Diamond Peak Wilderness: Willamette


Image of Diamond Peak Wilderness

Diamond Peak Wilderness straddles the Cascade Mountains. Diamond Peak was formed as the entire land mass of the Cascades was undergoing volcanic activity and uplift. Great glaciers carved the large volcanic peak and when they receded, the bulk of the mountain remained, with snowfields near the summit and dozens of small lakes surrounding the peak.

Lakes are one to 28 acres in size.Diamond Peak Wilderness area covers 52,611 total acres. Approximately 14 miles of the Pacific Crest National Scenic Trail pass through this wilderness. Another 38 miles of trail, including the 10-mile Diamond Peak Trail, stretches the length of the west side of the peak.

Nearly the entire area is covered with mixed stands of mountain hemlock, lodgepole and western white pine, and silver, noble and other true firs.


At a Glance

Permit Info: Self issue entry permits are required between Memorial Day and October 31.
Usage: Medium-Heavy
Water: Always carry water or a way to purify water.
Passes: Some trailheads require a recreation pass.
Information Center: Middle Fork Ranger District

General Information


Access: State Highway 58 to the Pengra Pass trailhead, Hwy 58 to Road 23 and Road 2149, Hwy. 58 to Road 5810 to the Yoran Trailhead. Hwy. 58 to Road 60 to the Whitefish, Fawn Lake and Windy-Oldenburg Trailheads. Hwy. 58 to Road 60 to Road 6010 to the Snell Lake and Summit Lake Trailheads.

General Notes:

For trail information see:

Topo Maps

Cowhorn Mountain, Diamond Peak, Emigrant Butte, Groundhog Mountain, Rigdon Point. Download free U.S. Forest Service Topo maps here.

Buy maps online

Go to the National Forest Store.


Go to Wilderness.net for online maps and other important Wilderness information.


Areas & Activities



  Area/Length : 
52,611 Acres

  Elevation : 
4787 feet - 8744 feet