Onsen Bathhouse

What to expect

Onsen is a Japanese-inspired bathhouse and restaurant on Eddy Street in San Francisco’s Tenderloin. It is worth being clear up front: this is not a hot spring. There is no geothermal source. The name borrows the Japanese word for hot spring, but the bathhouse itself says it is closer to a sento, the neighbourhood public bath where locals soak together after work. If you want natural mineral water, you need to leave the city. If you want a hot communal soak, a sauna and a good dinner without driving anywhere, this is the place.

The space is small and dark, with wood, tile and low lighting. The SF Standard put it at about 3,200 square feet. Inside are:

• One communal soaking pool at 104°F40°C, which the SF Standard describes as holding about 15 people.
• A redwood sauna.
• A steam room.
• A custom overhead cold plunge.
• Western-style showers with soap, shampoo, conditioner, toner and mouthwash.

Hot tea is included, along with a locker, towel, robe, sandals and a compostable bag for your wet suit.

The mood is social. Unlike some bathhouses, Onsen does not enforce silence. Conversation is fine as long as voices stay low. The bathhouse says weekends are livelier and the men’s and women’s sessions tend to feel calmer.

History

The original Onsen bathhouse and restaurant closed in 2020. Adam Wren, who had been its general manager, took it over as owner and reopened the bathhouse in April 2025 after a five-year break. The restaurant followed in stages, and now serves a set menu of seasonal California cooking as part of a bath and dinner package from Thursday to Sunday.

Getting there

The address is 466 Eddy Street, between Leavenworth and Hyde streets in the Tenderloin.

• Transit: Civic Center/UN Plaza BART and Muni Metro station on Market Street is a few blocks south. Several Muni bus lines run along nearby streets.
• Driving: Street parking is scarce. The bathhouse points to a garage across the street at 469 Eddy, which it says charges about $15 to $20. It is a separate business, so spaces are not guaranteed.
• Rideshare: Onsen itself recommends a taxi, Uber or Lyft, which is also the easiest way home after a late session.

Arrive at least five minutes before your booking to fill in forms.

When to go

Onsen is indoors and open year-round, so weather does not matter much. San Francisco’s foggy summers and damp winters are good soaking weather either way.

The weekly schedule is what to plan around:

• Monday, 4 pm to 10 pm: men only, swimsuits optional.
• Wednesday, 4 pm to 10 pm: women only, swimsuits optional.
• Thursday, 2 pm to 10 pm: co-ed, swimsuits required.
• Friday to Sunday, 10 am to 10 pm: co-ed, swimsuits required.

Tuesday does not appear on the bathhouse’s published schedule. Some third-party listings show different days, so check the booking calendar before you go.

Weekend sessions book up and feel busier. For a quieter soak, pick a gender-specific evening or an early weekend slot.

Prices and booking

2026 rates:

• Bathhouse, 2 hours: $50 per person, prepaid. Same price for co-ed, men’s and women’s sessions.
• Bath and Dinner: $120 per person for two hours in the bathhouse and a set dinner afterwards, with a $50 per person deposit. Offered Thursday to Sunday.
• Dinner only: bar seating is available without a bath.

Book on Tock. Each booking is capped at four guests, and the bathhouse may cancel bookings that try to get around that. For a larger group, ask about a private booking. Changes or cancellations more than 24 hours ahead get a full refund. Within 24 hours there is no refund, and no-shows are charged. Walk-ins are accepted only if there is space.

Gift cards cannot be redeemed on Tock. Email the bathhouse to book with one, or pay the deposit online and have it credited when you visit.

Rules and etiquette

• 18 and over only in the bathing area.
• Shower first before you use the steam room, sauna or pool.
• Swimsuits required on co-ed days. Clothing is optional on men’s and women’s nights for those who are comfortable with it.
• No phones, photos or filming in the communal bath.
• No outside food or drink in the bathing area.
• Inclusive policy: The owner told the SF Standard that guests are welcome in gender-specific sessions according to the gender they identify with. The house rules ask everyone to respect other bathers of every body type.
• Keep it calm. Talking is fine, loud groups are not.

Where to stay nearby

Onsen is day use only, and its central location means there is plenty of lodging close by:

• Union Square, a short walk east, has the densest cluster of hotels in the city.
• Civic Center and Hayes Valley, just south and west, have boutique hotels close to the opera house and symphony.
• Japantown, about a mile west, has hotels and is a good base if you want Japanese food and shopping close at hand.

Safety notes

• Heat: At 104°F40°C the pool is properly hot. Alternate with the cold plunge and drink water between rounds. Leave if you feel faint.
• Health: The bathhouse asks guests with high blood pressure, heart conditions or pregnancy to check with a doctor first, and to reschedule if you feel unwell.
• The neighbourhood: The Tenderloin is a busy inner-city area with visible street homelessness and drug use. Plan your route, keep valuables out of sight, and consider a rideshare to the door after dark.

Nearby stops worth adding

The Asian Art Museum at Civic Center, a short walk south, pairs well with an afternoon soak. Japantown, with its malls, noodle shops and the Peace Pagoda, is a short ride west.