn Run
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Past DateSep 21, 2024Saturday
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26.2M, 13.1M, 10K, 5K run | kids run
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Buena Vista, CO
97 miles point to pointChaffee County, CO
8. Fall Equinox Marathon
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Sep 21, 2025Sunday
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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
41 miles point to pointLarimer County, CO
9. Run the Rockies Half Marathon
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Past DateSep 21, 2024Saturday
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13.1M, 10K run
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Frisco, CO
60 miles point to pointSummit County, CO
10. Prairie Dog Half and 10K/5K
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Sep 27, 2025Saturday
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13.1M, 10K, 5K run | kids run
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Westminster, CO
11 miles point to pointAdams County, COJefferson County, CO
11. Boulderthon: Downtown Boulder Marathon
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Sep 28, 2025Sunday
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26.2M, 13.1M, 10K, 5K run | kids run
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Boulder, CO
10 miles point to pointBoulder County, CO
12. Center of the Nation Series - Day 1
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Sep 29, 2025Monday
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26.2M, 13.1M run
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Cheyenne, WY
80 miles point to pointLaramie County, WY
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.