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Ryokan with an open-air bath in the room in Kusatsu

Stays in Kusatsu where you can soak in an onsen bath on your own room’s terrace.

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Stays in Kusatsu

10 stays
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  1. Naraya

    Naraya

    Kusatsu, Gunma

    • Rooms with private open-air bath
    • Reservable private bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring · Free-flowing

    pH 2
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaRakuten TravelJalan
    Sources & details
    • Tattoos OK if covered
    • Analysis report on file
    • Free-flowing (posted notice)
    • Private bath checked Oct 2026
    • Tattoo rule checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type; Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 240.6 mg/kg

    Source: in-room bath (kusatsu-naraya.co.jp) · private bath (kusatsu-naraya.co.jp) · tattoo rule (kusatsu-naraya.co.jp) · Checked May 31, 2026

  2. Kusatsu Now Resort Hotel
    • Rooms with private open-air bath
    • Reservable private bath

    Property's note: Guests with tattoos are not permitted to use the public baths or swimming pool. Private baths (for a fee) are available. Tattoos are permitted if completely covered. Cover-up stickers were available for purchase.

    Acidic Spring · Chloride spring

    pH 1.75
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaBooking.comRakuten TravelJalan
    Sources & details
    • Tattoos OK if covered
    • Analysis report on file
    • Tattoo rule checked Oct 2026

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Metasilicic acid 528.3 mg/kg

    Source: in-room bath (travel.yahoo.co.jp) · private bath (travel.rakuten.co.jp) · tattoo rule (kusatsu-now.jp) · Checked May 31, 2026

  3. Libmax Resort Kusatsu Onsen
    • Rooms with private open-air bath

    Acidic Spring · Chloride spring · Free-flowing

    pH 1.75
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaBooking.comRakuten Travel
    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)
    • Private bath checked Oct 2026

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  4. Kusatsu Onsen Hotel Sakurai
    • Rooms with private open-air bath

    Acidic Spring · Chloride spring · Free-flowing

    pH 1.75
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaRakuten TravelJalan
    Sources & details
    • Analysis report on file
    • Free-flowing (posted notice)

    Spring type: Acidic Hydrogen Sulfate and Chloride Hot Spring (Hypotonic Acidic high-temperature hot spring) / Free-flowing from the source, with no added water, heating or recirculation / Metasilicic acid 528.3 mg/kg

    Source: in-room bath (hotel-sakurai.co.jp) · Checked May 31, 2026

  5. Kusatsu Onsen Juninya Ryokan
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    pH 2
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onRakuten TravelJalan
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  6. Kusatsu Onsen Yubatake Sensuimizu
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    pH 2
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaBooking.comRakuten TravelJalan
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  7. Kusatsu Onsen Yubatake Soan
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    pH 2
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaRakuten TravelJalan
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type) / Metasilicic acid 242.7 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  8. Kusatsu Onsen Urakusatsu Tou
    • Rooms with private open-air bath

    Sulfur Spring · Acidic (pH under 3) · Chloride spring

    pH 2
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaBooking.comRakuten TravelJalan
    Sources & details
    • Analysis report on file
    • Private bath checked Oct 2026

    Spring type: Acidic Sulfur-containing Aluminum Sulfate and Chloride Hot Spring (hydrogen sulfide type; Hypotonic Acidic high-temperature hot spring) / Metasilicic acid 234.1 mg/kg

    Source: in-room bath (travel.rakuten.co.jp)

  9. Yuyado Tokinoniwa

    Yuyado Tokinoniwa

    Kusatsu, Gunma

    • Rooms with private open-air bath
    • Reservable private bath

    Acidic Spring · Chloride spring

    pH 2.4
    See the spring data ›
    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaBooking.comRakuten TravelJalan
    Sources & details
    • Analysis report on file

    Spring type: Acidic Aluminum Sulfate and Chloride Hot Spring / Metasilicic acid 165 mg/kg

    Source: in-room bath (ikyu.com) · private bath (dormy-hotels.com) · Checked May 31, 2026

  10. Kusatsu Onsen Yuyado Iwafuji
    • Rooms with private open-air bath

    No onsen analysis report on file yet

    PRIncludes affiliate links
    View rates on Trip.com
    Also onAgodaExpediaRakuten Travel
    Sources & details
    • Private bath checked Oct 2026

    Source: in-room bath (travel.rakuten.co.jp)

Sorted using onsen analysis reports and what each property states on its own or booking-site page.

About in-room open-air baths
Rooms with a private open-air bath
The bath is part of your guest room (kyakushitsu rotenburo). Usually only some room types have one, so check the room type when you book.

The water in a room’s bath may come from a different source, or be heated or recirculated differently, than the shared baths. Even for stays with an analysis report, ask the property how the in-room bath is supplied.

How we know

A stay is listed only when its official website or booking-site page says some rooms have a private open-air bath. Usually only certain room types have one, so check the room type when you book.

  • Private bath and tattoo information comes from each property's official website or other published information. Every item links to its source and shows the date we last checked it. Items we could not source are left out.
  • Spring type, pH and how the water is used come from the onsen analysis report that Japanese law requires each facility to post, and from the facility's water-usage notice. They are shown only for stays whose report we have on file.
  • Details can change after we check them. Please confirm with the property before you book, especially tattoo rules and private bath fees.
  • Booking buttons are affiliate links. They do not affect which stays are listed.
See also
Ryokan with private onsen in Kusatsu