National Forest Recreation Pass required for parking at the Marble Mountain Sno-Park.
This is the track for the worm flows route, the usual snow route, up Mt. Saint Helens. Park at the Marble Mountain Sno-Park and head north up the trail towards St. Helens. This will lead you to the bottom of the worms, which are open gullies formed from volcanic flows. There will probably be an obvious trail up the south face. Once you clear the trees, the summit is visible, you just have to skin the remaining 4,500' to the summit. There are some rocks to navigate at the bottom, after that, just switchback your way up until the summit.