Hothouse Spa & Sauna

Hothouse Spa & Sauna sits on E Pike St in Capitol Hill and operates as a private-rental bathhouse rather than a drop-in spa. There's no day-pass option here; instead, the whole space is booked out for your group through a reservation system, so you're not sharing the sauna or soaking areas with strangers.

The space is gender inclusive and clothing optional, and it's set up for adults only. Because it's private rental, the vibe is more about reserving the room for your own schedule than fitting into a set class or session time.

Hours run the same every day of the week, 8am to midnight, which gives some flexibility for booking outside typical business hours. To see actual open slots, the venue directs visitors to its own schedule page rather than listing fixed day-pass hours, and there's a mailing list you can join through an email link on the site for updates.

If you're planning a visit, the key things to sort out ahead of time are checking real-time availability on their schedule page and understanding that this is a reservation-only, private-use sauna rather than a communal bathhouse experience.