Mount Stone is a 6,612-foot peak in the Olympic Mountains. It is the highest point in Mason County, Washington and exceeds 2,000 feet in prominence. Mount Stone can be reached via the North Hamma Hamma Road. Climbing Mount Stone involves a class 3 rock scramble. This can be done either as a day climb or an overnight trip. On a clear day one ca…Mount Stone is a 6,612-foot peak in the Olympic Mountains. It is the highest point in Mason County, Washington and exceeds 2,000 feet in prominence. Mount Stone can be reached via the North Hamma Hamma Road. Climbing Mount Stone involves a class 3 rock scramble. This can be done either as a day climb or an overnight trip. On a clear day one can view many of the major peaks of the Olympic Mountains, including The Brothers, Mount Washington, Mount Anderson, Mount Deception, Mount Constance, and Mount Olympus.