Trail running Race Calendar in Colorado, United States

Summits Trail Runs

Granby, Colorado, United States

06 Jun, 2026 (Sat)

Trail running

9.8K 22.4K 44.7K Ultra

Gold Roots Trail Series

Idaho Springs, Colorado, United States

10 Jun, 2026 (Wed) – 09 Sep, 2026

$27.36

Trail running

6.4K

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

Colorado Springs, Colorado, United States

14 Jun, 2026 (Sun)

$15.00 - $90.00

Running, Trail running

16.1K 10K 4.7K

Sunset Trail Running Festival

Boulder, Colorado, United States

21 Jun, 2026 (Sun)

$20.00 - $75.00

Trail running

28K 12K 5K 1K

Race in the Clouds - Alma Dirt Festival 2026

Alma, Colorado, United States

25 Jun, 2026 (Thu) – 28 Jun, 2026

$10.00 - $150.00

Mountain biking, Duathlon, Trail running

Ultra Marathon Half-Marathon 35.4K +5

The Sunlight Showdown

Glenwood Springs, Colorado, United States

27 Jun, 2026 (Sat) – 19 Sep, 2026

$50.00 - $70.00

Trail running

5K 10K Half-Marathon

Silverheels Trail Runs

Como, Colorado, United States

10 Jul, 2026 (Fri) – 11 Jul, 2026

$80.00 - $385.00

Trail running

Ultra 17.4K 30.7K +2

High Lonesome 100

Nathrop, Colorado, United States

17 Jul, 2026 (Fri) – 18 Jul, 2026

$465.00

Trail running

Ultra

Expedition Maroon Bells

Aspen, Colorado, United States

18 Jul, 2026 (Sat) – 23 Jul, 2026

Free - $735.00

Trail running

45.1K

TransRockies Run Charity Bibs

Buena Vista, Colorado, United States

18 Jul, 2026 (Sat) – 21 Jul, 2026

Free

Trail running

Ultra

Audi Power of Four Trail Run

Aspen, Colorado, United States

18 Jul, 2026 (Sat)

$115.00 - $135.00

Trail running

49.9K 24.1K 10K

14er Challenge

Buena Vista, Colorado, United States

23 Jul, 2026 (Thu) – 25 Jul, 2026

Trail running

40.2K