Wenatchee National Forest in the context of Methow River

Krummholz /ˈkrʊmˌhoʊlts/ (German: krumm, "crooked, bent, twisted" and Holz, "wood") — also called knieholz ("knee timber") — is a type of stunted, deformed vegetation encountered in the subarctic and subalpine tree line landscapes, shaped by continual exposure to fierce, freezing winds. Under these conditions, trees can survive only where they are sheltered by rock formations or snow cover. As the lower portion of these trees continues to grow, the coverage becomes extremely dense near the ground. In Newfoundland and Labrador, the formation is known as tuckamore. Krummholz trees are also found on beaches, such as the Oregon coast, where trees can become much taller than their subalpine cousins.

The labeling of diverse sets of tree species in different ecological contexts may be problematic. The ecological requirements of krummholz trees in the Alps, for example, are different from those in the Rockies. The terms scrub or shrubland may be more appropriate for some communities with krummholz trees.

Glacier Peak Wilderness is a 566,057-acre (229,075 ha), 35-mile-long (56 km), 20-mile-wide (32 km) wilderness area located within portions of Chelan, Snohomish, and Skagit counties in the North Cascades of Washington. The area lies within parts of Wenatchee National Forest and Mount Baker National Forest and is characterized by heavily forested stream courses, steep-sided valleys, and dramatic glacier-crowned peaks. The dominant geologic feature of the area is 10,541-foot (3,213 m) Glacier Peak. It is the most remote major volcanic peak in the Cascade Range and is the third most heavily glaciated volcano in the lower forty-eight states behind Mount Rainier and Mount Baker. Glacier Peak is a volcanic cone of basalt, pumice, and ash which erupted during periods of heavy glaciation.

The Lake Chelan-Sawtooth Wilderness is a 153,057-acre (61,940 ha) protected wilderness area located within the Okanogan and Wenatchee national forests in Washington State. The wilderness borders Lake Chelan National Recreation Area and North Cascades National Park and the Stephen Mather Wilderness to the northwest. It was designated with the passage of the Washington Wilderness Act of 1984, on lands occupied by the old Chelan Division of the Washington Forest Reserve, now part of both the Okanogan and Wenatchee national forests.

The Henry M. Jackson Wilderness is a 103,297-acre (41,803 ha) designated wilderness area in the state of Washington, United States. The area lies adjacent to the southwest corner of the Glacier Peak Wilderness, northwest of Stevens Pass on U.S. Highway 2 and northeast of the town of Skykomish, Washington. Wild Sky Wilderness is located immediately southwest of the Henry M. Jackson Wilderness. While the wilderness straddles the Cascade Mountain Range, most of it is in the westside ecotype. The wilderness lies in parts of Snoqualmie, Mount Baker, and Wenatchee national forests.