How to Use a Japanese Onsen Without Getting It Wrong

The anxiety about Japanese hot springs is almost entirely front-loaded. People spend weeks worrying about an elaborate code they are certain they will violate, arrive, find that the code has about four rules, and then spend the rest of the trip trying to work another onsen into the itinerary.

It helps to know what an onsen actually is. Legally, it is a bath fed by naturally occurring geothermal water meeting defined mineral and temperature criteria — not simply a hot pool. A sentō is a public bath heated conventionally, common in cities, and follows the same etiquette. A rotenburo is an outdoor bath, which is what you want in winter. A kashikiri is a private bath booked by the hour or reserved for a family.

Here is what happens, in order.

The sequence

1. Pay and take a locker key at the entrance. Shoes come off before the changing area, into a rack or a small locker.
2. Find the right curtain. Red or pink with 女 for women, blue with 男 for men. The characters are the reliable signal; the colours occasionally are not.
3. Undress completely in the changing room and put everything in the locker. Swimwear is not worn and is not permitted.
4. Take the small towel with you. Leave the large one in the locker or on the shelf outside.
5. Wash thoroughly at the seated showers before entering any water. This is the rule that matters.
6. Get in slowly. The water is typically 40–44°C, which is hotter than most Western baths.
7. Keep the small towel out of the water. Fold it on your head, or rest it on the rim.
8. Get out before you need to. Fifteen minutes is a long soak. Sit on the edge and cool down between rounds.
9. Do not rinse afterwards if you want the minerals to do anything. Pat dry with the small towel before returning to the changing room.

Nudity, which is less of an issue than people expect

Onsen are single-sex and everyone is naked. There is no equivalent of a swimsuit compromise, and the water is generally opaque enough with minerals that it is a non-event within about ninety seconds.

The small towel — roughly the size of a hand towel — is the one concession. It is carried for modesty on the walk to the water and must not go in. Most people fold it on their head, which looks eccentric and is genuinely practical for a long soak.

Mixed-gender bathing (konyoku) still exists at a small number of rural and historic onsen, usually with a towel or bathing-garment allowance. It is now rare enough that you will not encounter it by accident.

Tattoos

This is the most-asked question and the answer has genuinely changed.

Historically, tattoos were associated with organised crime, and many facilities banned them outright. That is still true in places, but the picture in 2026 is far more mixed, with policies varying enormously between establishments.

Your options, roughly in order of reliability:

The blunt version: if you have visible tattoos and want a guaranteed onsen experience, book a private bath or a ryokan room with its own. It removes the question entirely and it is a better experience anyway.

What to actually avoid

The list of things that genuinely cause offence is short.

• Getting in without washing. As above.
• Putting the towel in the water.
• Swimming, splashing or diving. These are baths, not pools.
• Loud conversation. Quiet talk is fine; the volume is closer to a library than a spa.
• Phones and cameras anywhere past the changing room. This is absolute, and enforced.
• Long hair loose in the water. Tie it up.
• Drinking heavily before bathing. Hot water plus alcohol is a genuine medical risk, not a rule about manners.

Nobody minds if you are unsure where to put something, look briefly lost, or ask. Visitors are common and staff are used to explaining.

Practical matters

What is provided varies by price. Higher-end ryokan and day facilities supply everything — towels, soap, shampoo, razors, hairdryers. Budget sentō may provide nothing; take a small towel and a coin for the locker. When in doubt, take your own small towel.

Timing. Ryokan baths are busiest immediately after check-in and immediately before dinner. The best hours are early morning, and late evening after dinner service ends. Some facilities swap the men's and women's baths overnight so that both sets of guests see both — worth checking, since one is often better than the other.

Cost. A public onsen or sentō runs ¥400–900. A day facility with multiple baths, ¥800–2,500. A ryokan stay with meals and bath access, ¥25,000–60,000 per person.

Health. Skip the bath if you have a heart condition, are pregnant, or have open wounds — sulphurous water is not kind to either. Hydrate, and do not go straight from a hot bath into cold air if you have been in a long time.

Where to go

You do not need to travel far. There are notable onsen towns within easy reach of the main tourist route.

Kinosaki deserves the specific recommendation. Guests change into yukata and wooden geta at their ryokan and walk between seven public bathhouses along a willow-lined canal, and the whole town operates as a single distributed onsen. It is the most enjoyable version of the experience for a first-timer and works as a two-night detour from Kyoto.

Official resources

• Japan National Tourism Organization — regional onsen listings, including facilities that state tattoo policies.

Why it is worth the effort

Bathing in Japan is not a spa treatment and does not resemble one. It is an ordinary, daily, communal thing that people have been doing in the same water for centuries, and the small ritual around it — the washing, the quiet, the towel on the head, the slow walk back in a yukata — is a large part of why it works.

Fifteen minutes in water that came out of the ground hot, in silence, in the cold. It is difficult to argue with.

Book one night at a ryokan with a good bath even if it means rearranging the route. It is consistently the night people remember. Our complete Japan travel guide has more on where a ryokan night fits into a two-week itinerary.