Fourmile Winter
USFS trail SNO-105
The route in 3D
Fly this trail over real terrain
USGS and partner elevation data build the terrain, and the US Forest Service centerline draws the route.
4.5 mi · Typical grade 5 to 8%
About 900 ft between the route's high and low points. An estimate from USGS elevation data, computed 2026-07-10; not measured in the field.
Trail facts
- Length
- 4.5 mi mapped
- Grade
- Typical grade 5 to 8% (USFS trail class TG02)
- Surface
- snow
- Designation
- National trail designation
- National forest
- San Juan National Forest
Length is the trail as the Forest Service maps it, not a trip distance. Hike out and back and you will cover it twice; check the shape of the route before you count on the figure.