South Twin, Washington

Prominence: 3520 ft, 1073 m

Elevation: 7000+ feet, 2134+ meters

True Isolation: 6.49 mi, 10.44 km
Elevation Info:Elevation range: 7000 - 7040 ft
    (40-foot closed contour)
NAVD88 Elevation: 7004 ft / 2135 m
    (Range 7004 - 7044 ft)
Latitude/Longitude (WGS84)48° 42' 18'' N, 121° 59' 15'' W
48.704873, -121.987539 (Dec Deg)
574490 E 5395143 N, Zone 10 (UTM)
CountryUnited States
County/Second Level RegionWhatcom

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Other Web Sites
     South Twin at SummitPost
     South Twin at ListsOfJohn
     South Twin Sister at
     South Twin at Summits on the Air (Amateur Radio)

Weather and Snow
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     NOAA Snow Depth Map

Lists that contain South Twin:
     USA Lower 48 Top 400 Peaks by Prominence (Rank #235)
     Washington State Peaks with 2000 feet of Prominence (Rank #32)
     Mountaineers Baker's Dozen (Rank #16)
     Washington State Top 200 by Prominence (Rank #32)
     Washington State Peaks with 1000 feet of Prominence (Rank #32)
     Southwest British Columbia-Gunn Scrambles (Rank #93)

Selected Guidebook(s) for this Peak:
       Cascade Alpine Guide, Vol. 3 (Beckey)

Ascent Info

Total ascents/attempts logged by registered users: 101
     Show all viewable ascents/attempts (Total: 96)

Selected Trip Reports:
     1989-07 by Mike Stinson (Unsuccessful)
     1995-05-07 by Brian Friedrich (Unsuccessful)
     1995-05-21 by Brian Friedrich
     2009-08-20 by Jan Triska
     2012-08-19 by Adam Walker
     2012-08-25 by Eric Noel
     2013-07-27 by Paul Michelson
     2013-08-08 by Fred Beavon
     2014-07-26 by Evan L
     2014-07-26 by Brandon Myers
     2015-08-27 by Ken Jones (GPS Track)
     2020-06-28 by Andrew Brooks (Unsuccessful) (GPS Track)
     2020-08-19 by Fletcher Jordan
     2020-08-23 by James Barlow
     2020-08-23 by Greg Slayden (GPS Track)
     2020-08-29 by James Prager (GPS Track)
     2020-08-29 by Outside & Stuff (GPS Track)
     2020-09-07 by Ivan Mitloshuk (GPS Track)
     2021-07-13 by Nick Magill
     2021-07-17 by Liz Mack (Unsuccessful)
     2021-08-08 by Amy Zamora (Unsuccessful)
     2021-08-14 by Mike Black (GPS Track)
     2021-09-16 by Susan Shih (GPS Track)
     2022-08-09 by Rob Woodall (GPS Track)
     2022-09-05 by Ryan Stoddard (GPS Track)
     2022-10-01 by Michael Lemieux (GPS Track)

Nearby Peak Searches:
     Radius Search - Nearest Peaks to South Twin
     Elevation Ladder from South Twin
     Prominence Ladder from South Twin

South Twin is the highest point on the Twin Sisters Range west of Mount Baker. The lower North Twin is probably climbed more frequently. Routes on South Twin involve a complex approach on logging roads and faint use trails, and extended scrambling up long ridges.

The USGS map for South Twin shows a 7000-foot contour at the west end of the summit ridge, however the Sisters Benchmark about 500 feet ESE is actually the high point, even though it does not have a 7000 foot contour. Adding to the mystery, the benchmark is at 6932 feet, which seems very low given the contours on the map.

Click on photo for original larger-size version.
South Twin, from near the summit of North Twin (2015-06-06). Photo by George Burgess.
Click here for larger-size photo.
Web Map LinksPeakfinder Panorama
GeoHack Links   CalTopo   MyTopo   Bing Maps
Google Maps   Open Street Map
ProminenceKey Col Page  (Detailed prominence information)
  Clean Prominence: 3520 ft/1073 m
  Optimistic Prominence: 3600 ft/1097 m
  Line Parent: Sherman Peak
  Key Col: Elbow Lake    3480 ft/1061 m
IsolationIsolation Page  (Detailed isolation information)
   Distance: 6.49 mi/10.44 km
   Isolation Limit Point: 48.755, -121.8675
Nearest Higher Neighbor in the PBC database:
    Seward Peak  (ENE)
RangesContinent: North America
Range2: Pacific Ranges
Range3: Cascade Range
Range4: North Cascades
Range5: Skagit Range
Range6: Twin Sisters-Foothills (Highest Point)
Drainage BasinsNooksack
Strait of Georgia
Pacific Ocean
OwnershipLand: Mount Baker-Snoqualmie National Forest
Wilderness/Special Area: Mount Baker Wilderness Area
Topo MapTwin Sisters Mountain O48121f8 1:24,000
Data Source1:25,000 (or larger) Topographic Survey Map
Dynamic Map

 South Twin   ( Key Col)    Other Peaks
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Other Photos

Click on photo for original larger-size version.
Fun scrambling on South Twin Sister (2020-08-22).
Click here for larger-size photo.

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