Cape Horn is a mountain summit located in Chelan County of Washington state. Cape Horn is situated west-northwest of Leavenworth, within the Alpine Lakes Wilderness, on land managed by Okanogan-Wenatchee National Forest. Cape Horn is part of the Chiwaukum Mountains, a subset of the Cascade Range. Its nearest higher neighbor is Ladies Peak, to the northwest, and Grindstone Mountain is set to the south. Precipitation runoff from Cape Horn drains west to Icicle Creek, whereas the east slopes drain into Chiwaukum Creek, and both are tributaries of the Wenatchee River. Although modest in elevation, relief is significant since this peak rises over 4,300 feet above Icicle Creek Valley in approximately two miles. This mountain was named by Albert Hale Sylvester in 1909 for its sharp profile.