Unicorn, Foss, Boundary & Stevens Peaks


Basic Alpine Climb - Unicorn Peak & The Castle Traverse

This will be a one-day climb of Unicorn with a traverse to The Castle. We will also attempt to summit Foss and Pinnacle based on the efficiency of the party and route conditions. We will pick the better of the two days based on weather. This climb assumes Phase 2 of reopening for both King and Lewis County.

COVID-19: Learn about our most up-to-date guidance for participants and leaders on our COVID-19 Response page. All participants and leaders must agree to the COVID-19 Code of Conduct before participating in this Mountaineers activity.
  • Sat, Jul 4, 2020 — Sun, Jul 5, 2020
  • Seattle Climbing
  • Climbing
  • Basic Alpine
  • Adults
  • Basic Alpine Climb, Strenuous 1, Technical 1
  • Challenging
  • Mileage: 6.3 mi
  • Elevation Gain: 4,500 ft
  • High Point Elevation: 6,971 ft

TBD via email

This climb assumes Phase 2 of reopening for King and Lewis Counties.  Participants should also reside in a county that is in Phase 2 and live within 125 miles of the trailhead.

This climb will be challenging as we will be climbing two peaks in a day (possibly 4).  There are also exposed slopes and 5.6 rock moves required.  Please only sign up for this climb if this is well within your ability/comfort level.

We will plan on climbing on Saturday, but will shift to Sunday if weather on Saturday is undesirable. 


Unicorn, Foss, Boundary & Stevens Peaks

Required Equipment

Required Equipment

  • The Ten Essentials
  • Mountain boots that can accept crampons (not hiking boots)
  • Crampons
  • An ice axe (not technical ice tools)
  • A back pack (40 to 60 liters)
  • Webbing and accessory cords
  • 6 straight gate carabiners
  • 2 locking carabiners
  • Large pear-shaped carabiner
  • Belay device
  • Climbing harness
  • Helmet
  • Chock pick (nut tool)
  • Rescue pulley
  • Fleece or puffy jacket
  • Rain jacket and full-zip rain pants
  • Belay gloves
  • Warm gloves or mittens
Trip Reports