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Marathon Calendar near Boulder 2025-2026

Explore the top marathons near Boulder for 2025-2026! We've gathered 6 exciting races in the area. Check out our detailed list below to find your next local race.

June 2025
Jun
14
Saturday

Estes Park Marathon

5 mi 13 mi 26 mi
August 2025
Aug
2
Saturday

Boulder Rez Marathon

Trail Run 10 km 13 mi 31 km 26 mi
Aug
3
Sunday

Bound for Boston Marathon - Denver

13 mi 26 mi
September 2025
Sep
5-6
Fr - Sa

American Heroes Run

Trail Run 5 km 9 mi ... 100 mi 24 hr
Sep
28
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km 13 mi 26 mi
April 2026
Apr
25
Saturday

Runs With Scissors Races

13 mi 26 mi 50 km
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