What first-timers should know about onsen etiquette

Most people walk into their first onsen with good intentions and still manage to get it wrong. Not because the rules are complicated. Nobody just tells you what they are before you're already standing there in a towel.

Start with the rinse. Before you go anywhere near the main bath, find one of the low stools at the washing stations, sit down, and shower off completely. Soap, sweat, whatever you used on your hair that morning. It takes two minutes. Skipping it is the most obvious thing a first-timer can do, and everyone else in the room will know.

The towel comes in with you but doesn't go in the water. Fold it small, balance it on your head, or leave it at the pool's edge. Submerging it contaminates the shared bath. It also signals, fairly clearly, that you ignored the sign at the entrance.

If you're going to a traditional onsen rather than a hotel hot spring, don't bring a swimsuit. Bathing is done without clothing. Men and women use separate areas, and the noren curtains at the entrance show you which is which: blue for men, red for women. First-timers sometimes freeze up here. That's normal. It stops being a thing once you're actually in.

Long hair needs to be fully pinned up, not just gathered into a loose tie. It can't touch the surface of the water. Most front desks sell hair ties if you forgot one.

The temperature is where a lot of visitors get themselves into quiet trouble. Forty to forty-four degrees Celsius sounds fine until you're sitting in it. Ten minutes is enough for a first soak. Get out, drink water, cool down, then go back in if you feel steady. The rest area near the bath exists for exactly this. Soaking right after a big meal or a few drinks makes overheating worse, so wait at least an hour after eating and leave the alcohol for after.

Onsen are genuinely quiet spaces. Conversations happen but they stay low. Your phone doesn't come out at all. Not on silent, not face-down at the edge. Photography is off-limits throughout the bathing area, and pulling out a screen for any reason, even briefly, is the kind of thing people notice and remember.

Worth checking before you go: tattoo policy. A lot of onsen still prohibit them, and some will ask you to leave. Smaller family-run places and private-room onsen are usually more flexible. If you have visible tattoos and want to avoid the awkward conversation at the front desk, look specifically for tattoo-friendly facilities. They exist in most tourist areas and aren't hard to find.