Japan Onsen Guide: Etiquette, How to Choose, and Where to Soak

You’ve booked a ryokan with hot-spring baths and now you’re standing in front of two curtains, one red and one blue, holding a basket and a thin cotton towel and trying to remember what happens next. The pamphlet on the bed didn’t quite cover it. The internet says contradictory things. Half the guides talk about ritual, the other half talk about rules, and nobody answers the practical questions: where exactly do you put the towel, what happens if you have a tattoo, do you wash before or after you soak, and is your hair really meant to be tied up the whole time. Yes, yes, before, and yes. Here’s the rest.

I’ll start with the legal definition because everything else makes more sense once you have it. Japan’s Onsen Law, administered by the Ministry of the Environment, draws a clear line: water that comes out of the ground at 25°C or above counts as onsen, and so does cooler water that meets prescribed thresholds for any one of nineteen mineral or chemical components. Steam and gas qualify too if they tick the same boxes. The 25°C floor is why some “onsen” baths feel cooler than your hotel shower. The mineral list is why the water near Kusatsu smells like a chemistry set and the water at Yufuin doesn’t.

None of this matters at the moment when you’re trying to work out which curtain to walk through. But it does explain why a Japanese hot spring isn’t really a spa. It’s a regulated geological resource, and the etiquette grows out of treating it as one.

What an onsen actually is, and what it isn’t

The country has more than 27,000 hot-spring sources scattered across volcanic geography, from steaming Hokkaido coastlines to subtropical Kyushu. Some are managed by the village they sit in, some by a single ryokan, some by a city. They divide into roughly four kinds of place to bathe, and knowing which one you’re walking into changes how to behave.

A ryokan with private hot-spring baths is the high-end experience: you sleep on a futon, eat a multi-course kaiseki dinner, and the baths inside the inn are reserved for guests. A kyodo-yokujou or sotoyu is a public bathhouse fed by the town’s onsen source, open to anyone for a few hundred yen; the seven (currently six operating, with Satono-yu closed for renovations from 1 April 2024 per the Visit Kinosaki official site) baths of Kinosaki are the model. A modern onsen hotel uses piped onsen water in a Western-style hotel structure. And a sento is a city neighbourhood bathhouse, often with no naturally heated spring water at all, governed by similar etiquette but legally a different category of facility.

If you’re aiming for the postcard version, you want a ryokan with at least one outdoor bath. If you want the ritual without the price tag, you want a public bathhouse in an onsen town. If you live in Japan and need a soak after a long day, sento. The four overlap on etiquette but diverge on price and atmosphere.

Where the water comes from changes the experience

Sulphur springs smell strongly of struck matches and turn copper jewellery brown; the mineral is reckoned good for skin conditions but rough on sensitive eyes, so don’t sit too close to the steam vent. Sodium-chloride springs feel salty on the lips and retain heat in the body for hours afterwards. Carbonated springs, which are rarer, fizz gently against your skin and feel cool initially before warming. Iron-bearing springs run rust-coloured and stain a white towel permanently if you let them. Radium springs, found at Misasa in Tottori and a handful of other places, contain trace radioactive elements; the doses are low and the science around the claimed benefits is contested, but the locals will swear by them.

The chemistry is genuine, but it’s also written on the wall in every changing room. Look for a small framed sign with the spring’s name, source temperature, pH, mineral classification and listed indications. The information is required by law and worth thirty seconds of your time before you bathe. If it tells you the water is highly acidic, that’s the cue to rinse off afterwards rather than letting the minerals dry on your skin.

The actual sequence, step by step, with no nonsense

Here is what to do, in order, the first time. I’ll mark the bits that trip up first-timers most.

1. Take your shoes off at the entrance

The entryway has a row of small lockers or a wooden rack. Slide off your shoes and either store them in a locker (sometimes ¥100 returnable) or leave them on the rack. Slip on the provided indoor slippers if there are any. You walk over the tatami of the lobby and corridor in slippers, and you’ll take the slippers off again at the door of the changing room.

2. Pay if you haven’t already

If you’re staying at the ryokan, the baths are included with your room. If you’re walking in off the street to a public bath, pay at the counter or, in the older village sotoyu, at a coin box. Bring small change. Adult entry to a public onsen typically runs ¥400–900, depending on the prefecture and how recently the bath was renovated. Satono-yu in Kinosaki, before its renovation closure, was ¥900 for adults and ¥450 for children, which is the upper end and reflects its panoramic top-floor outdoor bath; verified on visitkinosaki.com on 6 May 2026.

3. Find the right curtain

Two curtains, almost always. Red is conventionally women, blue or indigo is conventionally men. The kanji are 男 (otoko, men) and 女 (onna, women). At many traditional ryokan, baths swap between genders by time of day, so the curtain you saw at 19:00 may have moved by 06:00 the next morning; check the schedule posted near the entrance.

4. Strip in the changing room

Everything off. No swimsuit (which is treated as unhygienic, since it’s been to other waters), no underwear, no anything below the small wash towel you’ll carry into the bath. Put your clothes in a basket or locker; if there’s a key on a wristband, wear it. Glasses are fine in the bath as long as they don’t fog up too badly. Watches and jewellery come off because the minerals in some waters tarnish silver and dull gold.

The nudity is the part everyone obsesses about beforehand and forgets about within sixty seconds of entering the bath. Nobody is looking. Everybody is doing the same thing. Staring is genuinely taboo, to the point that I’ve watched a Japanese bather drop their towel and reach for it without anyone in the room appearing to notice. The first time is awkward. The second time is fine.

5. Wash, sitting, completely

This is the rule that matters most: wash before you soak, not after. A row of small plastic stools sits in front of low showers along the wall. Sit on a stool. Use the provided shampoo and body wash, or your own. Scrub thoroughly. Rinse with the showerhead or with the small wooden bucket beside it. Make sure no suds are left on you when you stand up. The communal bath is for clean bodies only, and shampoo bubbles drifting across the surface of an outdoor pool will make you instantly the most disliked person in the prefecture.

Don’t stand up while showering. The drain channels are designed for splash from a sitting position, and standing makes you a sprinkler. If your hair is long, tie it up before you sit down; the wash rinse is a good time to do it.

6. Walk to the bath, wash towel only

Carry only the small wash towel into the bathing area. The larger drying towel stays in your locker. Walk slowly; the floors get slick. If a small group is heading the same way, let them go ahead rather than queueing for a single tap.

7. Enter slowly, no splash

The water is usually 40–42°C, sometimes hotter. Don’t dive, don’t jump, don’t even step in heavily. Lower yourself to the steps if there are any, or sit on the edge first and slide in. Submerging quickly into 42°C water can spike your blood pressure, and the locals will visibly flinch if you splash them. Get in up to your shoulders. Sit. Breathe out.

Two things never go in the water: your hair and your towel. Tie the hair up. Fold the towel and place it on the lip of the bath, or do what the locals do and balance it folded on top of your head, where it stays cool and helps keep your scalp from overheating. The towel-on-the-head image is iconic Japan and also genuinely useful: it’s the trick that lets you stay in a 42°C bath for fifteen minutes without lightheadedness.

8. Soak, then rest, then soak again

Ten to fifteen minutes is a typical first soak. Then climb out, pour cool water over your wrists and the back of your neck, sit on the side or on a stone bench, and let the heat redistribute. Drink some water if there’s a fountain. Then go back in for another ten. The Japanese bathing rhythm is half-bath then full-bath then a rinse and a rest, repeated as the body asks for it. A single forty-minute soak is harder on the body than three twelve-minute soaks separated by short cool-downs.

If you start to feel lightheaded, get out slowly. Sit on the floor if you have to. The heat-stroke risk in a 42°C bath is real but easily managed: leave before you feel pushed.

9. Pat dry, then dress

When you finish, don’t rinse off; the minerals are the point. Use the small wash towel to wipe yourself down before you cross back into the dry changing room. Drying off in the bathing area means a smaller puddle in the changing room, which means a happier next bather. Drink a glass of cold water. The traditional post-bath drink is cold milk from a vending machine in the lobby, which is more refreshing than it sounds and a small ceremony in itself.

The tattoo question, honestly

The historic association between tattoos and yakuza means many onsen still ban visible ink, and you should expect to encounter the rule at least once on a long trip. The rule has loosened considerably in the last decade, though, and there are now three reliable workarounds.

First, choose a tattoo-friendly destination. Kinosaki Onsen on the Sea of Japan coast made the most public commitment, with its 1,300-year-old town association declaring all public baths open to tattooed visitors; the policy is reaffirmed on the official Visit Kinosaki site. Hakone, Beppu and Kusatsu have growing lists of ryokan that explicitly welcome tattoos, often badged with a sticker on the door or a line in the English information sheet. Beppu’s tourism authority publishes a periodically updated map of tattoo-friendly facilities at enjoyonsen.city.beppu-jp.com.

Second, book a private bath. Many ryokan offer kashikiri-buro, a private bath you reserve for forty-five minutes. Costs run from free (included with the room) to around ¥3,000. Some hotels with onsen attached, including chains like Dormy Inn, have rooms with private in-room baths fed by the same source. The privacy solves the tattoo problem entirely.

Third, cover the ink. Small tattoos can be hidden under a flesh-coloured plaster or a stick-on cover sold for the purpose; some ryokan stock them at reception. This works only if the tattoo is genuinely small. A full sleeve, a chest piece, or a back panel can’t be plastered over and shouldn’t be attempted. For larger work, fall back to private bath or tattoo-friendly destination.

Whichever route you take, ask before you strip. The reception staff would rather give you a polite “I’m sorry” than have to ask you to leave the bathing area. The conversation in Japanese is “irezumi wa daijobu desu ka” (are tattoos all right); in English it’s “is your bath OK with tattoos.” Both work fine.

How to choose an onsen, by what you actually want

There is no single best onsen in Japan. There’s a best one for what you want from your specific trip, which means the right question is what kind of soak you’re after. Five rough categories cover most travellers:

You want the iconic, photographable Japan

Aim for an onsen town where the architecture is the draw and the bath is the reason you’re there. Ginzan Onsen in Yamagata, photographed at the top of this article, is the famous wooden-ryokan-on-a-river image; it’s narrow, cold in winter, hard to reach (Oishida Station plus a 40-minute bus), and worth every minute. Kinosaki Onsen in Hyogo is the seven-baths-with-yukata-stroll experience, walkable in an evening. Kusatsu Onsen in Gunma is the high-volume, sulphurous, mountain-spa-town version, with the dramatic yubatake wooden cooling channels at its centre.

You want easy access from Tokyo

Hakone Onsen wins on this criterion, full stop. It’s 90 minutes from Shinjuku via the Odakyu Romancecar (around ¥2,470 reserved). The town is large enough that a wide range of baths and ryokan is available at every price point, and it doubles as a Mt Fuji viewing spot when the weather cooperates. Kinugawa Onsen is similar distance to the north for a less Tokyo-saturated alternative. Atami is closer (50 minutes by Shinkansen) and has a sea-view appeal but feels more developed and less ryokan-led than Hakone.

You want the ritual, not the resort

Choose a small town with public bathhouses you can walk between. Kinosaki Onsen is the leading example: stay in any ryokan, get the wooden geta sandals at check-in, and use your room key to access all the public baths in the town as part of the stay. Currently six are operating; Satono-yu near the station has been closed for renovations since 1 April 2024, with no announced reopening as of May 2026. The remaining baths, from the cave-shaped Mandara-yu to the riverside Ichino-yu, give an evening’s worth of variation in water and atmosphere.

Shibu Onsen in Nagano operates a similar nine-bath circuit, with overnight ryokan guests given a key that opens the doors of all nine outdoor baths along a stone-paved street. It’s older, smaller and steeper than Kinosaki and trades the polish for atmosphere. Nozawa Onsen, also in Nagano, runs thirteen free public baths funded by the village; the entrance is a literal donation box.

You want history you can soak in

Dogo Onsen in Matsuyama, Ehime, runs to roughly 3,000 years of recorded use, making it one of the oldest documented bathing sites in Japan. The Dogo Onsen Honkan main bathhouse, the wooden three-storey building photographed here, was designated a National Important Cultural Property in December 1994 (the first public bathhouse to receive the designation) and reopened in full on 11 July 2024 after five and a half years of conservation repair, per the Honkan’s official site. Kami-no-Yu opens at 06:00 and closes at 23:00 with last entry at 22:30; the second-floor seating, Tama-no-yu and the private rooms keep slightly shorter hours, all listed at dogo.jp/en. The building is the inspiration cited for the bathhouse in Spirited Away, although Studio Ghibli has pointed out the resemblance is partial.

Arima Onsen, near Kobe, is the other historic heavyweight, a thousand-year-old hill-town bathing site whose kinsen “gold spring” runs visibly red-brown from iron content. The town is small and has good day-trip access from Osaka or Kobe; staying overnight gets you the older atmosphere after the day visitors leave.

You want geothermal spectacle, not just bathing

Beppu in Oita Prefecture is the largest by water volume; the city produces a staggering output across thousands of registered sources, and the famous Beppu Hells (jigoku) are eight separately coloured geothermal pools open as paid attractions rather than baths. You can do a Hells tour and a soak on the same day. The local tourism information centre at Beppu Station maintains current opening hours and admission prices, which were revised in October 2025 for the Hells admission scheme; verify on enjoyonsen.city.beppu-jp.com before booking.

Noboribetsu in Hokkaido is the northern equivalent: a town built around the steaming, ochre-coloured “Hell Valley” (Jigokudani) crater, with mineral water variety unmatched anywhere in Japan (the locals advertise nine of the eleven main types, all in one town). The Oyunuma pond runs at around 50°C at the surface and feeds a stream you can walk to and dip your feet in.

You want quiet, hard-to-reach, deeply rural

Nyuto Onsenkyo in Akita Prefecture is the gold standard. Seven separate ryokan are scattered through the beech forest of Towada-Hachimantai National Park, each with its own water source and milky alkaline pools; the historical Tsuru-no-yu is the photogenic favourite, a 350-plus-year-old timbered bathhouse with mixed and gender-separated baths fed from the same source. You’ll need a bus from Tazawako Station; book the ryokan months ahead. Kurokawa Onsen in Kumamoto is the other quiet-classic, a small Aso-area town that earned its reputation by collectively refusing the 1980s Japanese bubble-era development boom. The nyuto tegata is a wooden bath-pass tag (¥1,500 last verified, includes three baths from a list of around two dozen affiliated ryokan); 2026 is the pass’s 40th anniversary year per the Kurokawa Onsen Tourism Association site.

Yufuin, twenty-five minutes by train from Beppu, splits the difference: rural feel, Mt Yufu backdrop, accessible enough for a half-day visit but quiet enough to sleep through.

Eating around an onsen

Onsen and food are wound together in ways that surprise first-time visitors. The geothermal water cooks: onsen tamago, the half-set egg whose white is barely solid while the yolk stays creamy, comes from soaking eggs in 70°C source water for thirty minutes. Steamed buns, vegetables and even whole meals at some ryokan are cooked using the natural geothermal heat; Beppu has dedicated cooking pots (jigoku-mushi, “hell-steaming”) where you choose ingredients and a basket cooks them in a public steam vent.

If you stay at a ryokan, dinner and breakfast are usually included and they’re the centrepiece of the experience. Multi-course kaiseki dinners feature regional speciality and a dozen or more small dishes; expect to be in the dining room or your own private tatami room for an hour and a half minimum. Tell the ryokan in advance if you have allergies or dietary restrictions; “vegetarian” still confuses many traditional kitchens, but every ryokan I’ve stayed at has handled it gracefully when given two days’ notice.

When to come

Onsen are year-round, but the experience changes dramatically with the season. Winter is the iconic time: outdoor rotenburo with snow falling around you produce the contrast that the photography sells, and the cold air keeps you in the bath for longer than the heat alone would. December through February delivers this almost everywhere except in Okinawa (which has effectively no onsen culture, its volcanic geology being different).

Autumn is the runner-up, with maple foliage framing many outdoor baths in late October to mid-November in central Honshu (a few weeks earlier in Tohoku and Hokkaido). For a deeper read on autumn timing across the country, see my Japan autumn leaves guide. Spring brings cherry blossom around the bathing towns of Hakone, Atami, and parts of Kyoto’s perimeter; the timing varies by latitude and elevation, and the Japan flower calendar covers the rest of the bloom calendar from plum through wisteria.

Summer is the off-season for onsen, which makes it cheaper and less crowded. Outdoor baths still feel good in cooler highland onsen towns like Kusatsu, Nyuto and Hakone; in city locations like Atami, summer onsen is essentially a hot bath in hot weather, which is less compelling. If you’re trying to map your trip to weather, my best time to visit Japan guide breaks down each region month by month.

Snow monkeys are a different thing

The famous snow-monkey-in-an-onsen photographs come from Jigokudani Monkey Park, near Yudanaka and Shibu Onsen in Nagano. The monkeys bathe; you don’t bathe with them. A walk-in path of about 30 minutes from the bus drop takes you to the platform, where the macaques sit in a steaming pool surrounded by snow. The park is open year-round but only has the iconic snow imagery from December through early March. Combine it with an overnight at Shibu Onsen for the full experience: monkeys in the morning, public bath circuit in the evening.

Practical things to pack

A wash towel and a drying towel; some ryokan provide both, but the small wash towel for the bath is sometimes a buy-it-yourself item at the public sotoyu (around ¥150–300, often sold at reception). Cash for the public baths and vending machines, ideally with ¥100 coins. Hair tie if your hair is long. Glasses rather than contact lenses, because steam and the heat make contacts uncomfortable. A small mesh bag for your phone, wallet and keys to keep them organised in the locker. No swimsuit; you won’t be using it. No camera in the bathing area; this isn’t a soft rule, it’s universal.

If you stay at a ryokan, leave most of this at home. The ryokan provides the yukata, the wash towel, the drying towel, the soap and the shampoo; the hairdryer is in the changing room. The only things you might need to bring are a hair tie, a contact-lens case if you wear them, and your own toothbrush.

How an onsen visit fits into a wider trip

An overnight at an onsen is a good rest day in the middle of a city-heavy itinerary. The combination I’ve recommended most often is two nights in Tokyo, then a Romancecar to Hakone, then back to Tokyo or onward to Kyoto via the Tokaido Shinkansen. A second variant pairs an onsen night between Kyoto and Kanazawa via the Hokuriku Shinkansen, with Kinosaki as the rest stop on the way to the Sea of Japan coast.

For longer trips, build in two onsen overnights of contrasting kinds: one in a famous resort town (Hakone, Kusatsu) for the convenience, and one in a quieter rural ryokan (Nyuto, Kurokawa) for the depth. The contrast is the experience; each one alone misses something the other does well.

Onsen towns intersect naturally with several of the regional pieces on this site. The Hokkaido guide covers Noboribetsu and Jozankei in their northern context. The Tohoku guide covers Nyuto Onsenkyo, Ginzan Onsen and the Akita and Yamagata bathing tradition. The Mt Fuji and Hakone guide handles Hakone in the Tokyo-day-trip framework. The Hokuriku guide takes in Wakura Onsen and the Noto Peninsula bathing scene. The Kyoto guide notes Kurama and Kibune as quieter Kyoto-edge soaks. The Kyushu guide spends substantial time on Beppu, Yufuin and Kurokawa. And the Japan Rail Pass guide covers how to plan an onsen-heavy itinerary against the regional pass options. For a planner that crosses several of these, the Japan World Heritage sites guide traces the rail spine that connects most of the historical onsen towns to the cultural-tourism stops nearby.

One last thing nobody warns you about

The first onsen will feel awkward. The second onsen will feel less awkward. By the third, you’ll start noticing things: the way the regulars place their towel just so on the rim, the choreography of who washes where, the silent agreement to let the loudest tourist find their own way through it. Around the fourth, you’ll catch yourself wanting to come back, not for the photographs or the kaiseki, but for the specific kind of quiet that a hot bath produces when nobody is talking.

The list of named towns above is a starting menu, not a checklist. Pick one or two on your first trip, add another two on the next. Most of the great onsen are small enough that doing a town properly takes a single overnight; the value compounds when you can compare the silica-soft water of one place against the iron-rich, rust-coloured water of another, the post-bath beer at the riverside vending machine in Kinosaki against the post-bath cup of green tea in your tatami room at Nyuto. After enough of them, the question of which onsen is best becomes the wrong question. The right question is which one is right for tonight.