Devils Thumb, Mountain summit in Snohomish County, Washington, United States

Devils Thumb is a mountain peak in the Mount Baker-Snoqualmie National Forest near Darrington, Washington, distinguished by its striking red-toned rock faces. The summit reaches approximately 5,172 feet above sea level with steep terrain that attracts climbers seeking challenging ascents.

The name Devils Thumb has been officially adopted by the United States Board on Geographic Names. The summit lies on land administered by Mount Baker-Snoqualmie National Forest, 10 miles south of Darrington and 20 miles west of Glacier Peak. Its bedrock records the terranes that built the North Cascades about 50 million years ago.

The name Devils Thumb has been officially adopted by the United States Board on Geographic Names. The peak lies on Mount Baker-Snoqualmie National Forest land, 10 miles south of Darrington and 20 miles west of Glacier Peak, and its summit rises over 2,100 feet above Helena Lake in half a mile.

The summit rises over 2,100 feet above Helena Lake in half a mile, so the final stretch is steep. The south slope drains to Coal Creek and the other slopes to Helena Creek. Snow is wet and heavy, raising avalanche danger in winter; summer often brings clear skies.

The mountain's south-facing slopes feed water into Coal Creek, which joins the Stillaguamish River system. Meanwhile, the opposite sides drain into Helena Creek, creating a natural watershed divide that demonstrates how the peak influences the broader river network.