Dark Mountain Trail is a hiking, biking, and horse trail in Larimer County, Colorado. It is within Rocky Mountain National Park. It is 1.7 miles long and begins at 9,095 feet altitude. Traveling the entire trail is 3.4 miles with a total elevation gain of 1,139 feet. The Peregrine Campsite camp site can be seen along the trail. There are also restrooms along the trail.