Grindstone 100 is a 100 miles ultra marathon in Swoope, United States. Distance: 161km. Elevation: 6,700m D+. Difficulty: brutal (Challenge Rating 51/100). DNF rate: 30%. Time limit: 36h. Surface: trail. Established 2004.
Grindstone 100
Swoope, Virginia, United States
"100 miles through Virginia's mountains during peak fall foliage — Appalachian Trail, rocky ridges, and autumn colors."
A Virginia mountain 100-miler timed for peak fall foliage — running the Appalachian Trail through a blaze of autumn color.
The Course
A demanding loop through Virginia's George Washington National Forest and Shenandoah Mountains. The course follows the Appalachian Trail and other mountain paths through dense hardwood forests, rocky ridgelines, and remote backcountry. Fall foliage timing makes this one of the most visually stunning 100s.
mountainous
loop
13
1,370m
Runner Experience
Solid aid station network with 13 stops along the course. Standard ultra fare — food, electrolytes, first aid.
Post-race gathering with awards, food, and shared stories. The ultra community spirit is strong at Grindstone 100.
Race Day Weather
10°C
2° – 18°
70%
35%
October in the Blue Ridge. Cool and pleasant for running. Night temperatures can approach freezing. Peak fall foliage.
Stats & Records
2004
150
30:00:00
17:42:33
John Kelly (2022)
22:08:45
Kathleen Cusick (2023)
Entry
$200
February
months
Lore & Trivia
Grindstone 100 runs through the Appalachian Mountains of Virginia — a relentless, rooty, rocky 100-miler that epitomises East Coast ultra running. The course follows the Blue Ridge and Allegheny mountain trails through dense hardwood forest, crossing dozens of unnamed ridges that blur into one continuous wall of climbing and descending. There are no huge summits, no dramatic views, just endless Appalachian green and the gnarly trail surface that Virginia is famous for. Grindstone attracts runners who find Western mountain hundreds too scenic and not muddy enough. It's the blue-collar hundred-miler: no frills, no tourism, just rocks and roots and suffering.
- ▸ 100 miles through the Appalachian Mountains of Virginia.
- ▸ Relentless climbing over unnamed ridges — the profile is a saw blade.
- ▸ Part of the Grand Slam of 200s series in the US.
- ▸ Rocky, rooty trail surface that punishes every footstrike.
- ▸ Dense hardwood forest means limited views but total immersion.
- ▸ The Blue Ridge parkway sections offer brief relief from the technical trail.
- ▸ October timing means fall colours and cool temperatures — but also early darkness.
Virginia rocks will destroy your feet whether you're winning or dead last. They're democratic like that.
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Frequently Asked Questions
How long is Grindstone 100? +
Grindstone 100 is a 100 miles (161km) ultra marathon with 6,700m of elevation gain. The course is loop on trail terrain.
How hard is Grindstone 100? +
Grindstone 100 is rated brutal with a Challenge Rating of 51/100 (Challenging). The DNF rate is 30%. Runners have 36 hours to finish.
How do I enter Grindstone 100? +
Must have completed a qualifying 100km+ event. Entry costs $200. with a maximum of 250 starters.
What is the weather like at Grindstone 100? +
Average temperature is 10°C (range 2°C to 18°C) with 70% humidity and a 35% chance of rain. October in the Blue Ridge. Cool and pleasant for running. Night temperatures can approach freezing. Peak fall foliage.
Are crew and pacers allowed at Grindstone 100? +
Crew access is allowed. Pacers are allowed after 80km.
What is the course record for Grindstone 100? +
The men's course record is 17:42:33 set by John Kelly in 2022. The women's course record is 22:08:45 set by Kathleen Cusick in 2023.
What is the average finish time for Grindstone 100? +
The average finish time is 30:00:00. About 150 runners finish each year. The DNF rate is 30%.
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