Lost Peak is a 6,515-foot-elevation (1,986-meter) mountain summit located within Olympic National Park in Jefferson County of Washington state.

Topographic relief is significant as the southeast aspect rises 2,500 feet (760 meters) above the Dosewallips River in approximately one mile.

[6] Weather fronts originating in the Pacific Ocean travel northeast toward the Olympic Mountains.

As fronts approach, they are forced upward by the peaks (orographic lift), causing them to drop their moisture in the form of rain or snow.

[8] The mountains were sculpted during the Pleistocene era by erosion and glaciers advancing and retreating multiple times.