Guanella Pass is a scenic alpine pass that offers access to three hiking trails: South Park Trail, Rosalie Trail, and Bierstadt Trail. Vault toilets and ample parking are also provided, but be aware that the summit can be extremely crowded during the summer. Consider accessing Guanella Pass via a nearby trailhead such as South Park or Abyss Lake, though each will require a significant hike.
South Park/Square Top Lakes Trail takes you through beautiful sceneries, as well as ample wildflowers, entirely above treeline. The trail heads south to Hall Valley, intersecting with Geneva Creek Road along the way at the South Park Trailhead. The Rosalie Trail is a popular trail extending from Guanella Pass to the southeast edge of the Mt. Evans Wilderness. It offers a variety of scenery, including spectacular views of Mt. Bierstadt and the glacial cirque on the south side of Mt. Evans. The trail intersects the Abyss Lake, Threemile, and Tanglewood Trails, thus offering interesting extended hikes. Several stretches of the trail are above treeline. The Bierstadt Trail accesses the 14,060 foot summit of Mount Bierstadt. Because this trail is entirely above treeline, you should be alert to the likely development of summer afternoon storms with their accompanying lightening. This trail is rated difficult because of the altitude and elevation gain. Take time to acclimate if coming from low altitude. Be aware that the weather may go rapidly from hot and sunny to cold and snowy, so prepare accordingly. Please respect the sensitive alpine environment and do not step off the trail.
Drive west from Denver on US Hwy 285 for approximately 40 miles to Grant. Turn right (north) on to Park County 62. Drive 13.5 miles to Guanella Pass.