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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • Relay
  • 160.9 km
  • Custer
  • Event dates –
  • Past event

Lean Horse Ultra Marathon Relay

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2026 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

Modelled energy-cost change 1.3% versus flat · net elevation 10 m

View verified GPS mapOfficial event website ↗
Data current as of

Decision summary

Lean Horse Ultra Marathon Relay at a glance

Route ascent
1,791 m

Lower than 13% of comparable mapped races

Cut-off average pace
11:56/km

32:00:00 total limit divided by distance. Check gun/chip timing and intermediate limits; allow time for stops.

Typical conditions
57/100

Historical race-date favourability, not a forecast

Evidence depth
25 verified facts

Stored GPS route

Quick answers

What runners ask first

Lean Horse Ultra Marathon Relay route map

raceindex.org has a GPS course file for Lean Horse Ultra Marathon Relay, so runners can inspect the route line on the map. Elevation charts and ascent figures appear only when that file includes usable elevation data.

How hilly is the Lean Horse Ultra Marathon Relay?

The Lean Horse Ultra Marathon Relay route has 1,791 m of ascent, 1,781 m of descent and an estimated 1.3% grade-adjusted pace penalty versus a flat route.

Where does the Lean Horse Ultra Marathon Relay route go?

Underfoot, expect crushed limestone (former railroad bed). It passes George S. Mickelson Trail, Black Hills, Hill City and Custer.

What should runners know on race day for the Lean Horse Ultra Marathon Relay?

Pacers allowed on the 100 Mile race for the final 50 miles only; not permitted for shorter distances.

Race character

Scenery

  • Countryside
  • Waterfront
  • Forest
  • Mountain
  • Riverside

Atmosphere

  • Wilderness
  • Scenic Tour
  • Community

Terrain

  • Trail

Entry, logistics and records

Records and field

Field size
Caps: 100 Mile 125, 50 Mile 100, 30 Mile 100, 20 Mile 100, plus Black Hills CrossFit Edition (40 singles, 40 teams of 3, 20 teams of 6)

Entry requirements

Entry status
Past event: The listed edition date has passed.
Cut-off
32:00:00
Qualification status
No qualifying time required to enter; entry is open until distance caps are reached.

Race day logistics

Pacers
Pacers allowed on the 100 Mile race for the final 50 miles only; not permitted for shorter distances.
Medal
Awards for the 20M, 30M, 50M and 100M events are handed out upon finishing.

Course facts

Course type
Out And Back
Surface
Crushed limestone (former railroad bed)
Landmarks
George S. Mickelson Trail, Black Hills, Hill City, Custer
Notable features
  • Billed as one of the best non-technical 100-mile courses in the United States
  • was the 33rd sanctioned 100-mile race in the U.S
  • Aid stations spaced 5 to 8 miles apart
  • each aid station has a permanent bathroom or port-a-potty

How hilly is the Lean Horse Ultra Marathon Relay?

19%57%19%
  • Steep descent 3%
  • Descent 19%
  • Flat 57%
  • Climb 19%
  • Steep climb 3%
Total ascent
1,791 m
Net elevation
+10 m
GAP factor
1.3%
Longest climb
2,480 m at 3.2%
Gradient mix and ascent are derived from the course geometry under our published normalisation, not taken from organiser marketing.

What are typical race-day conditions?

  • 21°CTypical temperature
  • 16 kphTypical wind
  • 3 mmTypical rainfall
  • 57Favourability /100
Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

More race details

Is the Lean Horse Ultra Marathon Relay flat?

Its normalised GAP factor is 1.3% slower than a flat course, with about 1791 m of total ascent.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (2)

Read the full methodology →