Senator Henry Jackson of Washington was instrumental in designating many of Washington's wildernesses areas. Here you will find terrain reminiscent of the Swiss Alps attracting mountain climbers: glacial basins surrounded by ragged ridgelines supporting sharp spires and rock towers. Snow often accumulates to a depth of 20 feet and remains well into summer. The melting snow feeds the multiple lakes in the northwest section. Tall forest at lower elevations thins out into broad meadows on ridge tops.
Congress designated the Henry M. Jackson Wilderness in 1984 with 100,356 acres, 74,940 acres in the Mt. Baker-Snoqualmie National Forest. The Henry M. Jackson Wilderness borders Glacier Peak Wilderness to the north and Wild Sky Wilderness to the southwest.