Trail running Race Calendar in Colorado, United States

Continental Divide Trail Run

Steamboat Springs, Colorado, United States

29 Aug, 2026 (Sat)

Trail running

8K 25.7K Ultra

Cirque Series - Arapahoe Basin, CO

Keystone, Colorado, United States

05 Sep, 2026 (Sat)

$90.15

Trail running

15.1K

Trail Sisters Women's Half Marathon & 10k

Buena Vista, Colorado, United States

12 Sep, 2026 (Sat)

$65.00 - $100.00

Trail running

Half-Marathon 10K

53rd Annual Imogene Pass Run

Telluride, Colorado, United States

12 Sep, 2026 (Sat)

$130.00

Trail running

27.5K

Red Feather Trail Jamboree

Red Feather Lakes, Colorado, United States

25 Sep, 2026 (Fri) – 27 Sep, 2026

$100.00 - $300.00

Trail running

Ultra Half-Marathon

Mountain Marmot Trail Run presented by Durango Running Company

Durango, Colorado, United States

26 Sep, 2026 (Sat)

$85.00

Trail running

19.3K

OUTLAST COLORADO SPRINGS

Colorado Springs, Colorado, United States

26 Sep, 2026 (Sat)

$90.00

Trail running

29K

West Line Winder

Buena Vista, Colorado, United States

26 Sep, 2026 (Sat)

$125.00 - $165.00

Trail running

Ultra 30K

Sangre de Cristo Trail Festival

Westcliffe, Colorado, United States

26 Sep, 2026 (Sat) – 27 Sep, 2026

$60.00 - $350.00

Trail running

Ultra 12.9K 27K +2

Estes Epic

Estes Park, Colorado, United States

26 Sep, 2026 (Sat) – 27 Sep, 2026

$90.00 - $230.00

Mountain biking, Duathlon, Trail running

49.9K Ultra 24.1K

Sawatch Ascent

Nathrop, Colorado, United States

27 Sep, 2026 (Sun)

$159.00

Trail running

Ultra

HRCA Wildcat Mountain Trail Races

Littleton, Colorado, United States

03 Oct, 2026 (Sat)

$45.00 - $55.00

Trail running

16.1K 10K