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Umstead 100 Raleigh, North Carolina, United States

Name: Umstead 100
Start: 2023-04-01
End: 2023-04-01

This has already taken place.Click here to go to the 2025-04-05 event.

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Umstead 100

Course maps

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Route source

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100 Miles

Foot race | 1 Apr 2023 | 7:00 am

161.8 km

Distance

Elevation gain

140 m

Elevation high

109 m

Elevation avg

Trail/Dirt

Elevation loss

70 m

Elevation low

Climb factor

What is climb factor?

The climb factor for a course is the percentage of your energy used in hill-climbing compared to the energy expended running the flats.

This course has a climb factor of 6% over 161.8 km, which means that the energy expenditure for the run is equivalent to running a flat 171.8 km.

Climb factor is provided courtesy of Ben Crowell, who both authored climb factor's scientific paper and wrote the open source software for it. You can read more about it here .

Course last updated 14 Aug 2019

All values approximate

Distance & elevation data

The distance or elevation data not precisely what you expect for this route?

Data from a GPS device can be rough, especially in areas where the terrain (trees, canyons) interfere with GPS signals. And routes drawn on our maps are reliant on people marking trails from satellite images -- the details of which can be hidden by trees.

Elevation can be tricky too. Elevation data is stored on spaced topographical lines, and determining the elevation of a point requires computers to estimate based on how close the point is to the topographical line.

We mitigate this by calculating distance in 3-D (think Pythagorean theorem) and using mathematical techiniques to smooth the elevation data. We come close, but no one can be perfect with imperfect data, even in 2024.

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