Visiting an onsen (Japanese hot spring) is one of the most memorable experiences Japan has to offer. Soaking in naturally heated mineral water, often surrounded by mountains or forest, is deeply relaxing and very Japanese. Here’s everything you need to know to enjoy your first onsen with confidence.
What Is an Onsen? An onsen is a hot spring bath fed by geothermally heated water. Japan sits on volcanic geology, so natural hot springs are found across the country — in dedicated onsen towns like Hakone, Beppu, and Kusatsu, at ryokan (traditional inns), and even in some city hotels. The water is rich in minerals and believed to have health benefits depending on the spring.
The Golden Rule: You Bathe Naked. This surprises many first-time visitors, but it’s non-negotiable — you do not wear a swimsuit in a traditional Japanese onsen. Bathing suits are considered unhygienic in shared hot spring water. You’re given a small towel for modesty when walking around, but it does not go into the water.
Men’s and Women’s Baths: Traditional onsen are separated by gender. Men’s bath (男湯) is usually marked with a blue curtain. Women’s bath (女湯) is usually marked with a red curtain. Some onsen also offer private family baths (家族風呂) which you can reserve — a good option if you’re shy or traveling as a couple.
The Tattoo Question: Many traditional onsen do not allow tattoos, even small ones. The situation is changing — some onsen now allow tattoos or have tattoo-friendly hours. Private baths often have no restrictions. Always check before visiting.
How to Use an Onsen Step by Step: First, pay the entrance fee and leave valuables in a locker. Enter the changing room and undress completely. Go to the washing area first — this is mandatory. Wash your entire body thoroughly at the shower station and rinse completely. Then enter the hot spring slowly — the water is hot, usually 40–43°C. Place your towel on your head or at the edge of the bath. Don’t let it touch the water. Relax, but don’t swim or splash. After soaking, exit, rinse off again, and dry off before getting dressed.
Tips: Don’t drink alcohol before onsen. Stay hydrated — drink water before and after. Most onsen have both indoor and outdoor baths — the outdoor ones are especially beautiful. Visit in the evening after a day of sightseeing for the best experience.
Onsen bathing sounds intimidating but becomes completely natural within minutes. Once you’ve tried it, you’ll understand why the Japanese consider it one of life’s great pleasures.
