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MY UTMB

100K

Offering 11,000’ of vertical gain, adventure awaits as you experience some of the most scenic and challenging sections of the 100-mile course in this 100K version of Grindstone by UTMB.

Race Category

ws100KM

Running Stones

3

Finals Access

Distance

62.1 Miles

Elevation Gain

10990 ft+

Start Date

Saturday 20th September 2025

Race Start

Natural Chimneys Park, VA - 06:00

Max Allowed Race Time

18 Hours

Price

$370

Course Description

Course Description

*2025 Courses Coming Soon.

Starting at the historic Natural Chimneys, the 100k course gets you warmed up before tackling a short but steep climb in order to run along the single-track spine of Narrow Back Mtn. Once down the other side you face the monster Wolf Ridge climb where you connect to Timber Ridge turning left and staying left as you crest Sand Spring Mtn and descend on Sand Spring Trail. Take the Tillman forest access to North River Gap and jump on the iconic Wild Oak National Recreation Trail to climb Lookout Mtn and Hankey Mtn before descending the old-school flow of Magic Moss. Follow the North River forest access to Camp Todd where you rejoin the Wild Oak Trail climbing the infamous Horse Trough Hollow, up and over Little Bald Knob, across Chestnut Ridge to Grindstone Mtn and back to North River Gap. Retrace the Tillman forest access to pick up the Tillman Trail climbing back over Narrow back Mtn to Lick Run before exiting the forest at Bear Trap and cruising your way back to the finish in front of the Natural Chimneys.

1

Checkpoint - no assistance permitted

1

Checkpoint with assistance permitted

Services

2624 ft3608 ft4593 ft5.7 M5.7 M11.5 M5.8 M21.2 M9.6 M25.5 M4.2 M31.2 M5.7 M38.4 M7.1 M43.5 M5 M53.5 M10 M61.2 M7.7 M65.6 M4.4 MStartLick Run 1Wolf RidgeSand SpringNorth River Gap 1Lookout MountainMagic MossCamp ToddNorth River Gap 2Lick Run 2FinishG2+3G3+3G4+2G5+4G6+2G7+3G8+3G9+4G10+3StartLick Run 1Wolf RidgeSat 09:00 AMSand SpringSat 11:45 AMNorth River Gap 1Sat 01:00 PMLookout MountainMagic MossSat 04:30 PMCamp ToddSat 06:00 PMNorth River Gap 2Sat 09:00 PMLick Run 2FinishSat 12:00 AM

Mandatory Gear

  • Minimum water supply: 1 liter of hydration capacity
  • Reusable cup/flask/bottle
  • One (1) working headlamp with spare cells/batteries.
  • Recommendation of 200 lumens or more for night running.
  • Jacket with hood for bad weather in the mountains/course terrain.

Recommended Gear

  • Running pack to carry recommended gear throughout the race.
  • Mobile/Cell phone with international roaming that works in the United States of America.
  • Additional working headlamp
  • Hat
Aid Station Chart

Aid Station Chart

Learn more about each Aid Station, elevation gain and loss, cut-off times, and where drop bags and crew are allowed on course

Crew Access Driving Directions

Please review the 100M Crew Access Driving Directions to prepare for race weekend.

DIRECTIONS
Crew Access Driving Directions