{{short description|Mountain peak in Washington, USA}} {{Use American English|date=September 2025}} {{Use mdy dates|date=January 2025}} {{Infobox mountain | name = Foss Peak | image = Foss Peak from road.jpg | image_caption = Foss Peak from northeast | elevation_ft = 6524 | elevation_ref = <ref name="pb">{{cite peakbagger|2322|Foss Peak, Washington}}</ref> | prominence_ft = 404 | prominence_ref = <ref name="pb"/> | isolation_mi = 0.85 | isolation_ref = <ref name="listsofjohn">{{cite web|url=https://listsofjohn.com/peak/49961|title="Foss Peak" - 6,524' WA|website=listsofjohn.com|accessdate=February 20, 2022}}</ref> | parent_peak = Unicorn Peak (6,971 ft)<ref name="listsofjohn"/> | country = United States | state = Washington | region = Lewis | region_type = County | part_type = Protected area | part = Mount Rainier National Park | range = Cascades | map = Washington#USA | map_caption = Location in Washington | map_size = 270 | label_position = right | coordinates = {{coord|46.755223|N|121.712709|W|type:mountain_region:US-WA_scale:100000_source:ngs|format=dms|display=inline,title}} | coordinates_ref = <ref name="pb"/> | topo = USGS ''Mount Rainier East'' | age = | first_ascent = | easiest_route = {{YDS|2}} scrambling<ref name="listsofjohn"/> }}
'''Foss Peak''' is a {{Convert|6524|ft|m|abbr=off|adj=on}} summit in the Tatoosh Range which is a sub-range of the Cascade Range. It is located south of Mount Rainier within Mount Rainier National Park, in Lewis County of Washington state. The peak is named for Thea Foss (1857–1927), who founded the Foss Maritime Company with her husband in 1889. The peak also has an alternate name, ''Manatee Mountain''.<ref name="pb"/> The nearest higher neighbor is West Unicorn Peak, {{convert|0.79|mi|km}} to the southeast.<ref name="pb"/> Precipitation runoff from the mountain drains into tributaries of the Cowlitz River.
==Climate== Foss Peak is located in the marine west coast climate zone of western North America.<ref name="Beckey, Fred W 2008">Beckey, Fred W. Cascade Alpine Guide, Climbing and High Routes. Seattle, WA: Mountaineers Books, 2008.</ref> Most weather fronts originating in the Pacific Ocean travel northeast toward the Cascade Mountains. As fronts approach, they are forced upward by the peaks of the Cascade Range (orographic lift), causing them to drop their moisture in the form of rain or snow onto the Cascades. As a result, the west side of the Cascades experiences high precipitation, especially during the winter months in the form of snowfall.<ref name="Beckey, Fred W 2008"/> Because of maritime influence, snow tends to be wet and heavy, resulting in avalanche danger.<ref name="Beckey, Fred W 2008"/> During winter months, weather is usually cloudy, but due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer.<ref name="Beckey, Fred W 2008"/>
==Gallery== <gallery class="center"> File:Unicorn and Foss.jpg|Unicorn Peak (left) and Foss Peak (right) in winter File:Foss Peak aka Manatee Mountain.jpg|Foss Peak (aka Manatee Mountain) File:Unicorn Peak 8421s.JPG|Unicorn Peak (left), West Unicorn Peak, and Foss Peak (right) File:Louise Lake, Foss Peak, Unicorn Peak.jpg| Louise Lake, Foss Peak, and Unicorn Peak. File:Foss Peak.jpg|North-northeast aspect of Foss Peak </gallery>
==See also== * List of geographic features in Lewis County, Washington
==References== {{Reflist}}
==External links== * National Park Service web site: [https://www.nps.gov/mora/index.htm Mount Rainier National Park]
Category:Cascade Range Category:Mountains of Lewis County, Washington Category:Mountains of Washington (state) Category:One-thousanders of the United States Category:Mount Rainier National Park