Elliott Bay Sauna & Hot Tub
Federal Way, WA
$$Private rentalPool / hot tub
Private hourly suites south of Seattle with redwood/cedar dry saunas and hot tubs — open until midnight daily.
Federal Way — not on the Seattle waterfront.Cedar Dry Sauna
Saunas in South King County
Listings with a Renton, Federal Way, or other South King mailing address. Soak & Sage (Renton) and Elliott Bay (Federal Way) land here.
Summaries reflect our last editorial pass (March 2026). Hours and prices change — confirm with each venue.
4 listings in South King County
Float Seattle
Greenwood, South Lake Union, Bellevue & Renton
$$Cold plunge
Float tanks, infrared sauna, and cold plunge at four studios: Greenwood, South Lake Union, Bellevue, and Renton Landing.
Infrared
Palace Spa
Federal Way, WA
$$Cold plungeSteam room
Large Korean-style jjimjilbang day spa south of Seattle — multiple heated rooms, pools, body scrubs, and spa services.
Federal Way — confirm hours and admission on the venue site.Social Wellness
Best full bathhouse circuit
Soak & Sage
Renton, WA
$$Cold plungeSteam roomPool / hot tub
195–230°F
Social wellness bathhouse on Lake Washington — named 2025 Best Day Spa in PNW by The Seattle Times.
Social Wellness