Mount St. Helens/Worm Flows

A scramble of 12 miles with 5,700 feet of gain and the preferred winter route.


Take Exit 22 off of I-5 and merge onto Dike Access Rd. Continue onto Old Pacific Highway and bear left onto E Scott Ave. At the traffic circle take the second left onto Lewis River Rd. In ~30 miles, Lewis River Rd continues as Road 90. Turn left at Forest Road 83, and in ~6 miles turn right into the Marble Mountain Sno-Park (2,600 ft).


  • Climbing permits are required and done by lottery with the land manager.
  • A Sno-Park parking permit may be needed during month of April for the Marble Mountain Sno-Park.

information FOR LEADERS

scheduling & permits

  • This route allows multiple bookings. Please check scheduled trips listed below in the "Activities" tab to see if there is another group already booked on the same day. Leaders are expected to contact the leader(s) of existing trips to ensure there are no concerns or conflicts, according to The Mountaineers Outdoor Ethics Policy.
  • Leaders are responsible for obtaining climbing permits during the permitted season.
  • Difficulty: Strenuous 5, Technical 4, Winter Scramble
  • Length: 12.0 mi
  • Elevation Gain: 5,700 ft
  • 8,363 ft
  • USGS Mt St Helens
  • Green Trails Mount St Helens NVM No. 332S
  • Green Trails Mt St Helens NW No. 364S

Upcoming Activities

Winter Scramble - Mount St. Helens/Worm Flows

Scrambling Trip
Annual climb of my favorite volcano before permitting season begins.
Difficulty: Winter Scramble
Sat, Mar 16, 2024 - Sun, Mar 17, 2024
Prerequisites, Leader's Permission Required
15 participants on waitlist 1 leader on waitlist
Registration closes Mar 14
Foothills Branch
Travis Prescott

Junior Mac Rock Climb Weekend Trips - Mount St. Helens/Worm Flows

Youth Youth activity: Junior MAC - Olympia
Weekend trips for Jr MAC youth and their families to get out, practice their climbing
Difficulty: Strenuous 5, Technical 4, Winter Scramble
Sat, Jun 8, 2024 - Sun, Jun 9, 2024
No Prerequisites
11 participants 12 chaperones
Registration closes Jun 6
Olympia Branch
Claire Edwards
Qualified Youth Leader
Trip Reports

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  • Chocolate Falls

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