There are three trailheads that can be used to approach Crosier Mountain. We started at the Rainbow Trailhead, 5.5 miles from Drake, CO. The Crosier Mountain Trail Hike is a strenuous out and back hike that offers beautiful panoramic mountain views from the summit . The hike takes you through wide open meadows (full of wildflowers in the summer), a secluded forest full of lodgepole pine and aspen, and then ends with a steep rocky ascent to the summit. Dogs are allowed on this trail.