Sholes Glacier is located on the northeast slopes of Mount Baker in the North Cascades of the U.S. state of Washington. The glacier lies on the north side of the ridge known as The Portals. Between 1850 and 1950, Sholes Glacier retreated . During a cooler and wetter period from 1950 to 1979, the glacier advanced but between 1980 and 2006 retreated back .