Hall Peak is a mountain summit located in the South Fork Stillaguamish River Valley near the western edge of the North Cascades, in Snohomish County of Washington state. It is located northwest of Barlow Pass along the Mountain Loop Highway, near the Monte Cristo area, on land administered by the Mount Baker-Snoqualmie National Forest. Its nearest higher peak is Big Four Mountain, one mile to the south-southwest. Both mountains can be prominently seen from the Big Four picnic area, where the trail to the Big Four Ice Caves starts. The peak is named for mining prospector George Hall, who in 1891, discovered the Forty Five claim.