Grindstone by UTMB course maps and aid stations

Registration for 2027 hadn't opened when this page was checked: the organizer's page says it opens soon, and you can sign up there to be notified. Entries can't be refunded or transferred, but every paid entry can be deferred once, for any reason, to the next year. You must be 18 for the 100M, 100K and 50K, and 16 for the 21K. There's no race day registration.

100M entrants must also put in at least 8 hours of trail work during the calendar year of the race and send in the organizer's form. The work can be near home, or you can pay a $225 buyout instead.

Everything happens at Natural Chimneys Park, 94 Natural Chimneys Lane, Mount Solon. Mount Solon is about 20 miles north of Staunton and 22 miles southwest of Harrisonburg. Shenandoah Valley Regional Airport at Weyers Cave has one airline. The organizer says Washington DC and Richmond are each within three hours' drive.

The park's campground has 164 sites, 144 of them with water and electricity, plus showers and a small camp store. Don't camp in the front parking field: the permit forbids it, and you or your runner risk disqualification.

Only the 100M and 100K have crews, and only at North River Gap, Dowells Draft (100M), Camp Todd and the finish. Crew or spectate anywhere else and your runner can be disqualified. Magic Moss has no crew access, so drive past without stopping.

North River Gap is shuttle only: park in the field at Stokesville Church on North River Road and ride the van, which ran every 10 to 15 minutes in 2026, then walk 300 meters. At Dowells Draft you park single file on the shoulder of Braley Pond Road and walk 300 meters past the gate. Camp Todd is on gravel forest roads: drive slowly, and park past the aid station. In 2026 the drive from the park was about 15 minutes to North River Gap, 30 to Dowells Draft and 35 to Camp Todd. Dogs aren't allowed at the crew points.

Pacers are allowed in the 100M only, one at a time. They can join at Dowells Draft (either visit), Camp Todd or North River Gap 2, and must pick up their pacer bib at the expo, since there's no check-in at aid stations.

September in Staunton averages a high of about 77°F and a low of about 56°F (NOAA's 1991 to 2020 normals). The ridges are higher, and the organizer warns that this time of year brings anything from heat to snow on the summits. It can make a hot or cold weather kit mandatory, sometimes only a few days out.

For the 100M the mandatory kit is 1 liter of water capacity, a reusable cup, a running pack, a phone, a hooded jacket, two headlamps with spare batteries, 800 kcal of food, a hat, a whistle and a survival blanket. The 100K needs the same with one headlamp. Trekking poles are allowed in every distance.