355c is a hiking, biking, and horse trail in Boulder County, Colorado. It is within Roosevelt National Forest. It is 1.6 miles long and begins at 8,665 feet altitude. Traveling the entire trail is 3.2 miles with a total elevation gain of 413 feet. The Site 19, Site 6, Site 13, Site 18, and Site 21 camp sites can be seen along the trail. The trail ends near the Site 14 and Site 15 camp sites.