September Half Marathons within 50 miles of Denver, CO

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All Colorado
Name Open Date Close Date
With Virtual Option
1. Calarat Challenge Trail Running Festival
2. Labor Day Half Marathon
3. Sloan's Lake Search Party (SLSP)! Marathon Hourly Loop Race
4. All-Out Fall Fest
5. Bergen Peak Half Marathon
6. Nun Run
7. Adams Half & 5K
8. Louisville Trail Race
9. Prairie Dog Half and 10K/5K
10. Bear Chase Race - Half Marathon & 10K
11. Boulderthon: Downtown Boulder Marathon

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.