Onsen: A First-Timer's Guide to Japanese Hot Springs

Every visitor should soak in a Japanese hot spring at least once. The water is genuinely therapeutic, the settings run from snowy open-air pools to cedar-scented mountain towns, and the ritual around it — shower, soak, dry, sigh — is half the experience. The rules intimidate first-timers more than they should: there are about six of them, and this page covers all six, plus where to go and what to do if tattoos or shyness complicate the picture.

The Setup: What an Onsen Actually Is

Onsen means hot spring, legally defined by water temperature and mineral content, and in practice it means a bathing facility fed by that water — at a ryokan (traditional inn), a public bathhouse, or a day-visit onsen facility. Bathing is overwhelmingly nude and gender-separated: men’s and women’s entrances marked with curtains (blue for men, red for women, usually — the kanji 男/女 is definitive; 女 is women, 男 is men). A few historic mixed-gender baths (konyoku) survive in remote onsen towns, but they are the exception a first-timer will not stumble into by accident.

Baths are found in the volcanic regions above all — Hokkaido, Tohoku, the mountains north of Tokyo, the Japanese Alps and Kyushu — but every city also has sento (neighborhood public baths) and “super sento” complexes with multiple baths, saunas and restaurants. The classic way to do onsen is a night at an onsen ryokan: arrive mid-afternoon, bathe before dinner in your yukata robe, eat a multi-course kaiseki meal, bathe again before bed and once more before breakfast. Perfection, and priced accordingly.

You do not need the overnight: most ryokan and dedicated onsen facilities open their baths to day visitors for typically ¥500–2,000 — the practice is called higaeri nyuyoku (day-trip bathing), and hot spring towns usually have several options within a walk of the station.

The Ritual, Step by Step

1. Undress completely in the changing room (separate by gender). Put clothes and your large towel in a basket or locker; coin lockers for valuables are common. Bring only your small towel into the bath area.
2. Wash before you soak. Sit on a low stool at the shower or faucet station and clean yourself thoroughly — soap, shampoo, the works — then rinse completely. No soap may enter the bath, ever. This step is the single most important rule of onsen: the bath is for soaking, not cleaning.
3. Enter the bath slowly. Water is typically 40–44°C (104–111°F), hot by pool standards. Slide in gradually, keep movement minimal, and if it feels too hot, sit on the edge with just your legs in until you adjust.
4. Keep the small towel out of the water. Fold it and rest it on your head or on the side of the bath. It is your privacy screen and wipe-down cloth, and it never touches the shared water. Long hair goes up in a tie before entering.
5. Soak quietly. No swimming, no splashing, no submerging your head, conversations at low volume. Try the different baths (indoor, outdoor rotenburo, hotter and cooler pools) with breaks in between — the cooling bench is part of the circuit.
6. Exit without rinsing if the water is mineral-rich — the minerals keep working on your skin. This is advice, not law; rinse if you want to. Pat yourself dry with the small towel before re-entering the changing room so the floor stays dry, then finish with the large towel.

Towels: ryokan provide them in your room or at the bath; public bathhouses sell or rent them for a few hundred yen, and bringing your own is fine. Shampoo and body soap are almost always provided at the wash stations.

Towels, Swimsuits and Other Rules of the Water

The small towel (about the size of a hand towel) travels with you around the bath area and doubles as a fig leaf while walking; the large towel lives in the changing room for drying off. Swimwear is not allowed in virtually all traditional baths — nudity is the norm, and the rare suit-wearing facilities (theme-park style “spa waterparks” like Yunessun in Hakone or the Tanayu hotel aqua garden in Beppu) are explicitly non-traditional exceptions. Bathing caps are not a thing; hair simply gets tied up. Towels with logos of fandoms aside, you carry nothing into the water: no soap, no scrub cloths, no phones (photography anywhere in the bathing area is an absolute ban, for obvious reasons).

Tattoos: Policies and Workarounds

Because of the historical association with organized crime, many onsen and sento — plus municipal pools and gyms — prohibit visible tattoos, often with signage in Japanese and English. The situation is genuinely improving, especially in tourist areas and big cities, and city super sento chains tend to be more relaxed than traditional ryokan, but “improving” is not “solved.” Your options, in order of effort:

1. Cover tape or a patch for small tattoos — sold at drugstores and online, and quietly accepted at many facilities where a full ban is posted for larger work.
2. Tattoo-friendly baths — a growing list that internet searches keep current for each city; look for 「タトゥー可」 (“tattoos OK”).
3. Private baths — many ryokan and larger bathhouses rent private/family baths (kashikiri-buro), sometimes by 30- or 50-minute slots, sometimes needing a same-day reservation at the front desk. Private, tattoo-proof, and ideal with a partner or kids.
4. In-room baths at upscale ryokan — your own hot spring on your balcony.

If in doubt, ask before paying — pointing at your arm and saying 「タトゥーがあるんですが、入れますか？」(“I have tattoos, may I enter?”) gets a clear answer and no offense taken. Our etiquette guide covers the broader tattoo situation in public Japan.

Where and When to Go

For a first onsen, pick a setting that fits your trip: Hakone (easy from Tokyo, mountain views, rotenburo culture), Kinosaki Onsen (a classic willow-lined town where you yukata-stroll between seven public baths), Kusatsu (one of Japan’s most famous hot spring towns), or Noboribetsu and other Hokkaido springs for volcanic drama — our destination pages detail each. In cities, an evening at a super sento — multiple baths, saunas, a restaurant, a nap room — costs roughly ¥1,000–2,000 and is a fantastic low-commitment first dip, often open late into the night; traditional neighborhood sento are cheaper and plainer. Day-use onsen at hot spring towns run about ¥500–2,000. Bring coins: entrance is often cash at smaller facilities, though IC cards and credit cards are increasingly accepted at the big complexes. Hours vary widely — ryokan baths typically run early morning to late evening with cleaning closures — so check before trekking.

Children are welcome; kids young enough to need it may join a parent of either gender (guidelines suggest roughly up to school age), and children are expected to keep the same quiet. Yukata, robes and changing-space slippers all come with the territory — shoe rules apply at the door (see the etiquette guide).

Common Mistakes

• Skipping the wash, or half-doing it. Entering the bath before rinsing thoroughly is the one violation other bathers will genuinely notice and resent. Wash, rinse, then soak.
• Dipping the towel in the water. The towel stays on your head or the edge — in the water it reads as contaminating the bath everyone shares.
• Wearing a swimsuit. It signals you have not read the room — baths are nude. If that is a hard no, book a private bath or a swimsuit spa park instead.
• Photographing anything in the bath area. Phones should stay in the locker, full stop. Selfies in a changing room are as unwelcome as in the bath.
• Assuming your tattoo is too big to matter. Ask first — pointing at the 「タトゥー」 on a sign usually produces a yes/no in seconds, and a cover patch buys entry in many places.
• Rushing. The onsen rhythm is hot soak, cool rest, repeat. Jumping in, boiling five minutes, and leaving defeats the entire institution. Budget an unhurried hour.
• Draining the evening with an empty stomach or a full hangover. Onsen on a big dinner and a bottle of water is bliss; on beer and no food it is a fainting risk. Eat, hydrate, soak.