South Sister: Eastern Approach

Central Oregon, Oregon

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South Sister: Eastern Approach


  • Green Lakes and South Sister.- South Sister: Eastern Approach
  • Water flowing down from Lewis Glacier.- South Sister: Eastern Approach
  • South Sister's Hodge Crest in the distance.- South Sister: Eastern Approach
  • A unnamed trail on South Sister.- South Sister: Eastern Approach
  • Lewis Glacier.- South Sister: Eastern Approach
  • The summit of South Sister.- South Sister: Eastern Approach
  • Middle and North Sister.- South Sister: Eastern Approach
  • Looking south from the South Sister Climber Trail #34.- South Sister: Eastern Approach
  • Broken Top poking through the haze.- South Sister: Eastern Approach
  • Green Lakes and Broken Top.- South Sister: Eastern Approach
  • Lewis Glacier and Broken Top.- South Sister: Eastern Approach
  • Lewis Glacier and Broken Top.- South Sister: Eastern Approach
  • Green Lakes and Broken Top.- South Sister: Eastern Approach
  • - South Sister: Eastern Approach
Overview + Weather
Great view. Empty in spots.
Poor trail conditions. Crowded in spots.
Central Oregon, OR
Pets allowed: 
Net Elevation Gain: 
5,757.00 ft (1,754.73 m)
Parking Pass: 
NW Forest Pass
Preferable Season(s):
Total Distance: 
18.90 mi (30.42 km)
Trail type: 
Trailhead Elevation: 
6,316.00 ft (1,925.12 m)
Current Local Weather:
Hike Description

Hike Description


At 10,318 feet above sea level, South Sister provides stunning views of the Cascade Range and a feeling of self accomplishment that can only be attained from summiting a mountain of this magnitude. When it comes to mountains that are over 10,000 feet, South Sister is unique in that technical mountaineering experience and equipment isn’t necessary, because it is accessible via the 11-mile there-and-back South Sister Climber Trail #36. However, with accessibility comes popularity, and this path is often clogged with hikers eager to experience this awesome display of nature. Although some don’t mind a crowd, if you’re someone that prefers solitude as you hike, there is an alternative route that takes you up the east side of South Sister before eventually meeting up with South Sister Climber Trail for the last portion of the journey.

If you choose to take this route, your first destination will be the three bodies of water that make up Green Lakes. Green Lakes is approximately 6 miles of stress-free, flat hiking into the Three Sisters Wilderness via either Todd Trail Number 34 or Green Lakes Trail. The area sits in the shadows of South Sister and Broken Top and is home to 28 free campsites, making it a great spot to set up camp and prepare for the strenuous hike ahead.

From Green Lakes, the trail doesn’t remain flat for long; the unnamed trail that leads up the east side of South Sister is a jagged, rocky path that has been carved out of the rugged, steep mountainside. This trail has not been managed by anything other than occasional foot traffic, which makes it easy to lose in the landscape if you’re not careful. Along with this, the ice and snow of Lewis Glacier have overwhelmed the trail in spots, requiring you to either carefully forge your own route around the glacier, minding the crumbling rock that covers the mountain, or go over it and try your best not to slip. Crampons will make this part of the hike quite a bit easier. For these reasons it is also recommended that you bring a GPS, because you’ll be able to keep track of the path if you lose it in the mountain’s terrain.

Once you merge with South Sister Climber Trail, it is just over a mile of blustery, calf-burning climbing to the summit. Make sure you pack some warm clothes. The wintry temperatures and screaming winds at 10,318 feet will make the incredible vistas tough to enjoy if you’re wearing the same outfit you were when you set out.

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Updates, Tips + Comments

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Field Guide

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Location + Directions

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(55 within a 30 mile radius)

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