Second highest 100-miler in the US — 18,000 ft of climbing through Colorado mining country
Other trail races within 35 miles
A high-altitude point-to-point adventure through Colorado's South Park mining country, the Silverheels 100 Mile starts at the Burning Bear Trailhead in Grant and finishes at the historic Como Roundhouse after traversing 106 non-repetitive miles across two national forests and three ranger districts. Runners navigate singletrack trails and mountain roads at an average elevation of over 10,800', passing through ghost towns, past abandoned mines, and over passes above 12,000' with views of nearly 20 Colorado 14ers. Second highest 100-miler in the US by average elevation (behind only Hardrock 100), this is a demanding qualifier- and volunteer-service-gated event run annually in July's monsoon season with all the lightning, hail, and 30-degree overnight lows that entails.
Experienced ultrarunners
Como, CO, United StatesJuly 10, 2026
Must complete an approved qualifier event within the qualification window
Qualifying window: January 01, 2025 – May 31, 2026
Option 1: Previous completion of any official ultramarathon of at least 100 miles in length at any time. Option 2: Complete any official ultramarathon of 50 miles in length or longer between January 1, 2025 and May 31, 2026. Race must be official (permitted, timed, online results). Virtual, Fat Ass, and journey runs do not qualify.
Eight (8) hours of trail construction/maintenance or race volunteering must be certified by a representative of the organization. Service must be performed between July 1, 2025 and June 30, 2026. Form must be submitted by 11:59:59pm on July 1, 2026. Runners who don't complete the 8 hours may buy-out for $150 during registration.
Qualifying period: July 01, 2025 – June 30, 2026
Submission deadline: July 01, 2026
| Location | Mile | Elevation |
|---|---|---|
Start Start | 0.0 | 9,619 ft |
Finish Finish | 104.0 | 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 10,800'. Acclimatization is strongly recommended before race day.
July is Colorado monsoon season. Afternoon and evening thunderstorms with lightning and hail are common on exposed passes and ridgelines.
Overnight temperatures can drop into the low 30s°F above 10,000'. Mandatory gear check ensures runners carry appropriate layering.
No required gear specified
No recommended gear specified
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