63-mile point-to-point through Colorado's mining country from mountain start to historic Roundhouse finish
Other trail races within 35 miles
A 100% point-to-point ultramarathon from the Burning Bear Trailhead in Grant to the historic Como Roundhouse, the Silverheels 100K shares its start with the 100-mile and traverses the same high-alpine terrain of Colorado's South Park through mountain passes, wildflower meadows, and historic mining areas. Runners climb to 12,000'+ passes and stay predominantly above 10,000' throughout. With over 10,000 feet of climbing across 63 miles, it's a substantial high-altitude challenge that requires a recent qualifying race for entry.
Experienced ultrarunners
Como, CO, United StatesJuly 10, 2026

Must complete a 50 Mile race or longer within the qualification window
Qualifying window: January 01, 2024 – May 31, 2026
Completion of any official ultramarathon of 50 miles or longer between January 1, 2024 and May 31, 2026. Race must be official (permitted, timed, online results). Virtual, Fat Ass, and journey runs do not qualify.

| Location | Mile | Elevation |
|---|---|---|
Start Start | 0.0 | 9,619 ft |
Finish Finish | 63.4 | 9,806 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
Tent camping available at the race venue near the Como Roundhouse for $20/weekend, benefiting The South Park Rail Society. Check-in available from 2pm Thursday. No roof-top tents or trailers. A porta-potty will be on-site. No running water. Reserve a tent site via RunSignUp during registration or separately at https://runsignup.com/Race/Store/CO/Fairplay/Silverheels100MileEnduranceRun. Nearby towns with lodging: Fairplay (10 mi), Alma (16 mi), Breckenridge (33 mi), Bailey (30 mi).
Average course elevation over 10,000'. Acclimatization recommended.
July monsoon season brings afternoon thunderstorms with lightning on exposed passes.
No required gear specified
No recommended gear specified



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