Duck Pass to Mammoth Pass Loop is a 25.9-mile route located outside of Mammoth Lakes, California. It is a challenging yet rewarding and scenic hike or trail run in the Eastern Sierra. Starting at the Duck Pass Trailhead, the route takes you through some of the region's most iconic landscapes, including high alpine passes, pristine lakes, and scenic backcountry trails. The loop combines sections of the Pacific Crest Trail (PCT), Duck Pass Trail, Mammoth Pass Trail, and trails around Horseshoe and Lake Mary, culminating in a full-circle journey back to the Duck Pass Trailhead.
DESCRIPTION
Begin with a climb from the Duck Pass Trailhead near Coldwater Campground. The trail ascends steadily, passing Skelton and Barney Lakes before reaching Duck Pass at 10,800 feet. The view from the pass showcases Duck Lake’s deep blue waters surrounded by rugged peaks.
From Duck Pass, descend and follow the trail along Duck Lake’s northern shore. Continue hiking to reach the PCT, which leads you deeper into the backcountry. The trail alternates between forested sections and open vistas. Stay on the PCT as it winds through picturesque terrain, eventually reaching the Reds Meadow area. This section features diverse scenery, from granite ridges to wooded stretches.
From Reds Meadow, transition to the Mammoth Pass Trail. This stretch leads through volcanic landscapes, including the striking Red Cones, and descends toward the Red Cones Parking Area. From the Red Cones area, follow trails around Horseshoe Lake and continue to Lake Mary before reconnecting to the Duck Pass Trailhead.
FLORA AND FAUNA
The route features diverse flora, including lodgepole pines, wildflowers, and alpine vegetation. Wildlife sightings may include marmots, deer, and various bird species
SAFETY AND CONSIDERATIONS
TRAILHEAD AMENITIES
The Horseshoe Lakes parking area features bathrooms, trash and picnic tables.
PERMIT INFORMATION
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No permits are required for day use.
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Permits are required for overnight camping and backpacking trips and can be obtained at www.recreation.gov.
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Permit quota season is from May 1 - November 1.
WATER
Water along the route can be found from creeks, lakes, and springs and should be treated before consumption.
ADDITIONAL INFORMATION
Mammoth Lakes Welcome Center 1-(760) 924-5500
Wilderness Permit Information 1-(760) 873-2483
Mammoth Lakes Trail Systems: https://www.mammothtrails.org/
Mammoth Lakes Free Mountain Shuttle: https://www.mammothmountain.com/transportation/free-mountain-shuttle
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