Marble Mountain Sno-Park is the starting point for the Worm Flows Climbing Route for Mount St Helens Summit. This is the primary climbing route used during the winter. Marble Mountain Sno-Park offers a trail system that includes 25 miles (snowmobile), and 78.4 kilometers ungroomed (ski). This area is shared with motorized and non-motorized recreationists.
8/15/18: Upper parking lot closed due to construction of new shelter. Lower parking lot open. Climbers can still walk in and start the winter climbing route as usual. No parking allowed on the road. No fee or pass required to use site until further notice.
Permit Info:
A Climbing Permit is required for each person, for each day, year round traveling above 4800 ft elevation on the slopes of Mount St. Helens.
A Sno-Park Permit is required at Marble Mountain Sno-Park during the winter season.
Usage:
Heavy
Busiest Season:
Winter
Restrictions:
Snowmobiles are prohibited in the the Non-motorized corridor between Monitor Ridge and the Worm Flows climbing routes.
The restricted research area north of the volcano is closed to snowmobiles and to off-trail ski and snowshoe travel.
From Cougar, WA drive east on Lewis River Road, which turns into Forest Road 90. Continue on Forest Road 90 until the intersection with Forest Road 83. Turn left on Forest Road 83 and continue approximately 6 miles to the Marble Mountain Sno-Park. During the winter and early spring Forest Road 83 is gated at the Sno-Park.
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