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Marathon Calendar near Boulder 2026-2027

Monthly updates for Boulder

Get new running races (and updates) in your inbox every month.

Explore the top marathons near Boulder for 2026-2027! We've gathered 5 exciting races in the area. Check out our detailed list below to find your next local race.

April 2026
Apr
25
Sa

Runs With Scissors Races

13 mi 26 mi 50 km
June 2026
Jun
20-21
Sa - Su

Estes Park Marathon

5 km 5 mi Half Marathon Marathon
August 2026
Aug
15
Sa

Boulder Rez Marathon

Trail Run 10 km 13 mi 20 mi 26 mi
September 2026
Sep
11-12
Fr - Sa

American Heroes Run

Trail Run 5 km 9 mi ... 551 min 100 mi
Sep
27
Su

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
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