Ultra marathons in Colorado, United States
94 races
Sawatch Ascent
Sep 28, 2025 (Sun)
Chaffee County, Colorado, United States
1.4
Estes Epic
Sep 28, 2025 (Sun)
Estes Park, Colorado, United States
Rocky's Backyard Ultra Race
Oct 4, 2025 (Sat)
Estes Park, Colorado, United States
$120.65
Hanging Flume 50K
Oct 4, 2025 (Sat)
Montrose County, Colorado, United States
1.2
$131.3
Above the Clouds Ultra
Oct 4, 2025 (Sat)
Woodland Park, Colorado, United States
1.3
$152.6
The Bear Chase
Oct 4-5, 2025 (Sat-Sun)
Lakewood, Colorado, United States
1 - 1.9
$157.92 - $211.17
Castle Rock Trail Festival
Oct 4, 2025 (Sat)
Castle Rock, Colorado, United States
1.2
Taco Bell 50K
Oct 4, 2025 (Sat)
Denver, Colorado, United States
Sage Burner 50K
Oct 11, 2025 (Sat)
Gunnison, Colorado, United States
1.1
$141.95
Suffer Better Trail Runs
Oct 11, 2025 (Sat)
Pine, Colorado, United States
1.3
Rabbit Valley Ultras
Oct 18, 2025 (Sat)
Mack, Colorado, United States
Bobcat Trail Race
Oct 18, 2025 (Sat)
Colorado Springs, Colorado, United States
1.3
$179.22
Indian Creek Trail Runs
Oct 18, 2025 (Sat)
Sedalia, Colorado, United States
1.4 - 1.9
Bridge Burner Ultra
Oct 25, 2025 (Sat)
Cañon City, Colorado, United States
1.2 - 1.5
$157.92 - $168.57
Colorado 24 Hour Run
Nov 1, 2025 (Sat)
Fort Collins, Colorado, United States
Kessel Run Ultra
Nov 8, 2025 (Sat)
Fruita, Colorado, United States
1.5 - 1.9
$184.55 - $221.82
BINGO! Trail Party
Nov 8, 2025 (Sat)
Byers, Colorado, United States
$70
Colorado Cold Rush Ultra
Nov 22, 2025 (Sat)
Colorado Springs, Colorado, United States
1.2
$163.25
Sawmill Trail Runs
Dec 6, 2025 (Sat)
Pine, Colorado, United States
1.1
Thumbs Up Vertical Challenge
Dec 6, 2025 (Sat)
Estes Park, Colorado, United States
Stories Trail Runs
Feb 21-22, 2026 (Sat-Sun)
Colorado Springs, Colorado, United States
Conquer the Rock 25K & 50K
Mar 7, 2026 (Sat)
Pickens, Colorado, United States
RMRR Spring Marathon Training Series #1
Mar 29, 2026 (Sun)
Thornton, Colorado, United States
$60
Run the Ranch
Apr 3-4, 2026 (Fri-Sat)
Loveland, Colorado, United States
Desert RATS Kokopelli 150
Apr 10-11, 2026 (Fri-Sat)
Fruita, Colorado, United States
1.1 - 2.1
Showing 51 - 75 of 94 events