Ultra races in Colorado, United States — 2026 running calendar

BRR All-Comers Summer Track & Field Series #1

Boulder, Colorado, United States

11 Jun, 2026 (Thu)

$15.00 - $20.00

Running

Ultra 1.6K 3K +1

Blue Sky Ascent & Round Trip (formerly the Mt. Evans Ascent)

Idaho Springs, Colorado, United States

28 Jun, 2026 (Sun)

$175.00 - $185.00

Running

23.3K 46.7K

BRR All-Comers Summer Track & Field Series #3

Boulder, Colorado, United States

09 Jul, 2026 (Thu)

$20.00

Running

Ultra 1.6K 5K +1

BRR All-Comers Summer Track & Field Series #4

Boulder, Colorado, United States

23 Jul, 2026 (Thu)

Free - $20.00

Running

Ultra 3.2K

World Championship Pack Burro Race

Fairplay, Colorado, United States

26 Jul, 2026 (Sun)

$70.00

Trail running, Running

49.9K 24.1K

BRR All-Comers Summer Track & Field Series #5

Boulder, Colorado, United States

06 Aug, 2026 (Thu)

$20.00

Running

Ultra 1.6K

CG Adventure Club - Elevation Everest

Winter Park, Colorado, United States

23 Sep, 2026 (Wed) – 27 Sep, 2026

$150.00 - $400.00

Running

35.4K Ultra

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

Endure Trail Runs

Divide, Colorado, United States

16 May, 2026 (Sat)

Running, Trail running

11K 22.7K Marathon

Greenland Trail Races

Larkspur, Colorado, United States

02 May, 2026 (Sat)

Trail running, Running

Ultra 25K 12.9K 6.4K +2

The Grand Traverse

Crested Butte, Colorado, United States

29 Mar, 2026 (Sun) – 06 Sep, 2026

$220.00 - $388.00

Skiing, Triathlon, Running, Duathlon, Mountain biking

Ultra +1