Big Four Ski Area was an alpine ski area in Washington on the north side of Big Four Mountain, about 26 miles east of Granite Falls. Located in the Stillaguamish River Valley below the ice cave basin, it was associated with the Big Four Mountain Inn, which was first reached by railroad. The ski area opened in the early 19th century and had closed by 1949, before the inn was destroyed by fire that same year. Although little else is recorded about it, the ski area remains a small, poorly documented part of the recreation history of the Big Four Mountain area.