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!

May 2025
May
11
Sunday

Donot Stop Half Marathon - Colorado Springs

5 km 10 km 13 mi
May
17-18
Sa - Su

Endure Trail Runs

Backyard Ultra 10 km 13 mi 12 hr 24 hr
May
17-18
Sa - Su

Denver Colfax Marathon

5 km 10 mi 13 mi 26 mi
May
17
Saturday

Vallecito Lake Heavy Half

Trail Run 13 mi
May
25
Sunday

Spirit Trail Run

Trail Run 9 km 21 km 42 km
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
14
Saturday

Barr Lake Trail Race

Trail Run 5 km 15 km ... 30 km 50 km
Jun
15
Sunday

Estes Park Marathon and Half Marathon

5 mi 13 mi 26 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
10-13
Th - Su

Race in the Clouds Dirt Festival

Trail Run 10 km 7 mi 12 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
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