Winthrop Glacier

Winthrop Glacier is an alpine glacier on the northeastern side of Mount Rainier, covering the slopes with thick ice and dense snow. Its surface displays deep crevasses and intricate ice formations shaped by constant glacial movement.

The glacier formed during the ice ages and has been receding steadily over time. This retreat has accelerated noticeably in recent decades.

The glacier serves as an educational site for researchers studying climate patterns and geological formations in the Cascade Mountain Range.

Visiting requires significant mountaineering experience and preparation due to demanding conditions with crevasses and steep ice fields. Late summer offers the most favorable window for travel, when conditions are drier and safer.

Researchers have maintained measurement stations on the glacier since the 1950s to track changes in ice thickness. These long-term records show how rapidly the ice body is transforming.

Location: Washington

GPS coordinates: 46.87610,-121.74200

Latest update: December 14, 2025 12:23