Tōji and the Yuzu Bath: Japan's Winter Solstice Customs

Tōji (冬至), the winter solstice, falls around 21 or 22 December, and in Japan it is the day for a yuzu bath, yuzuyu (ゆず湯): whole yuzu citrus fruits floating in a hot bath. Many families also eat kabocha squash, and some eat foods with the sound n in their names for luck.

What you need to know

Tōji and the Yuzu Bath: Japan's Winter Solstice Customs

Tōji is not a public holiday, and nobody gets a day off, yet it is one of the most loved small customs of the Japanese winter. On the shortest day of the year, supermarkets pile up yellow yuzu by the entrance, public bathhouses float the fruit in their big tubs, and families drop a few into the bath at home so the whole bathroom smells of citrus. At dinner, a dish of simmered kabocha often appears, sometimes with azuki beans. The reasons people give are a mix of old wordplay, folk wisdom about staying warm and healthy, and simple pleasure in a fragrant bath on a cold night. This guide explains when tōji is, what the yuzu bath is and how to take one at home or at a sentō, the foods of the day and the lucky n foods, the explanations people commonly give, the Japanese words and short conversations you will hear, and a few learner mistakes, such as confusing tōji with its many homophones.

Tōji, the winter solstice, falls around 21 or 22 December

The yuzu bath, yuzuyu, is the signature custom of the day

Kabocha and foods with n in their names are eaten for health and luck

Many public bathhouses run a yuzu bath on the day; customs vary

The solstice in four words

Four words cover the whole day: the toasty, warm feeling of a yuzu bath, the name of the day itself, the dish that appears at dinner, and the fact that makes it special, the shortest day of the year. Pokapoka, the first word on the cards, is a sound-symbolic word for being pleasantly warm, and it is almost always used about baths, sunshine and warm drinks in winter.

Four picture cards: a steaming bath with yellow citrus, a winter sun low on the horizon, a bowl of simmered squash, and a short day turning to night.
A warm yuzu bath, the solstice, simmered kabocha and the shortest day: the four words of tōji.
JapaneseRomajiMeaning
ゆず湯でぽかぽかYuzuyu de pokapokaToasty warm in a yuzu bath
冬至tōjithe winter solstice
かぼちゃの煮物kabocha no nimonosimmered kabocha squash
一番短い日ichiban mijikai hithe shortest day

When tōji is, and what it means

Tōji is one of the 24 seasonal divisions, nijūshi sekki, of the traditional East Asian calendar. It falls around 21 or 22 December, and its summer opposite is geshi, the summer solstice. Because the days begin to lengthen again after tōji, it has long been seen as a turning point, a moment when the light starts to come back.

One expression captures that feeling: ichiyō raifuku, literally one yang returns. It means that after a hard time things start to improve, and it is used both about the solstice and, more broadly, as a hopeful phrase around the New Year. You may also see it on charms sold at some shrines around this time.

JapaneseRomajiMeaning
冬至は一年で一番昼が短い日です。Tōji wa ichinen de ichiban hiru ga mijikai hi desu.Tōji is the day with the shortest daylight of the year.
夏至geshithe summer solstice
日が短くなったね。Hi ga mijikaku natta ne.The days have got short, haven't they?
これから日が長くなるね。Kore kara hi ga nagaku naru ne.The days will get longer from now on.
一陽来復ichiyō raifukuthe light returns; things turn for the better

The yuzu bath at home

Yuzu is a small, bumpy yellow citrus with a strong scent and very little juice. For a yuzu bath, people float several whole fruits in the hot water. Some cut them in half or put slices in a mesh bag for a stronger scent, but cut fruit can make sensitive skin tingle, so whole fruit is the gentle option, especially for children.

The explanations people give are a mix of folk wisdom and wordplay. The scent and oils are said to warm the body and help you get through winter without a cold. The wordplay links tōji with 湯治 (tōji), a healing stay at a hot spring, and yuzu with 融通 (yūzū), being flexible in life. These are popular explanations rather than recorded history, and families vary.

JapaneseRomajiMeaning
ゆず湯に入るyuzuyu ni hairuto take a yuzu bath
ゆずを丸ごと浮かべるyuzu o marugoto ukaberuto float whole yuzu
いい香り!Ii kaori!What a lovely smell!
体が温まるね。Karada ga atatamaru ne.It really warms you up.
これで風邪をひかないね。Kore de kaze o hikanai ne.Now we won't catch a cold. (said with a smile)
肌がちょっとぴりぴりする。Hada ga chotto piripiri suru.My skin is tingling a little.

At the sentō on the shortest day

Many sentō, neighbourhood public bathhouses, float yuzu in the big tubs on tōji, and some run the yuzu bath for a few days around it. Even people who rarely visit a sentō sometimes go that evening. If you go, the usual manners apply: wash and rinse at the taps before getting into the bath, keep your towel out of the water, and leave the fruit floating. Some bathhouses ask people not to squeeze or break the yuzu, because broken fruit irritates other bathers' skin.

Bath time is also small-talk time. Regulars often chat with newcomers in the water, and the yuzu gives you an easy topic.

JapaneseRomajiMeaning
今日はゆず湯ですか。Kyō wa yuzuyu desu ka.Is it a yuzu bath today?
ゆずは潰さないでくださいね。Yuzu wa tsubusanaide kudasai ne.Staff: Please don't squash the yuzu.
いい香りですね。Ii kaori desu ne.It smells lovely, doesn't it?
毎年来るんですか。Maitoshi kuru n desu ka.Do you come every year?

Kabocha, azuki and the lucky n foods

The food of tōji is kabocha, Japanese squash, usually simmered with soy sauce and sugar until soft. In some homes it is cooked with sweet azuki beans as itoko-ni, and in some regions people eat azuki porridge. Kabocha is a summer crop that keeps well, so it was valuable in midwinter, and eating it on tōji is said to keep you healthy.

Another custom is eating foods whose names contain the sound n, said to bring un, luck. A set often called the seven foods of tōji includes nankin (the western Japanese name for kabocha), renkon, ninjin, ginnan, kinkan, kanten and udon, which in older speech is undon. Few families eat all seven; it is a playful custom, and regional practice differs.

In a warm home kitchen on a winter evening, a young man and his host mother serve simmered kabocha into small bowls, a basket of yuzu on the counter.
Simmered kabocha, a basket of yuzu and a warm kitchen: dinner on the shortest day.
JapaneseRomajiMeaning
冬至にはかぼちゃを食べます。Tōji ni wa kabocha o tabemasu.On tōji, we eat kabocha.
なんきんnankinkabocha (a western Japan name)
れんこんrenkonlotus root
にんじんninjincarrot
ぎんなんginnanginkgo nuts
「ん」がつく食べ物で運がつくN ga tsuku tabemono de un ga tsukuFoods with n bring luck

Mini dialogue: tōji with a host family

If you stay with a Japanese family in December, the solstice may come up casually in the afternoon, often when someone brings home a bag of yuzu from the supermarket. Here a host mother tells a student about the evening plan. Notice how she explains the custom in plain, casual Japanese, and how the student answers politely but warmly.

JapaneseRomajiMeaning
今日は冬至だから、ゆず湯にしようか。Kyō wa tōji da kara, yuzuyu ni shiyō ka.Host mother: It's the solstice today, so shall we do a yuzu bath?
ゆず湯って何ですか。Yuzuyu tte nan desu ka.You: What's a yuzu bath?
お風呂にゆずを浮かべるの。体が温まるよ。Ofuro ni yuzu o ukaberu no. Karada ga atatamaru yo.Host mother: You float yuzu in the bath. It warms you up.
へえ、いい香りがしそうですね。Hē, ii kaori ga shisō desu ne.You: Oh, that sounds like it would smell nice.
晩ご飯はかぼちゃの煮物ね。Bangohan wa kabocha no nimono ne.Host mother: And dinner is simmered kabocha.
楽しみです。お先にお風呂、いただきます。Tanoshimi desu. Osaki ni ofuro, itadakimasu.You: I can't wait. I'll take my bath first, then.

Words to keep apart, and common mistakes

  • 冬至 (tōji, the solstice), 湯治 (tōji, a healing hot-spring stay) and 当時 (tōji, at that time) are all read tōji. Context separates them; the long ō is the same in each.
  • Toji with a short o is a different word, 閉じ, as in the verb tojiru, to close. Keep the ō long.
  • Saying yuzuyu o nomu. Yuzuyu is a bath; you hairu it. The hot drink is yuzucha, yuzu tea.
  • Calling yuzu a mikan. Mikan is the sweet mandarin you eat at the kotatsu; yuzu is too sour to eat on its own.
  • Squeezing the fruit at a sentō. Leave it whole unless the staff say otherwise.
  • Expecting the day off. Tōji is a custom, not a public holiday.

A solstice-week routine with Mocchi

Type /kanji 冬 to Mocchi and you get the kanji's meaning, readings and common words, including 冬至 and 冬休み. Then ask Mocchi to make flashcards for the yuzu bath and n-food words with /create-flashcards, choosing a photo for each, and review them with /review-flashcards over the week of the solstice. Mocchi brings the cards you find hard back sooner and remembers them for next winter.

Because the long vowel in tōji is the whole difference between the solstice and closing a book, spend a few minutes on long vowels in the pronunciation coach too. Listen slowly, record yourself, and check the rhythm score.

Key points

A practical way to improve

Start with the sounds, because tōji needs a clear long ō: say tōji, toshi and tōjitsu slowly and feel the difference in length. Then practise three lines you can use on the day: kyō wa tōji da ne, it's the solstice today; yuzuyu ni hairō ka, shall we have a yuzu bath?; and kabocha no nimono, oishii ne, this simmered kabocha is delicious. Say them as if talking to a host family or a flatmate. Next, describe the custom in two sentences for a friend at home, in Japanese: what people put in the bath and why. Finally, open AI Sensei, choose the seasonal events topic and ask the Sensei to play a host mother explaining tōji to you. Ask questions, and check the session report for vocabulary. Mocchi keeps track of the words you missed for a later review.

  1. 1

    Choose one clear goal

    Focus each session on a situation or skill you can actually use.

  2. 2

    Practice actively

    Say complete answers aloud instead of only reading or recognizing Japanese.

  3. 3

    Review and repeat

    Keep useful corrections and revisit the same skill until it feels natural.

FAQ

Frequently asked questions

When is tōji in Japan?

Tōji is the day of the winter solstice, which falls around 21 or 22 December depending on the year. It is one of the 24 seasonal divisions of the traditional calendar and the day with the shortest daylight in Japan.

Why do Japanese people take a yuzu bath on the winter solstice?

People commonly give several reasons. The fragrant fruit is said to warm the body and help you avoid colds in winter. There is also old wordplay: tōji sounds like 湯治, a healing hot-spring stay, and yuzu sounds like yūzū, flexibility. Reasons vary, and many people simply enjoy it.

Why do people eat kabocha on tōji?

Kabocha squash keeps well into winter and is rich in nutrients, so it was a valuable vegetable in the cold season, and eating it on tōji is said to keep you healthy. It also fits the custom of eating foods with the sound n, because in western Japan it is often called nankin.

Can I take a yuzu bath at a public bathhouse?

Often, yes. Many sentō, public bathhouses, float yuzu in their baths on tōji, sometimes over a few days. Check with your local bathhouse, follow the usual bathing manners, and do not squeeze or break the fruit unless the staff say it is fine.

Ask a host family about tōji, out loud

Ask AI Sensei to play a host mother on the winter solstice. Ask what a yuzu bath is, talk about kabocha and lucky n foods, and say ofuro itadakimasu at the end.