Boulder close

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.

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
May 2026
May
16-17
Sa - Su

Denver Colfax Marathon

10 mi 13 mi 26 mi
Articles
Top 10 Marathons in the Netherlands — The Ultimate Dutch Marathon Bucket List: 10 Unmissable Races
The Beauty of the Easy Run — Why slowing down might be the smartest thing you do for your running
Mizuno Wave Rider 28: Elevating the Legacy of a Running Icon
Garmin Forerunner Review: Garmin Forerunner Series