Colorado Marathon Calendar 2025-2026

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Explore the best marathons in Colorado for 2025-2026! Our updated list features 29 exciting races across the state. Find your next race in Colorado below and join the running community at these great events!

September 2025
Sep
20-21
Sa - Su

Pikes Peak Marathon

Trail Run 13 mi 26 mi
Sep
28
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km 13 mi 26 mi
October 2025
Oct
4
Saturday

Colorado Springs Marathon

5 km 13 mi 26 mi
Oct
4
Saturday

West Elk Challenge

Trail Run 26 mi
Oct
5
Sunday

Windsor Marathon

5 km 10 km 13 mi 26 mi
Oct
11
Saturday

The Long View Marathon

5 km 13 mi 26 mi
Oct
11
Saturday

Breckenridge Road Marathon

10 km 13 mi 26 mi
Oct
18-19
Sa - Su

Blue Sky Trail Marathon

Trail Run 13 mi 26 mi
November 2025
Nov
2
Sunday

Rim Rock Marathon & Half Marathon

13 mi 26 mi
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