Mount St. Helens Winter Route: Worm Flows

Starting at the Marble Mountain Sno-Park parking lot, follow the Swift Ski Trail #244 north through dense forest to pass several junctions with other ski trails. Along the way, be sure to stay off the cross-country ski tracks as you make your way up moderate grades to reach the trail's end at a junction with the Loowit Trail. From here, follow the signs for the Worm Flows Climbing Route.Once you are above treeline, the trail will follow some wooden posts along one of the lava flows. Eventually, the trail goes onto the rocks, where sometimes you'll see a very marked trail, but not always.Depending on snowfall, the posts could very well be covered, so be sure to bring a GPS or the Mobile App to help keep you on course and off the hazardous glaciers.Upon reaching the caldera rim, head west to reach the highest point on the volcano and a suite of fantastic panoramic views.