Grindstone by UTMB - 100 Mile - Elevation Profile, Aid Stations and Cutoffs
Grindstone by UTMB - 100 Mile is a 167.4 km (about 104 miles) ultra-trail with around 6,400 m of elevation gain, starting in Natural Chimneys Park, Virginia, USA. The overall cutoff is 36 hours.
Course profile
- Distance
- 167.4 km
- Elevation gain
- 6,400 m
- Elevation loss
- 6,402 m
- Cutoff
- 36h
- Typical winning time
- ~21h48
The biggest climb between checkpoints gains around 920 m from Wolf Ridge (km 18.3) to Reddish Knob (km 32.8). The steepest sustained section on the elevation profile averages about 17% over roughly 2.7 km around km 134. Crew access is allowed at North River Gap 1 (52.1 km), Dowells Draft 1 (73.4 km), Dowells Draft 2 (115.7 km), Camp Todd (132.1 km) and North River Gap 2 (147.7 km). Drop bags are available at North River Gap 1, Dowells Draft 1, Dowells Draft 2, Camp Todd and North River Gap 2.
Data is approximate and courses change between editions - always verify against the official race guide.
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Plan against barriersElevation profile
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~5 weeks · peak ~6 h/week · 5 run + 2 strength days
For a 167.4 km race, aim for about 16 h/week at peak. Set your availability to 18 h/week in the app for the headroom to build there gradually.
Short timeline - the plan focuses on race-specific sharpening and taper rather than base building.
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Aid stations and checkpoints
| Checkpoint | Km | Cumulative gain (m) | Cumulative loss (m) | Cutoff | Crew | Drop bag |
|---|---|---|---|---|---|---|
| Start - Natural Chimneys | 0 | 0 | 0 | - | - | - |
| Lick Run 1 | 9.2 | 230 | 100 | - | No | No |
| Wolf Ridge | 18.3 | 530 | 380 | Fri 21:30 | No | No |
| Reddish Knob | 32.8 | 1,450 | 560 | Sat 00:30 | No | No |
| Little Bald Knob | 39.3 | 1,600 | 770 | - | No | No |
| North River Gap 1 | 52.1 | 1,920 | 1,780 | Sat 04:00 | Yes | Yes |
| Lookout Mountain | 61.3 | 2,400 | 2,000 | - | No | No |
| Dowells Draft 1 | 73.4 | 2,740 | 2,510 | Sat 09:00 | Yes | Yes |
| Dry Branch Gap 1 | 84.7 | 3,410 | 3,000 | Sat 11:00 | No | No |
| Cold Springs | 95.6 | 4,030 | 3,710 | - | No | No |
| Dry Branch Gap 2 | 104.4 | 4,270 | 3,910 | Sat 15:30 | No | No |
| Dowells Draft 2 | 115.7 | 4,760 | 4,560 | Sat 18:00 | Yes | Yes |
| Magic Moss | 124.1 | 5,100 | 4,800 | Sat 20:00 | No | No |
| Camp Todd | 132.1 | 5,180 | 4,870 | Sat 21:30 | Yes | Yes |
| North River Gap 2 | 147.7 | 6,000 | 5,910 | Sun 01:45 | Yes | Yes |
| Lick Run 2 | 160.1 | 6,350 | 6,220 | - | No | No |
| Natural Chimneys (Finish) | 167.4 | 6,400 | 6,402 | Sun 06:00 | Yes | Yes |
Data is approximate and courses change between editions - always verify against the official race guide. Source: official race guide, verified July 17, 2026 - Official race website
FAQ
How much elevation gain does Grindstone by UTMB - 100 Mile have?
Grindstone by UTMB - 100 Mile has around 6,400 m of cumulative elevation gain and 6,402 m of loss over 167.4 km.
What is the cutoff time for Grindstone by UTMB - 100 Mile?
The overall Grindstone by UTMB - 100 Mile cutoff is 36 hours, with intermediate time barriers at major checkpoints. Winning times are typically around 22 hours.
How long is Grindstone by UTMB - 100 Mile?
Grindstone by UTMB - 100 Mile covers approximately 167.4 km (about 104 miles), starting in Natural Chimneys Park, Virginia, USA.
How many aid stations does Grindstone by UTMB - 100 Mile have and which allow crew?
The checkpoint table lists 15 major aid points between the start and the finish. Crew access is allowed at North River Gap 1 (52.1 km), Dowells Draft 1 (73.4 km), Dowells Draft 2 (115.7 km), Camp Todd (132.1 km) and North River Gap 2 (147.7 km). Drop bags are available at North River Gap 1, Dowells Draft 1, Dowells Draft 2, Camp Todd and North River Gap 2.
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