Onsen in Japan: the guide for first-timers (and people who got it wrong)

Onsen is one of those Japan experiences that shows up in every travel guide and rarely gets done properly. Part of the problem is that articles describe the outcome — hot water, mountain views, peace and quiet — without explaining the process. And the process, the first time, is intimidating. Undressing in front of strangers in a communal bath, following a set of unwritten rules you don’t know, carries a real element of social anxiety — especially for anyone coming from Europe or the Americas.

I’ve been going to onsen regularly for years — first out of curiosity, then out of habit, and now with my three kids — and my one regret isn’t having gone too soon. It’s having waited so long the first time because I didn’t know what to expect. This guide tries to fix that.

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What an onsen is, and how it differs from a sentō

An onsen (温泉) is a thermal bath fed by natural geothermal water. Japan has over 27,000 officially classified hot spring sources, spread across the country but concentrated in volcanic zones: Hokkaido, northern Honshu, Kyushu, and — for anyone based in Tokyo — the Hakone area and the Izu Peninsula.

What makes onsen special isn’t just the water temperature (usually 38–44°C) but the mineral composition: bicarbonate, sulfur, iron, chloride… Each region has waters with different characteristics and properties. Hakone has sulfurous, acidic waters with that distinctive egg smell. Atami’s waters are more saline. The onsen in Beppu, Kyushu, have such a wide variety of compositions that the area has built an entire tourism industry around them.

A sentō (銭湯) is different: it’s a communal public bath with artificially heated tap water, no geothermal origin. They’ve existed for centuries as public hygiene facilities in cities where not everyone had a bath at home. Many still operate today, especially in Tokyo — cheap (¥500–600 entry) and genuine as a neighbourhood experience, but they’re not onsen. Some modern sentō add mineral salts or jacuzzi options to simulate the experience, but legally they can’t call themselves onsen.

A super sentō is a commercial hybrid: larger, with multiple bath types, sauna, restaurant, rest area and, sometimes, real or imported thermal water. It’s the most accessible option for anyone in Tokyo who doesn’t want to travel.

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The tattoo question

It’s the first thing almost every Western visitor asks about, and for good reason: onsen policy on tattoos in Japan is restrictive, confusing, and changing more slowly than it’s sometimes made out to be.

The real situation in 2026: most traditional onsen and establishments that cater to conservative Japanese clientele still prohibit tattoos — regardless of size, style or cultural meaning. It’s not an arbitrary rule. It has historical roots in the association between tattoos and organized crime in Japan, and many establishments maintain it both out of genuine conviction and to avoid making other bathers uncomfortable.

That said, there are exceptions:

Private rooms (貸切風呂, kashikiri-buro): many ryokan and some public onsen offer private baths that you rent by the hour. In a private bath, tattoo restrictions don’t apply because it’s just you (or your group) in the space. This is the most common and comfortable solution for people with tattoos.

That said, in practice there’s a big difference between a small discrete tattoo and one that covers an entire arm or leg. I have a small tattoo on my back and in years of going to onsen I’ve never had a problem — nobody has pointed it out, asked me to leave, or created an awkward scene. Maybe nobody noticed. Maybe they noticed and said nothing. But a large, visible tattoo in a prominent location is a different matter: some establishments will simply turn you away, and at those that don’t explicitly prohibit it, it may make other bathers uncomfortable. The nuance matters.

Establishments with explicitly open policies: they exist and there are more every year. Yunessun in Hakone is the best-known example near Tokyo (more on this below). Some super sentō in Tokyo like Thermae-Yu in Shinjuku allow entry with small tattoos covered by adhesive patches (which they sell), or have specific baths reserved for tattooed guests.

Ryokan with in-room baths: many modern ryokan include a private onsen bath in the room itself. No restrictions whatsoever.

The practical advice: check the policy before you go. Most establishments state it clearly on their website, sometimes with explicit icons. If you have large or prominently placed tattoos, focus your search on kashikiri-buro or openly welcoming establishments. It’s not a lost cause — it just requires a bit more planning.

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The basic etiquette

Onsen rules aren’t complicated, but if nobody explains them beforehand, the first visit can feel uncomfortable. Here they are:

Before entering the bath: Remove your shoes at the entrance (where applicable). Pay the entry fee. Pick up a small towel if you haven’t brought your own or if the establishment provides one. Enter the changing room for your gender — in Japanese: 男 (otoko, men) and 女 (onna, women). Leave all clothing and belongings in the locker or basket. Do not enter the bath area with clothes or underwear.

In the washing area: Before getting into the onsen, you must shower. There are rows of low individual shower stations with a stool and mirror — the custom is to sit down, lather up properly and rinse off before entering the communal water. This is not optional or decorative: it’s the most important part of onsen etiquette, because the onsen isn’t for washing — it’s for bathing. The communal water is shared. Leave the shower station clean when you’re done.

In the bath: The small towel doesn’t go in the water — fold it and rest it on your head or on the bath edge. Long hair should be tied up so it doesn’t fall in. You don’t need to talk; onsen is a quiet space by default, though quiet conversation isn’t forbidden. Don’t submerge your face. Don’t swim. Don’t splash.

A practical note on temperature: Onsen water can be 40–43°C or more. If you’re not used to it, your body takes a couple of minutes to adjust. Enter slowly, sit down, wait. If you feel dizzy or heavy-headed, get out of the water, sit on the edge and drink some water. It’s normal the first time, especially in summer or if you’ve just arrived in Japan. Stay hydrated before and after.

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Types of onsen by format

Ryokan with onsen (旅館): the full experience. A ryokan is a traditional Japanese inn that includes dinner and breakfast, a tatami room, and access to the thermal baths. It’s expensive (¥15,000–40,000 per person per night for mid-range options, considerably more at the high end) but it’s an experience unlike anything else you can do in Japan. If you’re only doing this once in your life, it’s worth it.

Higaeri onsen (日帰り温泉): a day visit with no overnight stay. Many onsen — including those at some ryokan — open their facilities for short visits, with entry fees typically ¥800–1,500. It’s the most accessible option if you can’t or don’t want to stay overnight. The bathing experience is the same; what you miss is the atmosphere of the evening, the kaiseki dinner and the morning in yukata.

Rotenburo (露天風呂): outdoor bath. It can be at a ryokan, a public onsen, or both. It’s what most people picture when they think of Japanese onsen: hot water under the open sky, surrounded by nature, with views of mountains or forest. In winter, bathing in a rotenburo with snow falling is one of those experiences that brings people back to Japan.

Kashikiri-buro (貸切風呂): private rental bath. Usually ¥1,000–2,500 for 45–60 minutes. Ideal for couples, families with young children, or people with tattoos. Book ahead if you can.

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The most accessible options from Tokyo and Yokohama

Hakone: the obvious choice, and for good reason

Hakone is the most accessible onsen area from Tokyo, and it knows it: it’s 90 minutes on the Romancecar from Shinjuku, or via JR connections from anywhere in the city. The scenery is spectacular — Lake Ashi, Mount Fuji on clear days, cedar forests — and the onsen infrastructure is among the most developed in the country. If you have a JR Pass, the JR leg to Odawara (the gateway to Hakone) is covered; from there the Hakone Free Pass covers the rest of the loop. If you don’t have a pass, here’s an honest look at when the JR Pass actually makes sense.

Hakone’s waters are primarily sulfurous and acidic. That sulphur smell — like eggs — when you walk into some establishments is a sign that the water is genuine and from a nearby volcanic source, not imported or diluted.

For a day visit without a ryokan, the Gora and Kowakidani areas have several public onsen with higaeri options. Entry ¥1,000–1,500. If you want to combine onsen with an overnight stay, the range of ryokan is enormous and covers all budgets — from basic options to luxury establishments facing Fuji.

Yunessun (ユネッサン) deserves a special mention because it’s unlike any other onsen in the area: it’s a water-park-style complex with themed baths (wine, sake, coffee, green tea…), water slides, and — separate from the swimwear area — a traditional onsen section with real thermal water. The swimwear section allows tattoos and is very popular with families with children. It’s not the most authentic onsen experience, but it’s fun, well located in Hakone, and solves the tattoo problem without needing a private bath.

Use the Japan trip budget calculator to work out whether the trip fits into your overall costs.

Atami: thermal city a 40-minute Shinkansen ride away

Atami (熱海) is on the coast of the Izu Peninsula, 40 minutes from Tokyo by Shinkansen (¥3,760 on Kodama or Hikari). It’s a spa town with decades of history as a Japanese tourist destination — somewhat faded in the 1990s and now recovering with a new generation of visitors.

Atami’s waters are more saline than Hakone’s, which gives them a different feel and colour. The city has dozens of onsen spread across the hillside that slopes down to the sea, from modest establishments to high-end ryokan with bay views.

I’ve stayed in a hotel in Atami with a private rotenburo in the room, and it’s one of the best options in the area for combining comfort with a genuine onsen: thermal water, sea views from the terrace, and no need to leave the room to enjoy it. It’s worth looking for that option when booking, even if it costs a bit more — I no longer book in Atami (or many other onsen areas) without checking first whether there’s a room with a rotenburo.

For a day visit, Atami is an excellent option if you already have a JR Pass — the Shinkansen is covered. Without a pass, the transport cost makes a higaeri-onsen here more expensive than Hakone.

Manyo Club: city onsen with kashikiri

Manyo Club (万葉倶楽部) is a chain of urban onsen worth singling out because it solves several problems at once. They have locations in Yokohama (right by the harbour, in Minato Mirai), Tokyo and other cities, and offer an unusual combination: thermal water transported from Yumoto (Hakone) in tankers, communal onsen areas, and kashikiri-buro available to reserve.

The Yokohama location in particular has harbour views and is open 24 hours. You can go at night after dinner, use a private bath, and take the metro home. Entry is around ¥2,800 (plus a late-night surcharge after a certain hour), and the kashikiri is reserved and paid separately.

For visitors in Tokyo or Yokohama who don’t want to travel to Hakone, Manyo Club is the closest thing to a real onsen in the city.

Options within Tokyo: when you don’t want to leave the city

Thermae-Yu (テルマー湯) in Shinjuku is the most central super sentō in Tokyo for this purpose. It has thermal water imported from Niigata, several sauna types, a rest area, and a tattoo policy that allows entry with small tattoos covered by adhesive patches (which they sell) or access to certain baths for larger tattoos. Open until 9am the following day. Entry from ¥1,200 (plus a late surcharge after a certain hour).

Spa LaQua (スパ ラクーア) at Tokyo Dome City is another urban option with real thermal water (sourced from 1,700 metres depth). More focused on relaxation than traditional onsen, with a rest lounge, restaurant and massage options. Entry is pricier (around ¥2,900) but the location is convenient if you’re already in the Bunkyo area.

For something more authentic and cheaper, neighbourhood sentō in Tokyo offer a different experience: no thermal water, but the atmosphere of a Japanese public bath — often in a building with decades of history. Typical entry ¥500–600. There are good ones in areas like Yanaka, Asakusa or Shimokitazawa worth seeking out.

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Ryokan or day trip?

If it’s your first time at an onsen, my recommendation is to start with a kashikiri-buro before diving into a communal bath. The reason is practical: in a private bath there’s nobody else watching, you can take all the time you need to understand the ritual, shower at your own pace, get into the water when you’re ready and leave whenever you want. You take the social pressure out of the first time and just focus on the experience itself. Once you’ve done that once, the communal bath doesn’t feel daunting.

Manyo Club in Yokohama or Hakone are good options for this first kashikiri without needing to plan a long trip. Once you’ve got the first time out of the way, the natural next step is a higaeri-onsen in Hakone or Atami, and then, if you want the full experience, a night at a ryokan.

On hotels with in-room rotenburo: whenever I’m looking for accommodation in onsen areas — Atami, Hakone, the Izu Peninsula — the first thing I check is whether there are rooms with a private rotenburo. It generally costs more, but the difference is worth it: the thermal water is available whenever you want, you can use it at midnight or first thing in the morning, and you’re not tied to the communal bath timetable. If the budget allows, it’s the option I recommend most for a first ryokan night.

For the ryokan night itself, Hakone is the most convenient option for anyone based in Tokyo or Yokohama. If you can go further, the Izu Peninsula has excellent ryokan with less crowding than Hakone and sea views. Kinosaki Onsen, at the western edge of Honshu, is possibly the most beautiful onsen town in Japan — but that requires a dedicated trip.

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When to go

Onsen doesn’t have a bad season, but there are nuances:

Winter (December–February) is the most iconic season for rotenburo: the contrast between the heat of the water and the cold air outside is at its peak. In Hakone, snowy days are exceptional but not guaranteed. Winter weekends in Hakone are the busiest of the year — go on a weekday if you can.

Autumn (October–November) pairs well with the momiji (autumn foliage). Several onsen in Hakone and Nikko have views over forests that turn spectacular in November.

Spring (March–May) has the advantage of pleasant weather for the surrounding areas. The combination of onsen and cherry blossom at some ryokan in the Izu area is hard to beat.

Summer is the least intuitive season for onsen — hot water when it’s 35°C outside? — but rotenburo make sense even in summer if the establishment has breezy areas, cool water pools or is at altitude. Yunessun in Hakone has outdoor pools that make summer very manageable. If you’re travelling in these months, our guide to Japanese summer travel covers what to expect month by month.

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FAQ

Can you go to an onsen without speaking Japanese? Yes. Tourist-oriented establishments have instructions in English. The more local ones don’t, but the logic is visual: follow what the people around you do and you won’t go far wrong. The most important rule — shower before getting in — is usually indicated with pictograms.

Can children go? It depends on the age and establishment, but generally yes. Young children usually go with their parent to the corresponding gender bath. From a certain age (varies, but roughly 6–10) they’re expected to use their gender’s bath. Some onsen have minimum age restrictions — check beforehand. Kashikiri-buro and Yunessun are hassle-free options for families.

Do you need to bring a towel? Many establishments include or rent towels, but it’s worth checking beforehand. For a higaeri-onsen, you often pay a base entry fee and rent or buy the towel separately. Bringing your own small towel (hand-towel size) is always a good idea.

How long does a visit take? For a higaeri-onsen, allow 1.5 to 3 hours. In that time you can shower, enjoy the different baths at your own pace, use the rest area and not feel rushed. At a ryokan the rhythm is different: the first bath is usually before dinner and the second the following morning.

Do you need a reservation? For higaeri-onsen, generally no reservation needed — you show up, pay and enter. On busy weekend days during peak season some popular establishments may have a wait. For ryokan, always book ahead, especially in autumn and winter. For kashikiri-buro, book at least a couple of days in advance.

How much does it cost? A basic higaeri-onsen: ¥800–1,500. Super sentō in Tokyo: ¥1,200–3,000. One night at a ryokan with half board: from ¥12,000 to ¥50,000 per person, and considerably more at the high end. Use the Japan trip budget calculator to factor this into your overall travel costs.

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My first onsen was in Hakone, on a Sunday in November with the trees just starting to turn. I arrived with no clear idea of what to expect, sat on the shower stool feeling like I was getting everything wrong, and twenty minutes later was in the rotenburo looking at the forest and understanding why the Japanese have been doing this for centuries. There isn’t much more to explain. You just have to go.

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Prices and policies updated June 2026. Tattoo rules vary by establishment and can change — always check the official website before visiting.