Ruby Peak is a thirteener on the Sierra Crest, north of Mount Mills.

[4] The eastern slope drains into Rock Creek which feeds the Owens River while the western slopes drains in Mono Creek which feeds the South Fork of the San Joaquin River.

The peak's first ascent was prior to 1934 by Norman Clyde via the class 3 East Ridge, and on July 24, 1946, by Fritz Gerstaker and Virginia Whitacre made the first ascent of the class 3 West Couloir route.

A grade IV, class 5.11 route, known as Technical Knockout, ascends Ruby Wall and features a large roof.

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