Sawtooth National Forest · Idaho
Greenhorn
8.2 mi of trail, end to end · native material surface · trail No. 7156 · trail class 3 · typical grade 12-20% · tread 18-24 inches wide · hiking, horse, bike, motorcycle, e-bike · motorized use allowed
Trailhead Greenhorn Trailhead Drive there
Greenhorn Trailhead the Forest Service's write-up
Greenhorn Trailhead is one of the busiest motorized trailheads on the Ketchum Ranger District. All designated trails in the Greenhorn drainage are open to singletrack motorized use, including dirtbikes and e-bikes. Area trails are also popular with stock users. Loop opportunities from the trailhead are almost limitless — The map kiosk at the trailhead can help you plan your route. Other amenities at the trailhead include a vault toilet, picnic shelter, and fire ring.
This trailhead on fs.usda.gov
Every trail in Sawtooth National Forest
Other trails from the Greenhorn Trailhead
About this trail's facts
The lines are the US Forest Service's National Forest System trails layer (public domain), read 2026-10-16 and simplified for the map; the length is the line's, end to end, and the class, surface, grade and tread width are the forest's own entries where it publishes them - a forest that publishes the centreline alone has none. The trailheads and the points along the way are the Service's recreation points, and the write-ups its own recarea text, unedited. Heights come from USGS 3DEP through Terrain Tiles on AWS (Mapzen/Tilezen), read along each line and rounded; a short trail on steep ground can be off by a few tens of feet. Closures change: check the forest's own site before you go.
