Wild and tough.
Hardrock 100 Endurance Run takes place on July 09, 2027 in Silverton, CO.
Hardrock 100 Endurance Run is 98.9 miles with 32,470 ft of elevation gain.
Yes — entry to Hardrock 100 Endurance Run is decided by lottery.
Yes, crew is allowed at Hardrock 100 Endurance Run. Crew can access 7 of the 16 locations listed on this page.
Yes, pacers are allowed at Hardrock 100 Endurance Run. Pacers can be picked up at 5 of the 16 locations listed on this page.
Yes, Hardrock 100 Endurance Run allows drop bags. Drop bags are accepted at 7 of the 16 locations listed on this page.
Hardrock 100 Endurance Run has 14 aid stations along the course.
The overall cutoff for Hardrock 100 Endurance Run is 48h. Individual cutoffs for 9 of the 16 locations listed on this page are published below.
Hardrock 100 Endurance Run has published cutoff times at 9 points on the course. Each one is listed on this page with its location, distance and cutoff.
Other trail races within 62 miles
The San Juan Mountains of southwestern Colorado don't care that you've finished a hundred before. Hardrock is widely regarded as one of the most demanding and awe-inspiring races in the world. It covers 100 miles of genuine alpine wilderness - 33,000+ feet of gain and loss, an average elevation around 11,000 feet, a high point near 14,000 at Handies Peak - through talus fields, lingering snowfields, and exposed ridgelines that demand full presence for every hour of the 48-hour cutoff. There is no cruising through Hardrock.
The race has been quietly building its legend for decades, and the community around it reflects that. The San Juans are remote and staggeringly beautiful in a way that changes what you think a mountain race can feel like. Most people who finish it will tell you it's the hardest thing they've ever done. Most of them entered the lottery again the next day.
Recommended for seasoned ultrarunners
Silverton, CO, United StatesJuly 09, 2027
Hardrock 100 Endurance Run is a loop trail race in Silverton, CO, United States, held on July 09, 2027. The course covers 98.9 miles, climbs 32,470 ft, and has a 48h cutoff.
Two-pool weighted lottery: 'Never Finished' uses 2^N tickets (N = career DNS count); 'Finished' uses cumulative finishes + DNSs. 2026 allocation: 146 starters split 64/82 between pools. RD may select up to 6 Special Consideration picks. Gender equity ensures women ≥ ~22% of starters.
Must complete an approved qualifier event within the qualification window
Find a qualifying raceQualifying period: Through June 15, 2027
Submission deadline: June 21, 2027
Highly technical terrain requiring careful navigation
| Location | Mile | Elevation | Cutoff | Crew | Pacers | Drop bags |
|---|---|---|---|---|---|---|
Silverton Start | 0.0 | 9,308 ft | — | |||
Cunningham Aid Station | 9.3 | 10,377 ft | 4h45m10:45 AM | Crew | Drop Bags | |
Maggie Gulch Aid Station | 15.4 | 11,837 ft | — | |||
Pole Creek Aid Station | 20.4 | 11,243 ft | — | |||
Sherman Aid Station | 29.8 | 9,639 ft | 14h15m8:15 PM | Crew | Drop Bags | |
Burrows Park Aid Station | 34.0 | 10,587 ft | — | |||
Grouse Gulch Aid Station | 43.6 | 10,728 ft | 20h30m2:30 AM +1 | Crew | Pacers | Drop Bags |
Engineer Aid Station | 49.9 | 11,798 ft | — | |||
Ouray Aid Station | 57.9 | 7,677 ft | 27h9:00 AM +1 | Crew | Pacers | Drop Bags |
Governor Basin Aid Station | 65.5 | 10,673 ft | 30h30m12:30 PM +1 | |||
Kroger's Canteen Aid Station | 69.1 | 13,097 ft | — | |||
Telluride Aid Station | 74.0 | 8,747 ft | 34h4:00 PM +1 | Crew | Pacers | Drop Bags |
Chapman Aid Station | 83.7 | 10,157 ft | 38h45m8:45 PM +1 | CrewHike in | Pacers | Drop Bags |
KT Aid Station | 90.3 | 10,627 ft | 42h45m12:45 AM +2 | Pacers | ||
Putnam Basin Aid Station | 95.9 | 11,427 ft | — | |||
Silverton Finish | 101.8 | 9,308 ft | 48h6:00 AM +2 | Crew | Drop Bags |
Aid station details for this race are still being filled in. Cutoffs and access rules come from the race’s own published information and can change — check the official race details before planning around them.
Sign in for race-day weather at every station, points of interest, segment-by-segment analysis, pacing, and to save this race to your calendar.
Pets are not allowed in the main aid station area or on course with runners.
Free community camping for the Hardrock 100 is available at the Kendall Mountain Recreation Area in Silverton, Colorado, which provides room for approximately 180 vehicles and tents. This "Camping Hardrock" option requires pre-registration, which typically opens around Memorial Day each year.
Hardrock occurs in early July in the San Juan Mountains of Colorado, typically during the transition between post-snowmelt calm and the onset of the summer monsoon. Mornings tend to be clear, but intense afternoon thunderstorms build most days as moisture streams in from the south — lightning on exposed ridgelines above 12,000 feet is a genuine hazard, and runners may need to shelter in place for several hours. Temperatures vary dramatically with elevation: the start in Silverton (9,300 ft) can see daytime highs near 70°F (21°C), while the upper passes (12,000–13,000 ft) may drop to near-freezing with 30+ mph winds in the same afternoon. Snow is expected on the course well into July, and runners should plan for wet feet from stream crossings and snowfield traversals — in a typical year, runners have wet feet for 90% or more of the run. Carrying gear for rain, near-freezing temperatures, and high winds at all times is non-negotiable.
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