Cupalo Rock is a 6,593-foot (2,010 m) summit located in Yakima County in Washington state. Cupalo Rock is situated two miles north-northeast of Chinook Pass, one mile east-northeast of Chinook Peak, and barely east of the crest of the Cascade Range. Its nearest higher peak is Three Way Peak, to the west-northwest. Access for climbing Cupalo Rock is normally from the Pacific Crest Trail at Sourdough Gap. Precipitation runoff from Cupalo Rock drains into tributaries of the American River.