Southeast of Seattle, the hike up and back Marble Mountain is a nine mile roundtrip with 1,500 feet of climbing. The summit offers vistas of St Helens, Mt Adams and Mt Jefferson. Along the way, keep an eye out for mountain lion and grouse. Marble Mountain, a dormant volcano, is 4,111 feet.
The trailhead is located just south of Mt St Helens. To reach the trailhead from US5, use Exit 21. Follow SR503E through Cougar to FS83. Follow FS83 to the trailhead.
Overall, Marble Mountain is the 42nd most popular hiking trail of all 56 hikes in Washington.