Frosty Mountain, a 2,426-metre summit in the Hozameen Range of the Canadian Cascades, is the highest peak in E. C. Manning Provincial Park. Near Lightning Lake and close to the Canada–United States border, it was first recorded as climbed on September 2, 1904, by Sledge Tatum and George Loudon Jr. during a Boundary Survey expedition led by Edward C. Barnard, and its name was officially adopted in 1924. The mountain includes a slightly lower eastern subsidiary summit and is formed of vertically thrusted metasedimentary rock from the ancient Methow Ocean. Its rugged terrain was shaped by tectonic activity, volcanism, and repeated Pleistocene glaciation, while its waters feed tributaries of the Similkameen River.