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!

March 2025
Mar
23
Sunday

All-Out Spring Fever

5 km 10 km 13 mi
April 2025
Apr
11-13
Fr - Su

Desert Rats Trail Running Festival

Trail Run 10 km 21 km 50 km 100 km
Apr
12
Saturday

Boulder Rez Half

5 km 10 km 13 mi
Apr
13
Sunday

Spring Fling Prairie Dog Half Marathon

5 km 10 km 13 mi
Apr
13
Sunday

Three Creeks Half Marathon

13 mi
Apr
13
Sunday

Platte River Half-Marathon

13 mi
Apr
13
Sunday

Horsetooth Half Marathon

13 mi
Apr
19
Saturday

All-Out Beat the Heat

5 km 10 km 13 mi
Apr
19
Saturday

Great Western Trail Race

Trail Run 5 km 10 km 13 mi
Apr
26
Saturday

Bigfoot Half Marathon

5 km 13 mi
Apr
26
Saturday

Runs With Scissors Races

13 mi 26 mi 50 km
May 2025
May
3
Saturday

Falcon 50 - Colorado Springs

Trail Run 13 mi 26 mi 50 mi
May
4
Sunday

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
4
Sunday

Longmont Half

5 km 13 mi
May
10
Saturday

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... 26 mi 50 km
May
10-11
Sa - Su

Adventure Fest at 18 Road

Trail Run 21 km 50 km
May
10
Saturday

Mountain Ridge Trail Race

Trail Run 5 km 10 km 13 mi 21 mi
May
10
Saturday

Carbon Valley Half Marathon

5 km 13 mi
May
10
Saturday

Donot Stop Half Marathon - Denver

5 km 10 km 13 mi
May
11
Sunday

Fruita Trail Half Marathon

Trail Run 13 mi
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