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Grindstone Trail Running Festival by UTMB Mount Solon, Virginia, United States

Name: Grindstone Trail Running Festival by UTMB
Start: 2027-09-24
End: 2027-09-25

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Grindstone Trail Running Festival by UTMB

Course maps

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HelloDrifter does not warrant the accuracy of this course data; it is provided for informational use only. Verify the course against the event organizer's published materials before relying on it for navigation or safety-critical activities.

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21K
50K
100K
100M

Foot race | 25 Sep 2027

13.5 mi

Distance

Elevation gain

2,431 ft

Elevation high

1,663 ft

Elevation avg

Mixed

Elevation loss

1,335 ft

Elevation low

13%

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 13% over 13.5 mi, which means that the energy expenditure for the run is equivalent to running a flat 15.3 mi.

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 9 Oct 2026

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 2026.

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Grindstone Trail Running Festival by UTMB - 21K course map

Stats summary

Race distance	Distance	Ele gain	Ele loss	Ele avg	Paved	Gravel	Dirt	Narrow
21K	13.5 mi	1,745 ft	1,736 ft	1,663 ft	46%	6%	48%	25%
50K	32.4 mi	5,453 ft	5,449 ft	2,106 ft	20%	52%	28%	60%
100K	65.4 mi	12,815 ft	12,812 ft	2,346 ft	10%	38%	51%	58%
100M	104.6 mi	22,493 ft	22,487 ft	2,648 ft	8%	50%	42%	66%