Colorado Running Calendar 2025-2026

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Explore the best running races in Colorado for 2025-2026! Our updated list features 269 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

February 2026
Feb
21-22
Sa - Su

Stories Trail Runs

Trail Run 10 km 13 mi ... 15 hr 30 hr
Feb
22
Sunday

Highlands Ranch 5k

5 km
Feb
22
Sunday

Mardi Crawl

5 km 10 km 13 mi
March 2026
Mar
14
Saturday

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
Mar
14
Saturday

Erin Go Bragh 7.77k

7 km
Mar
14
Saturday

Sharin' O' The Green

5 km
Mar
22
Sunday

Central Park 5k

5 km
Mar
22
Sunday

All-Out Spring Fever

5 km 10 km 13 mi
April 2026
Apr
10-12
Fr - Su

Desert Rats Trail Running Festival

Trail Run 9 km 21 km 48 km 100 km
Apr
10-11
Fr - Sa

Run The Ranch

Trail Run 5 km 10 km ... 6 hr 12 hr
Apr
12
Sunday

Donut Dash - Denver

5 km
Apr
12
Sunday

Platte River Half-Marathon

13 mi
Apr
18
Saturday

Rattler Trail Race

Trail Run 5 km 10 km 25 km 50 km
Apr
18
Saturday

All-Out Beat the Heat

5 km 10 km 13 mi
Apr
19
Sunday

Horsetooth Half Marathon

13 mi
Apr
25
Saturday

Runs With Scissors Races

13 mi 26 mi 50 km
Apr
26
Sunday

Unicorn 5k

2 mi 5 km
May 2026
May
2
Saturday

Greenland Trail Races

Trail Run 4 mi 8 mi 25 km 50 km
May
2-9
Sa - Sa

Niwot's Challenge

Trail Run 24 mi 50 mi 100 mi
May
2
Saturday

Take 5 in The Garden

Trail Run 5 km 5 mi
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