Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 23:10 finish (an estimate) · starting 7:00 AM Sep 19 · headlamp mi 58–the finish. Dark means the sun below civil twilight.
Climbs
18 climbs · 16,680 ft totalbiggest firstAid stations as published on the course file
| Aid station | Mile | km |
|---|---|---|
| A Lick Run Aid Station #1 & #15 | 5.7 | 9.2 |
| A Wolf Ridge Aid Station #2 | 11.5 | 18.6 |
| A Reddish Knob Aid Station #3 | 20.4 | 32.8 |
| A Little Bald Aid Station #4 | 24.3 | 39.1 |
| A North River Gap Aid Station # 5 & #14 | 32.9 | 52.9 |
| A Lookout Mtn Aid Station #6 | 38.6 | 62.1 |
| A Dowells Draft Aid Station #7 | 46.1 | 74.2 |
| A Dry Branch Gap Aid Station #8 & #10 | 52.9 | 85.2 |
| A Cold Springs Aid Station #9 | 59.7 | 96.0 |
| A Magic Moss Aid Station #12 | 77.3 | 124.5 |
| A Camp Todd Aid Station #13 | 82.4 | 132.6 |
| Start/Finish | 104.2 | 167.8 |
Badge colours match the markers on the map above — always confirm locations and cutoffs with the race organizer.
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Conditions typical race-day weather for Sep 19 at the start
Typical = the median of 2016–2025 for Sep 19 ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.
Race almanac 1 year of this race
Past editions
On race day it reached 78°F at the start, with a low of 67°.
| Year | Start °F | High point °F | Rain | Wind |
|---|---|---|---|---|
| 2026 Sep 19 | 78°/67° | 71°/56° | 0.15in | 9mph |
race-day weather from the Open-Meteo historical archive (ERA5) at the start line and the course high point (4,337 ft).
Reviews what runners who have been there say
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About this course
Grindstone by UTMB 100 Miler — 2026 covers 104.2 mi (167.8 km) with 19,931 ft of elevation gain. That is about 191 ft per mile of climbing, and 19,921 ft of descent. The course tops out at 4,341 ft and bottoms out at 1,329 ft. There are 11 aid stations on course; the longest stretch between aid is 21.9 mi. The profile has 18 sustained climbs; the biggest is the climb from mi 79.4, +2,244 ft over 6.0 mi at 7.1% on average (steepest stretch 123%). Race day is September 19, 2026, starting at 7:00 AM; the sun rises at 7:02 AM and sets at 7:20 PM. Typical race-day weather at the start: a high of 79°F and a low of 59°F, with a 27% chance of a wet day. The interactive map above shows the full route with its elevation profile and aid stations, built from the course's GPS file.
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Course history
- Nov 1, 2026Added to the catalog
Races like this one close in distance, climbing, terrain, altitude, weather and season
- Dark Divide Trail Races 100 Miler — 2026Sep · 100 mi · 202 ft/mi · WASimilar weather · Same distance · Similar climbing
- Jigger Johnson Ultras — 2026Aug · 104 mi · 194 ft/mi · NHSame distance · Similar climbing · Similar weather
- Plain Endurance Runs 100 Miler — 2026Sep · 103 mi · 193 ft/mi · WASame distance · Similar climbing · Same month
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