Lean Horse Ultra Marathon

Friday, 30 July 2027In 280 days

57730, Custer, South Dakota, United Statesleanhorseultra.com

Founded in 2005, the event follows the Mickelson Trail's former railway bed through the Black Hills. The crushed-limestone course has long, gentle climbs, and the programme includes relay and functional-fitness divisions.

Distances for 30 Jul 2027

Entry fee

See organiser for the current course-specific price tier.

Check the latest with the organiser (opens in a new tab)

Rules and terrain

Course: Out and back
Surface: Crushed limestone trail
Cut-off times: First team heat 07:00; subsequent heats every 20 minutes. Finish by 20:00.
Notable segments: Each teammate completes one fitness movement and one running leg; the stated distance is the team course.

Entering

Registration: See organiser for entry availability (opens in a new tab)

Start

100 mile · 100 mile relay (up to 5 runners)·Custer YMCA · 644 Crook Street, Custer, South Dakota
50 mile · 30 mile BHCFE individual (staggered heats) · 30 mile BHCFE team of 3 (staggered heats) · 30 mile BHCFE team of 6 (staggered heats) · 20 mile · 30 mile·Custer Track · 560 Grunewaldt Drive, Custer, SD 57730

Race day

Start time: 07:00 (America/Denver) · 30 mile BHCFE team of 6 (staggered heats) only

Editions

30 Jul 2027
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Where this came from

Sources: https://leanhorseultra.com/course-information/ (opens in a new tab) (archived 19 Oct 2026 (opens in a new tab)) https://leanhorseultra.com/eventschedule/ (opens in a new tab) (archived 19 Oct 2026 (opens in a new tab)) https://leanhorseultra.com/black-hills-crossfit-edition/ (opens in a new tab) (archived 22 Oct 2026 (opens in a new tab)) — 2027 course schedules; Race Roster corroborates edition and MDT
Last verified: 19 Oct 2026