Trail running Race Calendar in Colorado, United States

Outlast Denver

Littleton, Colorado, United States

03 Oct, 2026 (Sat)

$90.00

Trail running

29K

Rubey Rescue Run

Aspen, Colorado, United States

04 Oct, 2026 (Sun)

$60.38

Trail running

5K

Suffer Better 10th Annual Fall Trail Runs

Pine, Colorado, United States

10 Oct, 2026 (Sat)

$25.00 - $90.00

Trail running

Ultra 25K 5K

Indian Creek Trail Runs

Sedalia, Colorado, United States

17 Oct, 2026 (Sat)

$50.00 - $160.00

Trail running

8.9K 24.1K Ultra

Blue Sky Trail Marathon & Half Marathon

Fort Collins, Colorado, United States

17 Oct, 2026 (Sat) – 18 Oct, 2026

$100.00 - $120.00

Trail running

43K 22.2K

HRCA Backcountry Wilderness Half Marathon

Lone Tree, Colorado, United States

07 Nov, 2026 (Sat)

$65.00

Trail running

Half-Marathon

Sawmill Trail Runs

Pine, Colorado, United States

05 Dec, 2026 (Sat)

$60.00 - $120.00

Trail running

13K 26K Ultra

Stories Trail Runs

Colorado Springs, Colorado, United States

06 Feb, 2027 (Sat) – 07 Feb, 2027

$60.00 - $100.00

Trail running, Running

10.8K Half-Marathon 31.5K

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, Colorado, United States

13 Mar, 2027 (Sat)

Trail running, Running

Marathon Half-Marathon 3.2K

NoCo Urban Ultra & Relay

Bellvue, Colorado, United States

11 Apr, 2027 (Sun)

$105.00 - $150.00

Trail running

Ultra

Emerald Endurance

Steamboat Springs, Colorado, United States

03 Jun, 2026 (Wed)

Mountain biking, Trail running

4.8K 1.6K Half-Marathon 19.3K +6

Weld Your Mettle Running Festival

Eaton, Colorado, United States

30 May, 2026 (Sat) – 31 May, 2026

Trail running, Running

Ultra 6.9K 22.5K Marathon +7