Frosty Mountain is a mountain summit located in the Canadian Cascades of southwestern British Columbia, Canada. It is situated south of Lightning Lake, north of the Canada-United States border, and north-northeast of Castle Peak, which is its nearest higher peak. Frosty Mountain is the highest peak in E. C. Manning Provincial Park, and is part of the Hozameen Range which is a subrange of the Cascade Range. It has a lower elevation subsidiary peak known as Frosty Mountain East (2409 m) which is labelled as Frosty Mountain on some maps. The Frosty Mountain name was officially adopted on March 31, 1924, by the Geographical Names Board of Canada. The peak was first climbed on September 2, 1904, by Sledge Tatum and George Loudon Jr., two members of a Boundary Survey group led by Edward C. Barnard. Precipitation runoff from the peak drains into headwaters of Frosty Creek, as well as other tributaries of the Similkameen River.