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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 329 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
October 2026
Oct
25
Su

Odyssey Odyssey

5 km
Oct-Nov
31-1
Sa - Su

Colorado 24 Hour Run

Backyard Ultra 6 hr 12 hr 24 hr
Oct
31
Sa

Foundry Halloween Run

5 km
Oct
31
Sa

I Ain't Scared 5K

5 km
November 2026
Nov
1
Su

All-Out Kooky-Spooky

5 km 10 km Half Marathon
Nov
1
Su

Rim Rock Marathon & Half Marathon

13 mi 26 mi
Nov
1
Su

RMRR Trophy Series

5 km 15 km
Nov
4
We

Danico Brewing 5K

5 km
Nov
7
Sa

City Park Classic 10k

5 km 10 km
Nov
7
Sa

Kessel Run Ultra

Trail Run 10 mi 20 mi ... 40 mi 50 mi
Nov
7
Sa

HRCA Backcountry Wilderness Half Marathon

Trail Run 13 mi
Nov
14
Sa

Louisville Trail Race

Trail Run 3 mi 6 mi 13 mi
Nov
21
Sa

Turkey Trek - Arvada

5 km 10 km 13 mi
Nov
21
Sa

Pumpkin Pie 10K - Denver

5 km 10 km
Nov
21
Sa

Colorado Cold Rush Ultra

Trail Run 10 km Half Marathon 50 km
Nov
26
Th

Broomfield Turkey Day 10K

5 km 10 km
Nov
26
Th

Parker Parks and Recreation Turkey Day 5K

5 km
Nov
26
Th

Pelican Lakes Turkey Trot

5 km
Nov
26
Th

Buena Vista Turkey Trot 5K

5 km
Nov
26
Th

Mile High United Way Turkey Trot

4 mi