7 Best Karuizawa Hotels with Onsen

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Decide first whether you want the hot spring bath in your room or down the corridor, because Karuizawa hotels split cleanly on that. Two inns fill a private bath in every room with natural spring water. The big resorts send you to shared onsens on their grounds instead. Some resort guests cannot enter every bathhouse. Here’s where I’d book, depending on how private you want your soak.

Karuizawa Hotels with Onsen

Private Bath or Shared Onsen

The baths come in two kinds: in your room or in a separate bathhouse. Karuizawa sits on the Asama Plateau at an altitude of 1,000 meters, so the air around an outdoor bath is cool.

• Private Baths Fill from the Spring: Baths at Fufu Kyu-Karuizawa Seiyou No Mori and Fufu Karuizawa Yokou No Kaze are in the room, so there is no bathhouse timetable to work around. The water at Fufu Karuizawa Yokou No Kaze comes from Tateshina.
• Shared Onsens Sit in Their Own Buildings: At the Prince resorts the onsen is a separate bathhouse with indoor and open-air baths. The Forest Hot-Spring adds a steam sauna. Each bathhouse is open to guests of set buildings only.
• The Altitude Sets the Season: Air at 1,000 meters stays far cooler than in Tokyo, even in August. An open-air bath in summer feels cool on the shoulders, and one in January calls for a quick dash from the changing room.

Getting to the Hotels from Karuizawa Station

Karuizawa Station, on the Hokuriku Shinkansen line, is the starting point for every hotel.

• Train from Tokyo: Hokuriku Shinkansen trains take 64 to 80 minutes from Tokyo Station. Ueno Station is a stop on the same line. Airport trains connect with the shinkansen at those two stations.
• Shuttle Buses for the Resort Hotels: The Prince hotels run a hotel shuttle bus from the South Exit of the station. Le Grand Karuizawa Hotel & Resort lists its own shuttle service too.
• Taxis for the Quiet Inns: Two Fufu inns and Kose Onsen Hotel sit in the woods away from the main shopping area. A taxi from the station reaches each in under 20 minutes.

Soaking Without Staying Overnight

Day-use onsens take visitors who sleep elsewhere, so a hotel without a spring bath can still fit a soak into the day.

• Karuizawa Sengataki Onsen: Prince Hotels runs this onsen for day visitors, with a garden open-air bath and an open-air bath under a hanging roof. It also has a sauna and a cold-water bath. The water is a clear sodium bicarbonate and chloride spring.
• Hoshino Onsen Tombo no Yu: This is a well-known onsen in Karuizawa, filled from a natural spring that wells up from underground. It sits in the Hoshino area, reached by local bus or taxi from the station. The open-air and indoor baths look onto the trees.

When to Go for the Baths

Karuizawa’s busiest stretches are autumn and August, and the baths feel different in each season.

• October and Early November Are Busy: The autumn leaves around Kumoba Pond peak from late October into early November, and rates climb with the crowds. The Sports Day long weekend in October is a full one.
• Winter Is the Quiet Season: January to March draw the thinnest crowds of the year. The Prince ski slope runs on artificial snow. A soak after a day on the slope is the draw at the hotels beside it.
• August Is Cool but Full: Highs in early August stay in the 20s C, far cooler than the lowlands. Mountain Day and the Obon holiday in mid-August fill the hotels. Book early for those dates.

FAQs

1. Which Karuizawa hotels have a hot spring bath in the room?

Fufu Kyu-Karuizawa Seiyou No Mori and Fufu Karuizawa Yokou No Kaze put a natural hot spring bath in every room, so you soak at any hour without dressing for a bathhouse. The other hotels keep their spring water in shared bathhouses or private open-air baths instead. Each of the two inns has 24 rooms or fewer.

2. Can guests at Karuizawa Prince Hotel East use both Prince onsens?

No, only the Forest Hot-Spring is open to East guests. The Momiji Hot-Spring is for guests of the West main building, The Prince Karuizawa and the Prince villas. Guests of Karuizawa Prince Hotel East cannot enter it, and neither can guests of the East cottages. A room in the West main building gets you the Momiji bathhouse instead.

3. Can you visit a Karuizawa onsen without staying overnight?

Yes, Karuizawa Sengataki Onsen and Hoshino Onsen Tombo no Yu both take day visitors. Sengataki is run by Prince Hotels and has open-air baths and a sauna. Tombo no Yu sits in the Hoshino area and is filled from a natural spring. Either one fits a day trip from any hotel in town.

4. How long does it take to get from Tokyo to Karuizawa?

Hokuriku Shinkansen trains take 64 to 80 minutes from Tokyo Station to Karuizawa Station. Ueno Station is on the same line. Airport passengers connect to the shinkansen at Tokyo or Ueno. From the station, each hotel is a walk, a shuttle or a short taxi ride away. The same line continues on to Nagano and Kanazawa.

5. Is a car needed to stay in Karuizawa?

Not at the hotels near the station. The Prince hotels run shuttle buses from the station, so a car adds little. The two Fufu inns and Kose Onsen Hotel sit in the woods, where a taxi from the station reaches each in under 20 minutes. Bicycle rental shops stand around the station for the old town.

6. When is the best time for a hot spring stay in Karuizawa?

October and early November are among the busiest weeks because of the autumn leaves, so they are the best time for views and the worst for rates. January to March bring the quietest bathhouses and a ski slope beside the Prince hotels. August is far cooler than Tokyo and fills the hotels around Mountain Day and Obon.

7. Do the Karuizawa baths use natural hot spring water?

Each hotel listed gives guests a bath filled with natural hot spring water. The in-room baths at the two Fufu inns use it, and the Prince bathhouses name their springs on the hotels’ own pages. Hot spring water also fills the baths at Kose Onsen Hotel and Le Grand Karuizawa Hotel & Resort.