Colorado · 100 Miles
Leadville Trail 100 Run
Leadville Trail 100 Run is a 100 Miles event held in Leadville, Colorado. Its next confirmed date is Saturday, August 21, 2027. About 800 runners take part across all distances.
- Race day
- August 21, 2027
- Location
- Leadville, CO
- Field size
- ~800 runners
Race details
- Date
- Saturday, August 21, 2027
- Location
- Leadville, Colorado
- Distances
- 100 Miles
- Field size
- About 800 runners
- Course
- Brutal high-altitude course, 9,200-12,600 ft, ~15,600 ft total climb over Hope Pass
- Registration
- leadvilleraceseries.com
Registration, course & weather
- Registration status
- Registration status as last checked October 5, 2026: lottery upcoming
- Start time
- 4:00 AM MDT
- Course profile — 100 Mile
- Out-and-back course; Mostly trail, some road
- Course profile — 100 Miles
- Out-and-back course; Trail surface; 13357 ft gain, 13357 ft loss (estimated from third-party elevation data)
About the Leadville Trail 100 Run
One of America's most legendary 100-mile ultramarathons, a high-altitude out-and-back across the Colorado Rockies.
Rankings and notes
- Rankings and awards
- Iconic 'Race Across the Sky' ultramarathon, held annually since 1983
More races in Leadville
More upcoming races in Colorado
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Guides from the RaceRove blog
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- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Leadville Trail 100 Run: common questions
- When is the Leadville Trail 100 Run?
- The next confirmed date is Saturday, August 21, 2027.
- Where is the Leadville Trail 100 Run held?
- In Leadville, Colorado.
- What distances does the Leadville Trail 100 Run offer?
- 100 Miles.
- How many people run the Leadville Trail 100 Run?
- About 800 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Leadville Trail 100 Run?
- Registration is handled by the organiser at leadvilleraceseries.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Leadville Trail 100 Run?
- Registration status as last checked October 5, 2026: lottery upcoming.
- What time does the Leadville Trail 100 Run start?
- 4:00 AM MDT.
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.