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Colorado Running Calendar 2026-2027

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Monthly updates for Colorado

Get new running races (and updates) in your inbox every month.

Explore the best running races in Colorado for 2026-2027! Our updated list features 558 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

Half Marathons Marathons Trail Runs Triathlons Fitness Races
February 2027
Feb
28
Su

Highlands Ranch 5k

3 mi
March 2027
Mar
13
Sa

Erin Go Bragh 7.77k

8 km
Mar
13
Sa

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
Mar
21
Su

All-Out Spring Fever

5 km 10 km 13 mi
Mar
28
Su

Central Park 5k

3 mi
April 2027
Apr
4
Su

Donut Dash - Denver

5 km
Apr
8
Th

Desert Rats Trail Running Festival

Trail Run 9 km Half Marathon 48 km 100 km
Apr
11
Su

Platte River Half-Marathon

5 km 13 mi
Apr
11
Su

NoCo Urban Ultra

Trail Run 50 mi 100 mi
Apr
17
Sa

Rattler Trail Race

Trail Run 5 km 10 km 25 km 50 km
Apr
24
Sa

All-Out Beat the Heat

5 km 10 km 13 mi
Apr
25
Su

Unicorn 5k

3 mi
May 2027
May
1
Sa

Greenland Trail Races

Trail Run 4 mi 8 mi 25 km 50 km
May
1
Sa

Take 5 in The Garden

Trail Run 5 km 5 mi 10 mi
May
2
Su

The Pilgrimage

Trail Run 7 mi 11 mi ... 55 mi 220 mi
May
8
Sa

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... Marathon 50 km
May
8
Sa

Quad Rock 50

Trail Run 25 mi 50 mi
September 2027
Sep
18
Sa

Valkyrie Ultra Heptathlon

Multisport
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