Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 82 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

May 2025
May - Jun
31-1
Sa - Su

Colorado Springs Spartan Event Weekend

Obstacle Run 5 km 10 km 21 km 50 km
June 2025
Jun
1
Sunday

Steamboat Marathon

10 km 13 mi 26 mi
Jun
1
Sunday

Colorado 13er Half Marathon

5 km 10 km 13 mi
Jun
7
Saturday

All-Out Summer Breeze

5 km 10 km 13 mi
Jun
7
Saturday

Steamworks Half Marathon

13 mi
Jun
14
Saturday

Barr Lake Trail Race

Trail Run 5 km 15 km ... 30 km 50 km
Jun
14
Saturday

Estes Park Marathon

5 mi 13 mi 26 mi
Jun
14
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
Jun
21
Saturday

Hometown Half Marathon - Denver

5 km 10 km 13 mi
Jun
21
Saturday

Red, White and Brew Half Marathon

5 km 10 km 13 mi 12 hr
Jun
22
Sunday

Hometown Half Marathon - Colorado Springs

5 km 10 km 13 mi
Jun
28
Saturday

Slacker Half Marathon

4 mi 13 mi
July 2025
Jul
5
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
Jul
10-13
Th - Su

Race in the Clouds Dirt Festival

Trail Run 10 km 7 mi 13 mi
Jul
12
Saturday

All-Out Dog Days

5 km 10 km 13 mi
Jul
19
Saturday

Aspen Valley Marathon

5 km 13 mi 26 mi
Jul
19
Saturday

Summer Splash Prairie Dog Half

5 km 10 km 13 mi
August 2025
Aug
1-2
Fr - Sa

Rocky Mountain Half Marathon

5 km 13 mi
Aug
2
Saturday

Sheep Mountain Ultras

Trail Run 13 mi 50 km 50 mi
Aug
2
Saturday

All-Out Runapalooza

5 km 10 km 13 mi
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