Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, kilometre by kilometre.
Race-day light
For a 21:15 finish (an estimate) · starting 07:00 10 Sep · headlamp km 103–the finish. Dark means the sun below civil twilight.
Climbs
biggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 2,380m | -15% |
| USGS lidar, 1 m | 2,786m | 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 30 m against USGS 3DEP and counted each rise of 3 m or more, on Oct 25, 2026. The planner still uses the course file.
Conditions typical race-day weather for 10 Sep at the start
Typical = the median of 2016–2025 for 10 Sep ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.
Race almanac the sky on race day
Next race day Fri, Sep 10, 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.
Reviews what runners who have been there say
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About this course
Steph Sulphur Test 100 Mile Relay — 2027 covers 165.6 km (102.9 mi) with 2,380 m (7,807 ft) of elevation gain. That is about 14 m per km of climbing, and 2,379 m of descent. The course tops out at 185 m and bottoms out at 103 m. Race day is 10 September 2027, starting at 07:00; the sun rises at 06:54 and sets at 19:41. Typical race-day weather at the start: a high of 22°C and a low of 14°C, with a 31% 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
- Oct 13, 2026Added to the catalog
Races like this one close in distance, climbing, terrain, altitude, weather and season
- Tuscazoar Endurance Race 100 Miler — 2026Sep · 159 km · 14 m/kmSimilar climbing · Same distance · Same month
- East Fork 100 mi/100K/50K/15 mi 100 Miler — 2026Sep · 162 km · 18 m/km · OHSame distance · Same month · Similar climbing
- Midwest States 100 — 2026Aug · 164 km · 11 m/km · WISimilar weather · Same distance · Similar climbing
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