Quien Sabe Glacier is a glacier located on the west slopes of Boston Peak, North Cascades National Park in the U.S. state of Washington.

[2] Quien Sabe Glacier retreated 1200 meters from its Little Ice Age maximum in approximately 1850 to 1950.

[3] The glacier then advanced 55 meters between 1955 and 1975.

[3] The glacier is approximately .60 mi (0.97 km) in length, .70 mi (1.13 km) in width at its terminus and descends from 8,400 to 7,200 ft (2,600 to 2,200 m).

This article about a glacier in Washington is a stub.