Three Sisters Wilderness: Willamette


Images Three Sister Wilderness Obsidian

Major peaks are: the North, Middle, and South Sisters (all above 10,000'), along with Broken Top, the best example in the Pacific Northwest of the effect of glaciation. Collier Glacier is the largest glacier in Oregon. Other geologic features include Rock Mesa, Collier Cone, and Yapoah Crater. Alpine meadows, waterfalls, lava fields, glaciers, and glacial lakes are abundant. 

Three Sisters Wilderness area covers 281,190 total acres. There are approximately 260 miles of trail within the wilderness. The Pacific Crest National Scenic Trail traverses the wilderness for 40 miles. Most trails entering the wilderness begin in dense forests of Douglas-fir on the western slopes of the Cascades and ponderosa pine on the eastern slopes.

Forests in this wilderness consist mainly of Douglas-fir, silver fir, sub-alpine fir, mountain hemlock, western hemlock, true fir, lodgepole pine, and ponderosa pine. Alpine meadows are abundant.

The Three Sisters Wilderness became part of the National Wilderness Preservation System with the Wilderness Act of 1964. 


At a Glance

Permit Info: Self issue entry permits are required between Memorial Day and October 31. Limited Entry Area Permit required for the Obsidian area
Usage: Heavy
Water: Always carry water or a way to purify water.
Passes: Some trailheads require a recreation pass.
Information Center: McKenzie River Ranger District

General Information


The Three Sisters Wilderness can be accessed by many trailheads on the Willamette National Forest and Deschutes National Forest.

General Notes:

For trail information see:

Close to:

Topo Maps

Belknap Springs, Black Crater, Broken Top, Cougar Reservoir, Crane Prairie, Elk Lake, French Mountain, Harvey Mountain, Irish Mountain, Linnton Lake, Mt. Bachelor, North Sister, Packsaddle Mountain, South Sister, Sunstitute Point, Trout Creek Butte, Tumalo Falls, Waldo Mountain. Download free U.S. Forest Service Topo maps here.

Buy maps online

Go to the National Forest Store. 

Go to for online maps and other important Wilderness information.