Sno-Park: Marble Mountain

Area Status: 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 IS NOT A LOCATION FOR RECREATIONAL SLEDDING

Marble Mountain Ski Trail Map (.pdf)

Check Washington State Sno-Parks for current grooming conditions.

At a Glance

Current Conditions: 11/04/22: Winter conditions have arrived; There is 10 inches of snow on the road at Marble Mountain. High clearance vehicles with 4-Wheel Drive strongly recommended to this point, chains recommended to travel further on the 83 Road. Snow plowing by the state will not start until December 1st. Climbers must now use the Worm Flows winter route starting at Marble Mountain.
  • 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 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.
  • 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 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
  • 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
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.

General Notes:

Marble Mountain Non-motorized Winter Trails Map (.pdf)

Marble Mountain Non Motorized Snow Trails Vicinity Map

Recreation Map

Map showing recreational areas. Map Information


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.

XC Skiing/Snowshoeing


Recreation Areas

Recreation Activities


  Latitude : 

  Longitude : 

  Elevation : 
2,800 ft.