Colorado Running calendar 2025-2026

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Explore the best running races in Colorado for 2025-2026! Our updated list features 318 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

May 2025
May
3
Saturday

Take 5 in The Garden

Trail Run 5 km 5 mi
May
3
Saturday

Greenland Trail Races

Trail Run 4 mi 8 mi 25 km 50 km
May
3
Saturday

Collegiate Peaks Trail Run

Trail Run 25 mi 50 mi
May
3
Saturday

Hayden Cog Run

5 km 8 mi
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
4
Sunday

Altitude Elementary Moose Mudder

Obstacle Run 5 km
May
4
Sunday

Fairmount 5k

5 km
May
4
Sunday

RMRR Trophy Series

5 km 5 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

Niwot's Challenge

Trail Run 24 mi 50 mi 100 mi
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

Quad Rock 50

Trail Run 25 mi 50 mi
May
10
Saturday

Ordinary Mortals Triathlon

Triathlon
May
10
Saturday

HRCA Mother's Day 5K

5 km
May
10
Saturday

Colterris Wine Run 5k

5 km
May
10
Saturday

Parker Parks and Recreation Miles over the Meadow Mother's Day 5K

5 km
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