South Dakota · Marathon · 100 Mile · 100 Mile Relay (up to 5 people)
Lean Horse Ultra Marathon
Lean Horse Ultra Marathon is a marathon, 100 Mile, 100 Mile Relay (up to 5 people), 20 Mile and 30 Mile event held in Custer, South Dakota. Its next confirmed date is Saturday, July 31, 2027. About 95 runners take part across all distances.
- Race day
- July 31, 2027
- Location
- Custer, SD
- Field size
- ~95 runners
Race details
- Date
- Saturday, July 31, 2027
- Location
- Custer, South Dakota
- Distances
- Marathon, 100 Mile, 100 Mile Relay (up to 5 people), 20 Mile, 30 Mile, 30 Mile Black Hills CrossFit Edition (Single), 30 Mile Blac
- Field size
- About 95 runners
- Course
- 100 Mile: 7,162 ft total climb (official)
- Registration
- leanhorseultra.com
- Official website
- raceroster.com
Registration, course & weather
- Registration status
- Open
- Start time
- 12:00 PM MDT
- Course profile — 100 Mile
- Out-and-back course; Trail surface; 7162 ft gain (official course data)
- Course profile — 50 Mile
- Out-and-back course; Trail surface; 3269 ft gain (official course data)
- Course profile — 30 Mile
- Out-and-back course; Trail surface; 2582 ft gain (official course data)
- Course profile — 20 Mile
- Out-and-back course; Trail surface; 1908 ft gain (official course data)
About the Lean Horse Ultra Marathon
A 100, 50, 30 and 20 mile out-and-back ultra on the crushed-limestone George S. Mickelson Trail in the Black Hills, starting and finishing in Custer, South Dakota. The 100 mile starts Friday at noon, with the shorter distances on Saturday.
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Guides from the RaceRove blog
- 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.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Lean Horse Ultra Marathon: common questions
- When is the Lean Horse Ultra Marathon?
- The next confirmed date is Saturday, July 31, 2027.
- Where is the Lean Horse Ultra Marathon held?
- In Custer, South Dakota.
- What distances does the Lean Horse Ultra Marathon offer?
- Marathon, 100 Mile, 100 Mile Relay (up to 5 people), 20 Mile, 30 Mile, 30 Mile Black Hills CrossFit Edition (Single) and 30 Mile Blac.
- How many people run the Lean Horse Ultra Marathon?
- About 95 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 Lean Horse Ultra Marathon?
- Registration is handled by the organiser at leanhorseultra.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Lean Horse Ultra Marathon?
- Yes — registration is open.
- What time does the Lean Horse Ultra Marathon start?
- 12:00 PM 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.