Course map, elevation profile & surface
Fly the course
Follow the route over 3D terrain, mile by mile.
Race-day light
For a 2:40 finish (an estimate) · starting 7:00 AM Jan 23. Dark means the sun below civil twilight.
Climbs
1 climb · 210 ft totalbiggest firstElevation gain, measured two ways
| Source | Gain | vs lidar |
|---|---|---|
| Course file (GPX) | 1,644ft | +37% |
| USGS lidar, 1 m | 1,203ft | 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 29, 2026. The planner still uses the course file.
Aid stations as published on the course file
| Aid station | Mile | km |
|---|---|---|
| START FINI | 0.0 | 0.1 |
| A PINK RIBBO | 3.6 | 5.8 |
| A 9M Turnaro | 4.5 | 7.2 |
| A YELLOW RIB | 5.3 | 8.6 |
| A 13 MILE TU | 6.2 | 10.0 |
| A AID STATIO | 6.2 | 10.0 |
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 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 1/2 Marathon — 2027 covers 12.5 mi (20.1 km) with 1,644 ft of elevation gain. That is about 132 ft per mile of climbing, and 1,647 ft of descent. The course tops out at 679 ft and bottoms out at 466 ft. There are 5 aid stations on course; the longest stretch between aid is 6.2 mi. The profile has 1 sustained climb; the only one is the climb to YELLOW RIB, +210 ft over 0.5 mi at 8.7% on average (steepest stretch 12%). 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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