3 miles
4,527 ft
2 miles
High Point


  • Activities
    • Hike
    • Snowshoe
    • Backcountry Ski
    No Mountain Biking
  • Riding Area
  • Ref Number
  • Difficulty Rating
  • Hiking SAC Scale
    T1 Hiking
  • Trail Type
    Ski Run (Off-Piste)
  • Snow Grooming
  • Trail Usage
  • Direction
    Both Directions
  • Physical Rating
  • Trail Visibility
    Sometimes hard to follow
  • Alpine Trail
  • eBike Allowed

The worm flow trail is the preferred climbing route for Winter/Spring climbers wishing to ascend to the rim of Mt. St. Helens. This route ascend the mountain one ridge over from the Summer climbing route, Monitor Ridge, eventually joining the Summer route at the top of the false Summit. The Marble Mountain snopark, where you begin this route, is just barely over 2000 feet in elevation, adding significantly to the elevation you'll have to climb to summit the mountain. Be prepared to boot pack for the first mile or two, potentially on bare dirt, before you'll be able to click in to your skis or split boards. There is a challenging crossing above Chocolate falls, and this route, although "non technical" is by no means a cakewalk either. Ski crampons are highly recommended in addition to your skins. An ice axe might be a good addition as well as crampons for your boots as conditions can become glare ice with melt/freeze cycles. Conditions are highly variable. Bring layers, wear sunscreen. Avalanche danger can be extreme. Check the avalanche forecast and analyze the snowpack on your way up.

Access Info

Access is from the Marble Mountain snopark off of forest service road 83. Valid Washington Sno Park permit is required Dec1 - March 31. Permits can be obtained in the town of Cougar, WA.

More Stats for Worm Flows Climbing Route bike trail trail
  • Altitude change
    4,528 ft
  • Altitude min
    3,720 ft
  • Altitude start
    3,720 ft
  • Altitude end
    8,248 ft
  • Grade
  • Grade max
  • Grade min
  • Distance climb
    3 miles
  • Distance down
    30 ft
  • Distance flat
    20 ft
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Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
Trail Ridden Direction
Trailforks scans users ridelogs to determine the most popular direction each trail is ridden. A good flowing trail network will have most trails flowing in a single direction according to their intension.
The colour categories are based on what percentage of riders are riding a trail in its intended direction.
  • > 96%
  • > 90%
  • > 80%
  • > 70%
  • > 50%
  • < 50%
Trail Last Ridden
Trailforks scans ridelogs to determine the last time a trail was ridden.
  • < 2 days
  • < 1 week
  • < 2 weeks
  • < 1 month
  • < 6 months
  • > 6 months
Trail Ridden Direction
The intended direction a trail should be ridden.
  • Downhill Only
  • Downhill Primary
  • Both Directions
  • Uphill Primary
  • Uphill Only
  • One Direction
Colors indicate trail is missing specified detail.
  • Description
  • Photos
  • Description & Photos
  • Videos
Trail Popularity ?
Trailforks scans ridelogs to determine which trails are ridden the most in the last 9 months. Trails are compared with nearby trails in the same city region with a possible 25 colour shades. Think of this as a heatmap, more rides = more kinetic energy = warmer colors.
  • most popular
  • popular
  • less popular
  • not popular
Max Vehicle Width

Trail Difficulties
  • Access Road/Trail
  • White
  • Green
  • Blue
  • Black
  • Double Black Diamond

Trail Report Status
  • Clear / Green
  • Minor Issue / Yellow
  • Significant Issue / Amber
  • Closed

  • Land Owner Overlay
  • Wilderness (typically no bikes in USA)
  • BLM (public)
  • USFS (Wildlife sanctuaries darker than usfs)
  • State land
  • Indigenous
  • Military
Trail Conditions
  • Unknown
  • Snow Groomed
  • Snow Packed
  • Snow Covered
  • Freeze/thaw Cycle
  • Icy
  • Prevalent Mud
  • Wet
  • Variable
  • Ideal
  • Dry
  • Very Dry
  • Map Markers
  • trail Trail Head
  • photo Photo
  • place Directory Listing
  • region Riding Area
  • Parking Parking
  • Viewpoint Viewpoint
  • Information Information
  • Warning Warning
  • Directions Directions
  • Sight Sight
  • Restrooms Restrooms
  • eBike Charging Point eBike Charging Point
  • Water Fountain/Source Water Fountain/Source
  • Gate Gate
  • Trail Sign Trail Sign
  • Table or Bench Table or Bench
  • Ladder Ladder
  • Stairs Stairs
  • Bridge Bridge
  • Boardwalk Boardwalk
  • Camping Camping
  • Cabin Cabin
  • Lodge Lodge
  • Bear Cache Bear Cache
  • Dock Dock
  • Ranger Station Ranger Station
  • Summit Summit
  • Other Other
      Directions to worm-flows-climbing-route trailhead (46.158080, -122.174290)
      update trails status or condition

      Worm Flows... Trail Reports

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      6 Months
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      youtuber Climbing and Skiing Mount Saint Helens
      20:59 | 14 | Jan 12, 2021 , My City
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