Ultras in Colorado
Every upcoming Ultra race we know about in Colorado. Where a detail isn't confirmed, we mark it unknown rather than guessing.
Race results
Where
When
Showing 19+ of 20 races · loading the full list…
Sep 11, 2026 · 5:00 AM · Idaho Springs, CO
Flaming Foliage Relay - Idaho Springs to Buena Vista
Ultra
- Price
- Price on registration site
Sep 12, 2026 · 8:00 AM · Colorado Springs, CO
Rampart Rager Gravel
Ultra
- Price
- Price on registration site
Sep 23, 2026 · 7:00 PM · Winter Park, CO
CG Adventure Club - Elevation Everest
Ultra
- Price
- Price on registration site
Sep 25, 2026 · 6:00 AM · Red Feather Lakes, CO
Red Feather Trail Jamboree
Half MarathonUltra4,200 ft gain
- Price
- $107-$316
- Field size
- 200 · based on the organizer's entry cap
Sep 26, 2026 · 7:00 AM · Buena Vista, CO
West Line Winder
Ultra4,000 ft gain
- Price
- $133.50-$175.90
- Field size
- 500 · based on the organizer's entry cap
Sep 26, 2026 · 8:00 AM · Telluride, CO
Mountains to the Desert Classic
Ultra
- Price
- Price on registration site
Sep 27, 2026 · 7:30 AM · Nathrop, CO
Sawatch Ascent
Ultra
- Price
- $169.54
- Field size
- 300 · based on the organizer's entry cap
Oct 10, 2026 · 7:30 AM · Pine, CO
Suffer Better 10th Annual Fall Trail Runs
5KUltra
- Price
- $27.50-$96.40
- Field size
- 198 · based on the organizer's entry cap
May 1, 2027 · 7:00 AM · Larkspur, CO
Greenland Trail Races
Ultra
- Price
- $39.80-$99.20
- Field size
- 185 · based on the organizer's entry cap
Jun 24, 2027 · 1:30 PM · Alma, CO
Race in the Clouds - Alma Dirt Festival 2027
10KHalf MarathonMarathonUltra
- Price
- $43.40-$54