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.