Fri, Sep 25, 2026 · 6:00 AM · Red Feather Lakes, CO
Red Feather Trail Jamboree
Half MarathonUltra4,200 ft gain
- Price
- $117.60-$358
- Field size
- 200 · based on the organizer's entry cap
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
Showing 12+ of 13 races · loading the full list…
Sat, Sep 26, 2026 · 7:00 AM · Buena Vista, CO
West Line Winder
30KUltra4,000 ft gain
- Price
- $154.70-$202.40
- Field size
- 500 · based on the organizer's entry cap
Sat, Sep 26, 2026 · 8:00 AM · Telluride, CO
Mountains to the Desert Classic
Ultra
- Price
- Price on registration site
Sat, Sep 26, 2026 · 8:00 AM · Westcliffe, CO
Sangre de Cristo Trail Festival
8M27KUltra
- Price
- $75.20-$394.75
Sun, Sep 27, 2026 · 7:30 AM · Nathrop, CO
Sawatch Ascent
Ultra
- Price
- $191.80
- Field size
- 300 · based on the organizer's entry cap
Sat, Oct 10, 2026 · 7:30 AM · Pine, CO
Suffer Better 10th Annual Fall Trail Runs
5K25KUltra
- Price
- $27.50-$117.60
- Field size
- 198 · based on the organizer's entry cap
Sat, May 1, 2027 · 7:00 AM · Larkspur, CO
Greenland Trail Races
4M8M25KUltra
- Price
- $39.80-$99.20
- Field size
- 185 · based on the organizer's entry cap
Sat, Jun 5, 2027 · 6:00 AM · Eaton, CO
Weld Your Mettle Running Festival
4.3M14MMarathonUltra
- Price
- $38.10-$223.60
Fri, Jun 25, 2027 · 1:30 PM · Alma, CO
Race in the Clouds - Alma Dirt Festival 2027
10KHalf Marathon22MMarathonUltra2,600 ft gain
- Price
- $43.40-$69.90