Black Hills National Forest · South Dakota, Wyoming
Trailhead Porcupine Trailhead Drive there
The Porcupine Trail is part of the Beaver Creek Ski Trail system located approximately 17 miles north of Newcastle, WY on highway 85. The Beaver Creek Ski Trail system consists of six trails with a total distance of 12.9 miles. There are several access points to each section of the trail and maps are availability to the public at some of the access points.
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.