"Middle" in difficulty between South and North Sister, this is a nice climb with a great approach - just about 5 miles and 1500 vertical feet to great camping at treeline (from the east). A bit of snow travel, gentle slopes, and one pitch of steep near the top make this a good route for those looking for a moderate multi day trip. This approach to Middle Sister is from the Frog Camp/Obsidian Trailhead at 4,750 feet. You will find a beautiful camp area at Arrowhead Lake (44.1705, -121.8127)
From camp you will follow a fairly gentle, 30 degrees or less, grade in snow up to the saddle between north and middle sister. From there, ascend an exposed rock spine to the summit. You are likely to encounter loose rock and one steeper snow pitch. An alternative route from the West side is more of the NW Ridge, more of a boulder-hop staircase than the scree of the North ridge proper.
Join us for a 3-day climb of Middle Sister with a beautiful approach from the Obsidian Trailhead!
Friday, 8/12: Hike in to basecamp at Arrowhead Lake, about 2,100' gain over 6 miles.
Saturday 8/13: Summit day, about 3,100' of gain. From camp, expect a steady uphill climb on a moderate snow slope. We will rope up to cross the Renfrew glacier. The final summit push will likely be loose scree. We will descent and spend Saturday night back at basecamp at Arrowhead Lake.
Sunday 8/14: We will hike out (with optional side trip to Obsidian Falls) and drive home.