The Glacier Peak Wilderness, created by the US Forest Service in 1960 by efforts of the North Cascades Conservation Council, four years before the 1964 wilderness legislation of the Congress, is located within portions of Chelan County, Snohomish County, and Skagit Counties in the North Cascades of Washington. The area, 572,000 acres (2,310 km2) in size, 35 miles (56 km) long and 20 miles (32 km) wide, lying within parts of Wenatchee National Forest and Mount Baker National Forest, is characterized by heavily forested stream courses, steep sided valleys, and dramatic glacier-crowned peaks.
Forest vegetation comprises several species of fir, Douglas-fir, hemlock, redcedar as well as stands of mixed pine and Douglas-fir on its eastern slopes. Various species of wildlife inhabit the area and include deer, elk, black bear, mountain goat, Cougar, marten, and lynx. Smaller animals, such as field mice are common. The last confirmed Grizzly Bear sighting in the United States portion of the North Cascade ecosystem occurred in this wilderness. The high mountain lakes often give good catches of fish during their ice-free months. The primary fishery is cutthroat trout, however, other species do exist.