Boston Glacier, Largest glacier in North Cascades National Park, Washington, United States
Boston Glacier extends 1.6 kilometers in length and 5.6 kilometers in width, situated beneath mountain peaks including Forbidden Peak and Boston Peak.
The glacier has experienced continuous retreat since 1850, with a brief advancement period between 1950 and 1975, followed by a retreat of 450 meters by 2006.
Scientists regularly monitor Boston Glacier as part of research programs focusing on climate patterns and glacier behavior in the North Cascades region.
Access to Boston Glacier requires obtaining permits from the Wilderness Information Center in Marblemount and preparing for remote mountain conditions without facilities.
The glacier formation creates an extensive icefall at its terminus while forming an arc between Ripsaw Ridge and several surrounding mountain peaks.
Location: Washington
GPS coordinates: 48.50610,-121.03400
Latest update: March 3, 2025 21:27
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