Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 75 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

February 2026
Feb
14
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Feb
21-22
Sa - Su

Stories Trail Runs

Trail Run 10 km Half Marathon ... 6 hr 15 hr
Feb
22
Sunday

Mardi Crawl

5 km 10 km Half Marathon
March 2026
Mar
1
Sunday

That Dam Run Half Marathon

5 km 10 km 13 mi
Mar
7
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Mar
14
Saturday

Run Through Time Trail Marathon

Trail Run 2 mi Half Marathon Marathon
Mar
14
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Mar
22
Sunday

All-Out Spring Fever

5 km 10 km Half Marathon
April 2026
Apr
4
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Apr
10-12
Fr - Su

Desert Rats Trail Running Festival

Trail Run 9 km Half Marathon 48 km 100 km
Apr
12
Sunday

Platte River Half-Marathon

Half Marathon
Apr
12
Sunday

Spring Fling Prairie Dog Half Marathon

5 km 10 km 13 mi
Apr
18
Saturday

All-Out Beat the Heat

5 km 10 km Half Marathon
Apr
18
Saturday

Great Western Trail Race

Trail Run 5 km 10 km Half Marathon
Apr
19
Sunday

Horsetooth Half Marathon

Half Marathon
Apr
25
Saturday

Runs With Scissors Races

Half Marathon Marathon 50 km
Apr
25
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
May 2026
May
3
Sunday

Colorado Marathon

5 km 10 km Half Marathon Marathon
May
3
Sunday

The Pilgrimage

Trail Run 7 mi 11 mi 12 mi 13 mi
May
3
Sunday

Longmont Half

5 km Half Marathon
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