About
LocationWA
RegionSkamania County
Managed byUS Forest Service - Gifford Pinchot National Forest
Best seasonDecember - April
Entrance feeWashington State Sno-Park Permit required Dec. 1 to March 31.

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 Sno-Park is not a location for recreational sledding . Marble Mountain Ski Trail Map (.pdf) Check Washington State Sno-Parks for current grooming conditions. Climbing Related Information: Winter/early spring climbing tips Climbing preparation, safety and route information. Avalanche Forecasts (West Slopes South) Avalance Observations Map (West Slopes South) ⚠️ Important Alert: A dangerous cornice , an overhanging mass of snow formed by wind, grows through the winter on the leeward side of the wind exposed edge of the summit and crater. As it grows, the cornice can hang quite a distance over the edge, making it fragile and extremely dangerous to walk upon to get a view into the crater. Stay back at least 30 ft (9 m) from the visible edge. There may not be any flagging stakes or markers indicating the danger zone, so use extreme caution. The high summit drift may prevent you from having any view over the rim to the North. Always check current conditions before your climb. Click here to read the most current climbing conditions from Mount St. Helens Institute.

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