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Colorado Half Marathon Calendar 2026-2027

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Monthly updates for Colorado

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

Explore the best half marathons in Colorado for 2026-2027! Our updated list features 100 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

September 2026
Sep
19
Sa

Run the Rockies Road Half Marathon

6 mi 13 mi
Sep
19
Sa

Autumn Run - Buena Vista, CO

5 km 10 km Half Marathon
Sep
19-20
Sa - Su

Pikes Peak Marathon

Trail Run 13 mi 26 mi
Sep
19
Sa

Pikes Peak Ascent

Trail Run 13 mi
Sep
25-27
Fr - Su

Red Feather Trail Jamboree

Trail Run Half Marathon 50 km 50 mi
Sep
27
Su

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
October 2026
Oct
3
Sa

Colorado Springs Marathon

5 km Half Marathon Marathon
Oct
3-4
Sa - Su

The Bear Chase

Trail Run 3 mi 6 mi ... 50 mi 62 mi
Oct
4
Su

Windsor Marathon

5 km 10 km Half Marathon Marathon
Oct
10
Sa

The Long View Marathon

5 km Half Marathon Marathon
Oct
11
Su

Westy Half

5 km Half Marathon
Oct
17-18
Sa - Su

Blue Sky Trail Marathon

Trail Run 13 mi 27 mi
November 2026
Nov
1
Su

All-Out Kooky-Spooky

5 km 10 km Half Marathon
Nov
1
Su

Rim Rock Marathon & Half Marathon

13 mi 26 mi
Nov
7
Sa

HRCA Backcountry Wilderness Half Marathon

Trail Run 13 mi
Nov
14
Sa

Louisville Trail Race

Trail Run 3 mi 6 mi 13 mi
Nov
21
Sa

Turkey Trek - Arvada

5 km 10 km 13 mi
Nov
21
Sa

Colorado Cold Rush Ultra

Trail Run 10 km Half Marathon 50 km
December 2026
Dec
5
Sa

All-Out Fa La La

5 km 10 km Half Marathon