Please find Mount St. Helens conditions information at http://www.fs.usda.gov/recmain/mountsthelens/recreation#cond
A valid Washington State Sno-Park Pass is required for each vehicle December 1 to March 31. PLEASE NOTE: Oregon and Idaho Sno-Park Passes are no longer valid as the states ended their reciprocity agreement.
Washington State Sno-Park permits: Sno-Park permits are available to purchase at the Cowlitz Valley Ranger Station and in Vancouver WA at the Gifford Pinchot National Forest Headquarters, or by mail from Washington State Parks, Winter Recreation Program, 1111 Israel Road S.W., Olympia, WA 98504. Learn more athttp://www.parks.wa.gov/winter/Sno-park permits help pay for snow removal, trail grooming, sanitation facilities, mapping, trail signs, safety education, enforcement and program administration.
Attn. Snowmobilers, Skiers & Snowshoers: Climbing permits are required for everyone above 4800 feet on Mount St. Helens. Non-motorized corridor along climbing route is closed to snowmobiles. Area north of the volcano are closed to snowmobiles and to off-trail ski and snowshoe travel.