Kennedy Glacier is located on northwest slopes of Glacier Peak in the U.S. state of Washington. As is true with all the glaciers found on Glacier Peak, Kennedy Glacier is retreating. During the Little Ice Age, Kennedy Glacier extended down to an altitude of and was connected to Scimitar Glacier to the south. From about 1850 to 1952, the glacier lost of its length. During a cooler and wetter period from 1952 to 1984, Kennedy Glacier advanced but between 1984 and 2005, the glacier again retreated, losing of its length.