Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 21:45 finish (an estimate) · starting 7:00 AM Sep 4 · headlamp mi 60–the finish. Dark means the sun below civil twilight.
Climbs
18 climbs · 19,219 ft totalbiggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 20,114ft | -21% |
| USGS lidar, 1 m | 25,564ft | reference |
They differ because a GPS file picks up noise on every wiggle and often takes its heights from a coarse terrain model, while lidar maps the ground itself to about a metre. We sampled this route every 98 ft against USGS 3DEP and counted each rise of 10 ft or more, on Oct 24, 2026. The planner still uses the course file.
Conditions typical race-day weather for Sep 4 at the start
Typical = the median of 2016–2025 for Sep 4 ±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 66°F at the start, with a low of 42°.
| Year | Start °F | High point °F | Rain | Wind |
|---|---|---|---|---|
| 2026 Sep 4 | 66°/42° | 50°/25° | 0.30in | 5mph |
Next race day Fri, Sep 3, 2027 · 7:00 AM start
First and last light are civil twilight, the sun 6° below the horizon. The moon is lit as at midnight after the start; headlamp hours count a typical finish from the start while the sun is below civil twilight. Worked out for the start line.
race-day weather from the Open-Meteo historical archive (ERA5) at the start line and the course high point (5,732 ft).
Reviews what runners who have been there say
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About this course
Dark Divide Trail Races 100 Miler — 2026 covers 99.5 mi (160.2 km) with 20,114 ft of elevation gain through Washington, United States. That is about 202 ft per mile of climbing, and 20,114 ft of descent. The course tops out at 5,732 ft and bottoms out at 1,319 ft. The surface is 77% trail, 22% gravel and 1% paved. The profile has 18 sustained climbs; the biggest is the climb from mi 4.3, +3,251 ft over 5.9 mi at 10.4% on average (steepest stretch 26%). Race day is September 4, 2026, starting at 7:00 AM; the sun rises at 6:32 AM and sets at 7:43 PM. Typical race-day weather at the start: a high of 79°F and a low of 55°F, with a 17% 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
- Jul 29, 2026Added to the catalog
Races like this one close in distance, climbing, terrain, altitude, weather and season
- Jigger Johnson Ultras — 2026Aug · 104 mi · 194 ft/mi · NHMostly trail · Same distance · Similar climbing
- Plain Endurance Runs 100 Miler — 2026Sep · 103 mi · 193 ft/mi · WASame distance · Mostly trail · Similar climbing
- Grindstone by UTMB 100 Miler — 2026Sep · 104 mi · 191 ft/miSimilar weather · Same distance · Similar climbing
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