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.
05/20/2021: Forest Road 83 clear to Marble Mountain. Patchy snow on the ground. A few potholes have been reported on the 83. Road may be icy.
To protect the mountain environment, please bring your own blue bags. Only a small supply is provided, and they run out quickly.
A good resource to see forecasts is this National Weather Service site or Mountain Forecast.com. Elevation at Marble is 2,600 feet. 83 is gated for the winter just past the sno-park. Conditions can change quickly. Always be prepared.
Fees
Mount St. Helens Climbing Permits required year-round. See Permit Information section.
Mount St. Helens Climbing Permit required for each person, for each day, year-round, traveling above 4800 feet on the slopes of Mount St. Helens:
April 1 through Oct. 31: Permits purchased in advance at Recreation.gov on a rolling basis. Permits for all of April go on sale March 1 at 7:00 am, all of May go on sale April 1, etc.
Nov. 1 to March 31: Permits available at Marble Mountain Trailhead and are free.
Washington State Sno-Park Permit required Dec 1 to March 31. Purchase online or at local vendors. One per vehicle. Not available on-site.
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.
Closest Towns:
Cougar, WA
Water:
No
Restroom:
Vault Toilets (2)
Information Center:
Mount St. Helens National Volcanic Monument Administrative Headquarters (360) 690-5231
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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