Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 5:35 finish (an estimate) · starting 7:00 AM Jan 23. Dark means the sun below civil twilight.
Climbs
biggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 2,877ft | +41% |
| USGS lidar, 1 m | 2,042ft | 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 30, 2026. The planner still uses the course file.
Conditions typical race-day weather for Jan 23 at the start
Typical = the median of 2016–2025 for Jan 23 ±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 Sat, Jan 23, 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
Folsom Lake Sweetwater Trail Run Marathon — 2027 covers 26.2 mi (42.2 km) with 2,877 ft of elevation gain. That is about 110 ft per mile of climbing, and 2,881 ft of descent. The course tops out at 571 ft and bottoms out at 466 ft. Race day is January 23, 2027, starting at 7:00 AM; the sun rises at 7:18 AM and sets at 5:15 PM. Typical race-day weather at the start: a high of 57°F and a low of 40°F, with a 39% 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 29, 2026Added to the catalog
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