Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 90 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

October 2025
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

All-Out Kooky-Spooky

5 km 10 km 13 mi
Nov
2
Sunday

Rim Rock Marathon & Half Marathon

13 mi 26 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
January 2026
Jan
10
Saturday

Polar Prowl

5 km 10 km 13 mi
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