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About RaceIndexOur methodologyData coverageCyclingTriathlon

Lean Horse Ultra Marathon

  • Custer
  • South Dakota
  • Rural
  • 425 runners across the weekend
Data current as of

Official event website ↗

Same event — which distance suits you?

DistanceAscentClimb densityDescentNet elevationMax absolute gradeGAP factor
Ultramarathon1,791 m11.1 m/km1,781 m10 m26.2%1.3%
Relay1,791 m11.1 m/km1,781 m10 m26.2%1.3%

Ultramarathon

Ascent
1,791 m
Climb density
11.1 m/km
Descent
1,781 m
Net elevation
10 m
Max absolute grade
26.2%
GAP factor
1.3%

Relay

Ascent
1,791 m
Climb density
11.1 m/km
Descent
1,781 m
Net elevation
10 m
Max absolute grade
26.2%
GAP factor
1.3%

GAP is modelled energy-cost change versus flat, not a time penalty. Unavailable cells mean no sourced value is available yet. Click a distance for its full page.

Compare distances at this event

Same-event questions

What distances does Lean Horse Ultra Marathon offer?

Lean Horse Ultra Marathon offers Ultramarathon, Relay, all run from the same event.

Typical conditions on race weekend

  • 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.

Explore each distance

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 (3)

Read the full methodology →

Source-backed sections

available route profile, race-day conditions, and source facts are shown on this event page. Sections appear only when their source-backed data is available.