Mount Thomson, Washington

Prominence: 1514 ft, 462 m

Elevation: 6554 feet, 1998 meters

True Isolation: 2.08 mi, 3.35 km
Elevation Info:NAVD88 Elevation: 6558 ft / 1999 m
Local or Alternate Name(s)Spelling Variant: Mount Thompson
Latitude/Longitude (WGS84)47° 28' 20'' N, 121° 21' 39'' W
47.472323, -121.360711 (Dec Deg)
623524 E 5258956 N, Zone 10 (UTM)
CountryUnited States
County/Second Level RegionKing

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Other Web Sites
     Mount Thomson at
     Thomson; Mount at
     Mount Thomson at Summits on the Air (Amateur Radio)

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Lists that contain Mount Thomson:
     Mountaineers Snoqualmie Peak Pin-First Ten (Rank #1)
     Mountaineers Snoqualmie Peak Pin-All (Rank #2)
     Smoot's "Climbing Washington's Mountains" 100 Peaks (Rank #77)
     Alpine Lakes "Home Court" Top 100 (Rank #18)
     Mid-State Milers (Rank #76)
     Washington State Peaks with 1000 feet of Prominence (Rank #304)

Selected Guidebook(s) for this Peak:
       Climbing Washingtons Mountains (Smoot)
       Cascade Alpine Guide, Vol. 1 (Beckey)

Ascent Info

Total ascents/attempts logged by registered users: 248
     Show all viewable ascents/attempts (Total: 229)

Selected Trip Reports:
     2009-07-28 by Davin Jaggard (Unsuccessful)
     2010-08-29 by Chad Painter (Unsuccessful)
     2012-07-28 by Stephen Smoots
     2012-09-09 by Chad Painter (GPS Track)
     2014-07-05 by Evan L
     2015-08-08 by Jason Curtis (GPS Track)
     2015-08-23 by Sonja Serwold
     2015-09-27 by Chad Straub (GPS Track)
     2016-07-29 by Steve Brown (GPS Track)
     2016-08-21 by Andreas W
     2016-08-26 by Sam Wilson (GPS Track)
     2017-07-22 by Michael Wanberg
     2017-08-12 by Kelly Coons
     2017-08-17 by Dustin Wittmier (GPS Track)
     2017-08-19 by Owen Gabrielson
     2017-09-16 by Gabe O'Leary (GPS Track)
     2017-10-16 by Jason Curtis
     2018-08-05 by Colin P
     2018-09-29 by Karthik Krish (GPS Track)
     2019-07-20 by Luke Helgeson (GPS Track)
     2019-08-19 by Will Thomas
     2019-09-21 by Scott Kindred
     2020-08-01 by Melanie Stam (GPS Track)
     2020-08-15 by Outside & Stuff (GPS Track)
     2020-08-23 by Andrew Yi
     2020-08-23 by Luca Baradel (GPS Track)
     2020-09-04 by Ananth Maniam (GPS Track)
     2021-08-28 by Enji Cooper
     2021-09-21 by Enji Cooper (GPS Track)
     2022-07-15 by Alden Ryno
     2022-08-18 by Rick Teudt (GPS Track)
     2022-09-03 by Jacob Whitbeck (GPS Track)
     2022-09-10 by Ivan Mitloshuk
     2022-10-08 by Mike Black (GPS Track)
     2022-10-13 by Greg Henriksen (GPS Track)
     2022-10-13 by Glen Anderson (GPS Track)

Nearby Peak Searches:
     Radius Search - Nearest Peaks to Mount Thomson
     Elevation Ladder from Mount Thomson
     Prominence Ladder from Mount Thomson

Thomson is one of the most precipitous and pointy peaks near Snoqualmie Pass, and its Matterhorn-like form is a landmark from nearby summits. It is a long hike in from I-90 to its base, and the climb is sustained class-3 scrambling by its easiest route.

This peak is very often spelled "Mount Thompson", by the Montaineers, Beckey, and others, but it is named after famed Seattle municipal engineer R.H. Thomson, and the new USGS 7.5 minute map correctly spells his name.

Click on photo for original larger-size version.
Looking down Mount Thomson's West Ridge, from the belay station at the end of the slabs on pitch 3 (2015-08-08). Photo by Jason Curtis.
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: 1514 ft/462 m
  Optimistic Prominence: 1554 ft/474 m
  Key Col: 5040 ft/1536 m
IsolationIsolation Page  (Detailed isolation information)
   Distance: 2.08 mi/3.35 km
   Isolation Limit Point: 47.4792, -121.3175
Nearest Higher Neighbor in the PBC database:
    Chikamin Peak  (ENE)
RangesContinent: North America
Range2: Pacific Ranges
Range3: Cascade Range
Range4: South Washington Cascades
Range5: Alpine Lakes Area
Range6: Snoqualmie Pass North (Highest Point)
Drainage BasinsSnoqualmie Middle Fork
Snoqualmie North Fork
Puget Sound
Strait of Juan de Fuca
Pacific Ocean
OwnershipLand: Mount Baker-Snoqualmie National Forest
Wilderness/Special Area: Alpine Lakes Wilderness Area
Topo MapChikamin Peak O47121d3 1:24,000
Data Source1:25,000 (or larger) Topographic Survey Map
Dynamic Map

 Mount Thomson    Other Peaks
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Other Photos

Click on photo for original larger-size version.
Thomson from Bumblebee Pass. The scramble route goes up the scree field to the notch on the right, and then up the east ridge (2015-08-02). Photo by Chris Pribbernow.
Click here for larger-size photo.
Click on photo for original larger-size version.
East Ridge route as seen from Alaska Mountain (2019-07-20). Photo by Luke Helgeson.
Click here for larger-size photo.

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