A Historic Name Associated with Minamoto no Yoritomo
The name Shirahata, meaning “white banner,” is traditionally said to refer to the white banners associated with the Minamoto clan.
According to local tradition, Minamoto no Yoritomo, founder of Japan’s Kamakura shogunate, visited Kusatsu and bathed in the spring here. The bath was once known as Gozano-yu, and the present name Shirahata-no-yu came into use after the Meiji period.
Whether the Yoritomo story is historically verifiable remains uncertain, but the legend reflects the long-standing reputation of Kusatsu’s hot springs and their association with prominent historical figures.
The water itself is famously intense. After experiencing the high temperature and strongly acidic character of the bath, some visitors may jokingly feel that the name “Shirahata,” or “white flag,” is particularly appropriate.
The Powerful Shirahata Hot Spring Source
Shirahata-no-yu uses the Shirahata Source, which is distinctive among Kusatsu’s major hot spring sources for its characteristic slightly cloudy appearance.
The spring is classified as an acidic sulfur-aluminum sulfate-chloride spring, with a pH of approximately 2.1. The source temperature is above 50°C (122°F), so the bathing pools are divided into two temperatures: a hot bath and a warm bath. Even the “warm” bath can feel quite hot to visitors unfamiliar with Japanese hot springs.
Kusatsu’s strongly acidic water has traditionally been valued for its cleansing properties, and various therapeutic benefits have historically been associated with the springs. These traditional descriptions form part of Kusatsu’s long history as a hot spring treatment destination rather than a substitute for modern medical care.
When entering the bath, visitors can notice the distinctive sulfur aroma and a slight tingling sensation on the skin. These are characteristic features of a strongly acidic sulfur spring. After bathing, many people appreciate the refreshing sensation and lingering warmth.
The Communal Bathhouse Culture of Kusatsu
Kusatsu Onsen has 19 communal bathhouses located throughout the town. These facilities have traditionally served local residents and are maintained with the support and care of the local community.
Of these, three communal baths are particularly accessible to tourists: Shirahata-no-yu, Jizo-no-yu, and Chiyo-no-yu.
Respecting Local Bathing Customs
Many traditional communal bathhouses in Kusatsu have relatively simple facilities and may not provide conveniences such as individual lockers with locks or shower areas.
Visitors should therefore follow basic Japanese bathing etiquette. Wash or rinse your body thoroughly before entering the bath, never place a towel in the bathwater, and take care not to splash water into the changing area.
These bathhouses remain part of the daily lives of local residents. Respecting the local community, keeping noise to a minimum, and leaving the facility clean are essential parts of enjoying the experience.
Gozano-yu — A Day-Use Bathhouse with Historic Character
Located directly in front of the Yubatake, Gozano-yu is a modern day-use bathhouse reconstructed in the style of the communal baths that existed here during the Edo and Meiji periods.
The building emphasizes traditional wooden architecture, including a roof made using wooden shingles known as tonton-buki and plaster walls that recreate the atmosphere of historic Kusatsu.
Two Distinctive Bathing Areas
Gozano-yu has two bathing areas, Kino-yu and Ishi-no-yu, which alternate between men’s and women’s use each day.
Kino-yu features traditional wooden materials such as Japanese cypress, hiba cypress, and cedar, creating a warm and natural atmosphere.
Ishi-no-yu, by contrast, uses substantial granite and has a more solid, understated character. Together, the two spaces allow visitors to experience different aspects of traditional Japanese bathhouse design.
Two Different Hot Spring Sources
Gozano-yu also allows visitors to experience two different sources: the Yubatake Source and the Bandai Source.
The Yubatake Source is the famous central source associated with Kusatsu’s iconic Yubatake. The strongly acidic sulfur spring has a pH of around 2.0 and is one of the defining elements of the town’s hot spring culture.
The Bandai Source began flowing from a sulfur mine tunnel in 1970. Its natural temperature is approximately 95°C (203°F), and heat-exchange equipment is used to bring the water to a suitable bathing temperature.
Experience Traditional Hot Spring Culture
Gozano-yu also introduces visitors to elements of traditional toji, the Japanese practice of staying at a hot spring resort for bathing and rest.
Visitors can also rent a yukata, a lightweight traditional Japanese robe, and walk around the Yubatake area after bathing. The sight of steam rising from the hot spring channels, particularly after dark when the Yubatake is illuminated, creates an atmospheric view of Kusatsu.
Explore Kusatsu with the Three-Bath Pass
Visitors can experience three of Kusatsu’s best-known day-use hot spring facilities with the Choina Three-Bath Tour Pass.
The pass covers Shirahata-no-yu’s neighboring Gozano-yu, Otaki-no-yu, and Sainokawara Open-Air Bath, allowing visitors to enjoy different bathing environments and hot spring sources during their stay.
Sainokawara Open-Air Bath is particularly impressive for its enormous outdoor bathing area surrounded by nature. Seasonal scenery, from autumn foliage to snowy winter landscapes, adds a different atmosphere throughout the year.
Otaki-no-yu
Otaki-no-yu is another of Kusatsu’s major day-use bathing facilities. It uses the Nikawa Source, one of the area’s famous hot spring sources, which is traditionally known as the “Beauty Bath.”
Kusatsu’s Traditional Awase-yu
The facility’s signature attraction is Awase-yu, a traditional bathing method in which hot spring water flows through a series of pools and gradually cools naturally.
The pools are arranged at different temperatures, allowing bathers to start with a relatively cooler pool and gradually move toward hotter water as their bodies become accustomed to the heat.
Separate Awase-yu areas are provided for men and women, creating atmospheric spaces filled with steam where visitors can experience an important part of Kusatsu’s traditional bathing culture.
How to Bathe Comfortably in Kusatsu’s Hot Springs
Kusatsu’s hot spring water is strongly acidic, with a pH of around 2, and many of the baths are also very hot. Visitors should therefore take care when entering the water.
Before Entering
Begin by pouring some hot spring water over your body to gradually adjust to the temperature. Starting with a partial bath can also help you acclimatize before immersing yourself more deeply.
A first soak of approximately 5–10 minutes is a useful guideline, but there is no need to remain in the bath if you feel uncomfortable.
After Bathing
Drink plenty of water and take time to rest after bathing. Avoid entering the bath immediately after drinking alcohol, eating a large meal, or exercising vigorously.
Because the water is both hot and strongly acidic, shorter bathing sessions and adequate rest are more appropriate than prolonged soaking.
The Pride of One of Japan’s Three Famous Hot Springs
Kusatsu Onsen is traditionally counted among Japan’s Three Famous Hot Springs, together with Arima Onsen and Gero Onsen.
The town has long been associated with hot spring bathing and toji culture. An old saying claims that Kusatsu’s waters can cure almost every ailment except “lovesickness,” reflecting the extraordinary reputation the springs acquired over the centuries.
An Extraordinary Natural Supply of Hot Spring Water
Kusatsu is also famous for its enormous natural hot spring discharge, traditionally estimated at more than 30,000 liters per minute.
This abundant supply has supported Kusatsu’s long-standing bathing culture and allows large quantities of fresh hot spring water to flow continuously through the town.
The Distinctive Acidity of Kusatsu
The strongly acidic character of Kusatsu’s springs is one of their defining features. With a pH of around 2, the water has a distinctly different sensation from many ordinary hot springs.
Combined with the abundant water supply and centuries-old bathing traditions, this powerful natural environment has helped shape Kusatsu into one of Japan’s best-known hot spring destinations.
Experience the Authentic Bathing Culture of Kusatsu
Shirahata-no-yu offers more than a simple place to take a bath. Its location beside the Yubatake, historic legends, distinctive Shirahata Source, and connection with Kusatsu’s communal bathhouse culture make it a memorable place to experience the character of the town.
For visitors from overseas, following local bathing etiquette and taking the time to understand the role of communal baths in everyday life can make the experience especially rewarding.
When exploring Kusatsu Onsen, step away from the main sightseeing route for a moment and experience Shirahata-no-yu as part of the town’s living hot spring culture.