Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 92 exciting races across the state. Find your next race in Colorado below and join the running community at these great events!

January 2025
Jan
19
Sunday

Arctic Prairie Dog Half Marathon

5 km 10 km 13 mi
Jan
25
Saturday

Chilly Willy Half Marathon-Colorado Springs

5 km 10 km 13 mi
Jan
26
Sunday

Chilly Willy Half Marathon - Denver

5 km 10 km 13 mi
February 2025
Feb
9
Sunday

Super Half Marathon

5 km 13 mi
Feb
15-16
Sa - Su

Stories Trail Runs

Trail Run 10 km 13 mi ... 15 hr 30 hr
Feb
16
Sunday

Ralston Creek Half Marathon

5 km 13 mi
Feb
22
Saturday

Mardi Crawl

5 km 10 km 13 mi
March 2025
Mar
1
Saturday

Time to Paddy Half Marathon - Denver

5 km 10 km 13 mi
Mar
2
Sunday

Time to Paddy Half Marathon - Colorado Springs

5 km 10 km 13 mi
Mar
2
Sunday

That Dam Run Half Marathon

5 km 10 km 13 mi
Mar
8
Saturday

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
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

Horsetooth Half Marathon

13 mi
Apr
13
Sunday

Three Creeks Half Marathon

13 mi
Apr
13
Sunday

Platte River Half-Marathon

13 mi
Apr
13
Sunday

Spring Fling Prairie Dog Half Marathon

5 km 10 km 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
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