Race Discovery

10K races in Colorado, United States — 2026 trail running calendar

14 events found

Trail Sisters Women's Half Marathon & 10k logo
Sep
12

Trail Sisters Women's Half Marathon & 10k

Buena Vista, Colorado, United States
$65.00 - $100.00
Trail running
Half-Marathon 10K
Pagosa Mountain Chile Cha Cha Trail Races logo
Sep
26

Pagosa Mountain Chile Cha Cha Trail Races

Pagosa Springs, Colorado, United States
$30.00
Trail running
5K 10K
HRCA Wildcat Mountain Trail Races logo
Oct
03

HRCA Wildcat Mountain Trail Races

Littleton, Colorado, United States
$55.00 - $65.00
Trail running
16.1K 10K
Chili Chase logo
Oct
17

Chili Chase

Durango, Colorado, United States
$45.00
Trail running
10.5K
Samson's Revenge
May
22

Samson's Revenge

Estes Park, Colorado, United States
$112.00 - $160.00
Trail running
10.5K 25K Ultra
Summits Trail Runs logo
Jun
12

Summits Trail Runs

Granby, Colorado, United States
$60.00 - $130.00
Trail running
Elevation Challenge (14-hr) 9.8K 22.4K 44.7K +1
Race in the Clouds - Alma Dirt Festival logo
Jun
24

Race in the Clouds - Alma Dirt Festival

Alma, Colorado, United States
Free - $90.00
Running Mountain biking Duathlon Trail running
Weekend Camping FREE Kids Mountain Bike and Trail Run Ultra Marathon +7
The Cheyenne Mountain Run logo
Aug
15

The Cheyenne Mountain Run

Colorado Springs, Colorado, United States
Trail running
5K 10K 22.5K
Into the Hills Eltuck 10k logo
Aug
11

Into the Hills Eltuck 10k

Bellvue, Colorado, United States
Trail running
10K
Audi Power of Four Trail Run logo
Jul
18

Audi Power of Four Trail Run

Aspen, Colorado, United States
Trail running
49.9K 24.1K 10K
The Sunlight Showdown logo
Jun
27

The Sunlight Showdown

Glenwood Springs, Colorado, United States
$100.00
Trail running
5K 10K Half-Marathon
Garden of the Gods 10 Mile/10K and Trail Run logo
Jun
14

Garden of the Gods 10 Mile/10K and Trail Run

Colorado Springs, Colorado, United States
Running Trail running
16.1K 10K 4.7K