Mount Si, Washington

Prominence: 260 ft, 79 m

Elevation: 4180 feet, 1274 meters

True Isolation: 0.61 mi, 0.97 km
Elevation Info:NAVD88 Elevation: 4184 ft / 1275 m
Alternate Name(s)Kelbts
Highest SummitHaystack
SubpeaksMount Si-North Peak (4167 ft/1270 m)
Peak TypeFamous Peak, but not High Point
Latitude/Longitude (WGS84)47° 30' 25'' N, 121° 44' 21'' W
47.506807, -121.739039 (Dec Deg)
594954 E 5262257 N, Zone 10 (UTM)
CountryUnited States
County/Second Level RegionKing

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Lists that contain Mount Si:
     Famous Peaks that are not High Points (Rank #17)
     Mountaineers Everett Lookout Peaks (Rank #20)
     Smoot's "Climbing Washington's Mountains" 100 Peaks (Rank #100)
     Most Ascended Peaks (Rank #6)
     Peaks with Most Individual Summiters (Rank #44)
     Peaks with most Unsuccessful Attempts (Rank #11)
     Peaks with Most Page Views on Site (Rank #47)

Selected Guidebook(s) for this Peak:
       Climbing Washingtons Mountains (Smoot)

Selected Trip Reports from this site:
     2002-09-08 by Duane Poslusny
     2008-04-20 by Darren Keegan
     2008-05-09 by Trey Pinkerton
     2008-05-13 by Trey Pinkerton
     2010-06-27 by James Kaufman
     2011-10-16 by Noel Howe
     2012-11-11 by Vineeth Madhusudanan (GPS Track)
     2013-01-19 by Chad Straub
     2013-04-14 by Karthik Krish (GPS Track)
     2013-06-21 by Steve Brown (GPS Track)
     2013-10-29 by Monty VanderBilt (GPS Track)
     2014-01-03 by Josh Randow (GPS Track)
     2014-01-26 by Josh Randow (GPS Track)
     2014-07-22 by Walter Blume (GPS Track)
     2015-01-03 by Aharon Elston (GPS Track)
     2015-04-12 by Rusty Sherman
     2015-08-16 by Mihai Giurgiulescu (GPS Track)
     2015-11-01 by Aharon Elston (GPS Track)
     2015-12-24 by Rusty Sherman
     2016-01-24 by Rusty Sherman
     2016-02-07 by Patty Cokus
     2016-03-12 by Rusty Sherman
     2016-04-02 by Rusty Sherman
     2016-06-20 by Mark Hadland (GPS Track)
     2016-07-02 by William Musser
     2016-08-10 by Aaron Nash (GPS Track)
     2017-04-15 by Patty Cokus
     2017-06-05 by Conrad M (GPS Track)
     2017-06-06 by Martin Ralya
     2017-07-12 by Mike B (GPS Track)
     2017-08-20 by Mike B (GPS Track)
     2017-12-05 by Connor McEntee (GPS Track)
     2018-01-31 by Mike B (GPS Track)
     2018-02-04 by Ananth Maniam (GPS Track)
     2018-05-31 by Mike Black (GPS Track)
     2018-06-05 by Mark Hadland (GPS Track)
     2018-06-09 by Mark Hadland (GPS Track)
     2018-06-20 by Mark Hadland (GPS Track)
     2018-10-28 by Patty Cokus
     2019-02-10 by Patty Cokus

View ascents of peak by registered members (1657 total)

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

Mount Si is a well known landmark and a very popular hiking destination, located in the Cascade foothills just east of Seattle. The mountain looms over the town of North Bend, its steep west face rising thousands of feet to craggy pinnacles. As the first high, jagged summit a traveler sees while heading east on I-90, it is an integral part of the rampart that the Cascade Range presents to the Puget Sound area.

A well-graded trail climbs about 3300 vertical feet (from 600 to 3900 feet) in 4 miles to just below the summit "haystack". This is an extremely popular and crowded trail, with estimates of 80,000 - 100,000 users per year, an average of 250 per day (obviously higher than that on sunny summer weekends). Fortunately, a 1993 reconstruction of the trail by the state allows it to handle the load quite well. The ascent is continuously steep and almost entirely in deep forest, with few views between the trees. But near the top, just below the haystack, rocky crags provide spectacular vistas westward over North Bend and the Snoqualmie Valley to Seattle skyscrapers, Puget Sound, and the Olympic Mountains.

Many hikers scramble up the haystack to the very summit, an exposed, hands-needed semi-climb that is not for the acrophobic. The thousands that regularly ply this route have already dislodged all the rotten or loose rock long ago, leaving a nice staircase with good handholds. Still, people have been killed in falls on this short pitch, so be very cautious and don't try it in any kind of bad weather. The view is not too much better at the end of this 200-foot scramble.

In strict topographic terms, Mount Si is not very prominent at all, despite its very impressive west face. To the east, a high, wooded saddle connects Mount Si to an unnamed 4560 peak that is almost 400 feet higher than its famous satellite summit, and beyond that the ridge runs to higher peaks like Mount Teneriffe, Green Mountain, and other forested bumps of little renown.

Note that the USGS topographic map is misleading as to the location of the summit. The spot elevation of 4167 is the lower north summit, and the Haystack (the southern and highest summit) has no marker or elevation on the map. Based on King County GIS contour data, the elevation of the Haystack is over 4180 feet.

Mount Si was named for Josiah "Uncle Si" Merritt, an early local settler. It is pronounced "Mount Sigh", just like the middle syllable of "Josiah".

Click on photo for original larger-size version.
View of haystack (2015-05-09). Photo by Sandeep Kumar.
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: 260 ft/79 m
  Optimistic Prominence: 300 ft/91 m
  Line Parent: Blowdown Mountain
  Key Col: 3920 ft/1195 m
IsolationIsolation Page  (Detailed isolation information)
   Distance: 0.61 mi/0.97 km
   Isolation Limit Point: 47.5117, -121.7283
Nearest Higher Neighbor in the PBC database:
    Blowdown Mountain  (NE)
RangesContinent: North America
Range2: Pacific Ranges
Range3: Cascade Range
Range4: South Washington Cascades
Range5: Alpine Lakes Area
Range6: North-Middle Forks Snoqualmie
Drainage BasinsSnohomish
Puget Sound
Pacific Ocean
OwnershipLand: Washington State Department of Natural Resources
Topo MapMount Si O47121e6 1:24,000
Route #1 Maintained Hiking Trail: Mount Si Trail
Trailhead: Mt. Si Trailhead 660 ft/201 m
Vertical Gain: 3520 ft/1073 m
Distance (one way): 4 mi/6.44 km
Data Source1:25,000 (or larger) Topographic Survey Map
Dynamic Map

 Mount Si    Other Peaks
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Other Photos

Click on photo for original larger-size version.
Me at the summit (2015-05-09). Photo by Sandeep Kumar.
Click here for larger-size photo.

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