Sherman Crater, Active volcanic crater at Mount Baker, Whatcom County, United States.

Sherman Crater is an active volcanic crater on Mount Baker situated at roughly 9,465 feet between Sherman Peak and Grant Peak. The crater has steep walls surrounding a central lava dome, with fumaroles scattered across its floor that continuously release steam and volcanic gases.

The crater experienced its most recent recorded eruption between September and November 1880. This eruption marked the last major volcanic activity documented at this location on the Cascade Range.

Sherman Crater is named after Sherman Peak, one of the two summits it lies between. Its 1975 activity led to the first extensive modern monitoring campaign at a Cascade volcano, using seismic networks, tiltmeters, temperature measurements and gas sampling. The heat output later settled above pre-1975 levels, and sporadic observations in the 1990s gave way to regular monitoring in the 2000s.

Reaching the crater requires specialized mountaineering gear and official permits from relevant authorities before attempting the climb. The route is technically challenging and best suited for experienced climbers or those joining organized expeditions.

The crater's fumaroles continuously release steam columns that form visible patterns observable from distant viewpoints around the mountain. These steam plumes serve researchers as visible indicators of the site's ongoing thermal and volcanic behavior.