Sno-Park: Marble Mountain

Area Status: Open
This area is Open

Shelter with snow

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.

Marble Mountain Ski Trail Map (.pdf)

Check Washington State Sno-Parks for current grooming conditions.

At a Glance

Current Conditions:
  • 03/01/2021: Forest Road 83 plowed to Marble Mountain Sno-Park. Winter traction tires or chains recommended for the last 1/2 mile. Forty inches of snow on the ground at Marble. Always be prepared for snow and ice on the road this time of year. A good resource to see snow forecasts is this National Weather Service site or Mountain 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.
  • Warmer conditions have led to less snow piling up at the base of Mount St. Helens. This increases the slope on the mountain, making avalanches more likely. Always check the Northwest Avalanche Center West Slopes South forecast and use caution when climbing or snowmobiling.  
  • Mount St. Helens Climbing Permits required year-round. See Permit Information section.
  • Washington State Sno-Park Permit required Dec. 1 to March 31. See Permit Information section.
  • No other fee or pass required.
Permit Info:
  • 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  On sale in March.  
  • 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
  • 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:

General Information


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.

Recreation Map

Map showing recreational areas. Map Information



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Mountain Climbing

Marble Mountain Sno-Park is the starting point for the Worm Flows Climbing Route. This is the primary climbing route used during the winter.

Winter Sports

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Areas & Activities


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  Elevation : 
2,800 ft.