Ultra marathons in Colorado, United States
94 races
Rock Hawk
Apr 18, 2026 (Sat)
Castle Rock, Colorado, United States
1.1
Rattler Trail Race
Apr 18, 2026 (Sat)
Colorado Springs, Colorado, United States
1.2
$184.55
Cheyenne Mountain Trail Race
Apr 25, 2026 (Sat)
Colorado Spring, Colorado, United States
1.1
Runs with Scissors Races
Apr 25, 2026 (Sat)
Brighton, Colorado, United States
Royal Gorge Groove
Apr 25, 2026 (Sat)
Cañon City, Colorado, United States
1.2
$184.55
Falcon 50
May 2, 2026 (Sat)
Colorado Springs, Colorado, United States
$66.25
Greenland Trail Races
May 2, 2026 (Sat)
Larkspur, Colorado, United States
1
Denver Beer Company 50K Run
May 2, 2026 (Sat)
Denver Beer Co. Olde Town Arvada, Colorado, United States
Collegiate Peaks Trail Run
May 2, 2026 (Sat)
Buena Vista, Colorado, United States
1.9
$173.9
Sunshine Double
May 2-3, 2026 (Sat-Sun)
Winter Park, Colorado, United States
Valkyrie Trail Race
May 9, 2026 (Sat)
Colorado Springs, Colorado, United States
1.2
$184.55
Quad Rock 50
May 9, 2026 (Sat)
Bellvue, Colorado, United States
2.4
Ram Party
May 16, 2026 (Sat)
Colorado Springs, Colorado, United States
1.1 - 2
$179.22 - $216.5
Samson's Revenge
May 16, 2026 (Sat)
Estes Park, Colorado, United States
1.7
$152.6
Endure Trail Runs
May 16, 2026 (Sat)
Florissant, Colorado, United States
Sky Pilots Ouray Backyard Ultra
May 16, 2026 (Sat)
Ouray, Colorado, United States
$184.55
Weld Your Mettle Running Festival
May 23, 2026 (Sat)
Eaton, Colorado, United States
$75 - $250
The Ol' College Try 24 Hour Ultra
May 23, 2026 (Sat)
Denver, Colorado, United States
$103.43 - $163.25
North Fork 50 Mile/50K
May 30, 2026 (Sat)
Buffalo Creek, Colorado, United States
1.1 - 1.8
$195.2 - $216.5
Showing 76 - 94 of 94 events