The Boundary Trail from Pebble Creek Ski Area is a 36-mile loop trail that hovers between 5500 and 7200 feet of elevation. A two-track trail that hugs the National Forest boundary, it affords fantastic views of the Portneuf River valley from multiple directions. The trail is often rough, with loose, fist-sized rocks, with many ascents and descents into creeks that drain Bonneville, Snow, and Haystack Peaks. It is best run in fall, when the colors of the aspens and dwarf maples are at their most vibrant.