Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 92 exciting races across the state. Find your next race in Colorado below and join the running community at these great events!

October 2025
Oct
4
Saturday

Castle Rock Trail Festival

Trail Run 5 km 10 km 13 mi 50 km
Oct
5
Sunday

Windsor Marathon

5 km 10 km 13 mi 26 mi
Oct
11
Saturday

Breckenridge Road Marathon

10 km 13 mi 26 mi
Oct
11
Saturday

The Long View Marathon

5 km 13 mi 26 mi
Oct
12
Sunday

Westy Half

5 km 13 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
Nov
2
Sunday

All-Out Kooky-Spooky

5 km 10 km 13 mi
Nov
8
Saturday

HRCA Backcountry Wilderness Half Marathon

Trail Run 13 mi
Nov
15
Saturday

Louisville Trail Race

Trail Run 5 km 10 km 13 mi
December 2025
Dec
6
Saturday

All-Out Fa La La

5 km 10 km 13 mi
Dec
7
Sunday

Rock Canyon Half Marathon

5 km 13 mi
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