5K races in Colorado, United States — 2026 trail running calendar

Nov

14

Lone Tree Reckoning Half and 5K

Loveland, Colorado, United States

$50.00 - $85.00

Trail running

Half Marathon 5K

May

22

Farish Trail Race

Woodland Park, Colorado, United States

Free - $65.00

Trail running

Half-Marathon 10K 5K 1.6K

Oct

10

Suffer Better 10th Annual Fall Trail Runs

Pine, Colorado, United States

Trail running

Ultra 25K 5K

Oct

04

Rubey Rescue Run

Aspen, Colorado, United States

Trail running

5K

Sep

27

Greenland Open Space Pack Burro Race presented by Double Rainbow Ranch (8 Mile and 3 Mile)

Larkspur, Colorado, United States

Trail running

12.9K 4.8K

Sep

26

Pagosa Mountain Chile Cha Cha Trail Races

Pagosa Springs, Colorado, United States

Trail running

5K 10K

Sep

11

Res Hill Ruck

Pagosa Springs, Colorado, United States

Trail running

5.1K

Aug

18

Into the Hills Eltuck 5k

Bellvue, Colorado, United States

Trail running

5K

Aug

15

The Cheyenne Mountain Run

Colorado Springs, Colorado, United States

Trail running

5K 10K 22.5K

Aug

04

Eltuck Valley 5K - Lory Summer Trail Series

Fort Collins, Colorado, United States

Running

5K

Jul

29

Buff Pass Burner

Steamboat Springs, Colorado, United States

Mountain biking Trail running

8K 4.8K 3.2K 17.7K +5

Jul

01

Howelsen Hustle

Steamboat Springs, Colorado, United States

Mountain biking Trail running

8K 4.8K 1.6K 25.7K +5