Cougar Mountain is a peak in the Issaquah Alps in King County, Washington. It is part of the highlands in the Eastside suburbs of Seattle, and at 1,614 feet it is the lowest and westernmost of the Alps. About two-thirds of Cougar Mountain has experienced residential development, and is home to many neighborhood communities such as Lakemont. The …Cougar Mountain is a peak in the Issaquah Alps in King County, Washington. It is part of the highlands in the Eastside suburbs of Seattle, and at 1,614 feet it is the lowest and westernmost of the Alps. About two-thirds of Cougar Mountain has experienced residential development, and is home to many neighborhood communities such as Lakemont. The forested heart of the hill was officially preserved by King County in June 1983 as Cougar Mountain Regional Wildland Park. Cougar Mountain is home to the Cougar Mountain Zoo.