Upcoming Half Marathons in Boulder County, CO on Sundays
1. Calarat Challenge Trail Running Festival
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Sep 1, 2024Sunday
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13.1M, 10K trail run
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Jamestown, CO
Boulder County, CO
2. Boulderthon: Downtown Boulder Marathon
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Sep 29, 2024Sunday
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26.2M, 13.1M, 10K, 5K run | kids run
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Boulder, CO
Boulder County, CO
3. Arctic Prairie Dog Half - Westminster
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Jan 19, 2025Sunday
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13.1M, 10K, 5K run
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Louisville, CO
Boulder County, CO
4. Colorado 13er
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Jun 1, 2025Sunday
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13.1M, 10K, 5K run
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Louisville, CO
Boulder 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.