Pinnacle Peak, also known as Mount Peak, is an 1,801-foot-elevation forest-covered summit located in King County of Washington state. It is part of the Cascade Range and is set at the western edge of the range, immediately south of Enumclaw, Washington and 25 miles northwest of Mount Rainier. There are two other Washington summits with the same name: Pinnacle Peak in the Tatoosh Range to the south of Mount Rainier, and Pinnacle Peak in North Cascades National Park.