100mi ultra marathons in Colorado, United States
18 races
Mace's Hideout 100
Jun 7, 2025 (Sat)
Beulah, Colorado, United States
2.2 - 2.9
$482.75
The Great Divide Ultra
Jun 7-8, 2025 (Sat-Sun)
Divide, Colorado, United States
1.3 - 2.9
$163.25 - $333.65
Silverheels Trail Runs
Jul 11-12, 2025 (Fri-Sat)
Fairplay, Colorado, United States
1.7 - 2.7
$180
Hardrock 100 Endurance Run
Jul 11, 2025 (Fri)
Silverton, Colorado, United States
2.7
Ouray 100 Mile Endurance Run
Jul 18, 2025 (Fri)
Ouray, Colorado, United States
2.9
$536
High Lonesome 100
Jul 18, 2025 (Fri)
Chaffee County, Colorado, United States
2.7
Never Summer 100K & 60K
Jul 25-26, 2025 (Fri-Sat)
Gould, Colorado, United States
1.6 - 2.1
Creede 100
Jul 26, 2025 (Sat)
Creede, Colorado, United States
3
$509.37
HighFive100
Aug 8, 2025 (Fri)
Lake City, Colorado, United States
3.1
$0
San Juan Softie 100
Aug 15, 2025 (Fri)
Durango, Colorado, United States
2.9
$429.5
Leadville Trail 100
Aug 16-17, 2025 (Sat-Sun)
Leadville, Colorado, United States
2.4
NoCo Urban Ultra & Relay
Aug 22-23, 2025 (Fri-Sat)
Fort Collins, Colorado, United States
1.7 - 2.5
Rio Grande 100
Aug 23, 2025 (Sat)
South Fork, Colorado, United States
2.8
American Heroes Run
Sep 5-6, 2025 (Fri-Sat)
Longmont, Colorado, United States
2.7
$115.32 - $253.77
Run Rabbit Run
Sep 12-13, 2025 (Fri-Sat)
Steamboat Springs, Colorado, United States
1.7 - 2.5
$386.9 - $615.87
Valkyrie Ultra Heptathlon
Sep 13, 2025 (Sat)
Durango, Colorado, United States
$695.75
Colorado 24 Hour Run
Nov 1, 2025 (Sat)
Fort Collins, Colorado, United States
Weld Your Mettle Running Festival
May 23, 2026 (Sat)
Eaton, Colorado, United States
$75 - $250
Showing 1 - 18 of 18 events