Hoshino Onsen Tombo no Yu

Hoshino Onsen Tombo no Yu is a day-use hot spring facility located in Karuizawa Town, Kitasaku District, Nagano Prefecture. Opened in 1915, this renowned hot spring, beloved by many cultural figures such as Hakushu Kitahara and Akiko Yosano, can be enjoyed with its free-flowing source water. The simple hot spring, which gushes out at 400 liters per minute, is known as 'Bijin no Yu' (Beautiful Skin Water) for its gentle, skin-softening properties. Experience a refreshing totonou with the auto löyly sauna and the approximately 13°C cold plunge bath using spring water from the Wild Bird Forest. Relax your body and mind while enjoying the seasonal scenery from the indoor and open-air baths. At the adjacent cafe, Hungry Spot, you can enjoy craft beer and soft serve ice cream after bathing, spending a luxurious moment woven by the nature and history of Karuizawa.

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Nagano Prefecture, Kitasaku District, Karuizawa Town, Nagakura 2148
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Facility Name
Hoshino Onsen Tombo no Yu
Facility Type
Onsen & Spa・Hotel & Ryokan
Address
Nagano Prefecture, Kitasaku District, Karuizawa Town, Nagakura 2148
Website
https://www.hoshino-area.jp/tombo-no-yu/
Closed Days
None
Business Hours
Friday 10:00〜22:00
Monday 10:00〜22:00
Sunday 10:00〜22:00
Holiday 10:00〜22:00
Tuesday 10:00〜22:00
Saturday 10:00〜22:00
Thursday 10:00〜22:00
Wednesday 10:00〜22:00
Tattoo Policy
🚫 No Tattoos

♨️Hot Spring Information

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Hoshino Onsen
Natural Hot Spring
Flow-through
Hoshino Onsen has a history of over 100 years since its opening in 1915. It boasts an abundant outflow of 400 liters per minute, with all baths supplied by free-flowing source water. The weak alkaline simple hot spring gently envelops the skin, reputed as 'Bijin no Yu' (Beautiful Skin Water). The texture of the water is soft, leaving the skin smooth after bathing. It has high heat retention, warming you from the core and making it difficult to catch a chill. The indoor bath is deep enough for a relaxing soak up to the shoulders, and the open-air bath allows you to enjoy the renowned hot spring while viewing the seasonal scenery. It is expected to be effective for chronic lower back pain, sensitivity to cold, and recovery from fatigue. Drinking the spring water is also possible.

Sauna & Cold Bath Information

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Sauna
Male
85°C
A dry sauna at approximately 80-90°C. The auto löyly every 20 minutes circulates heat and steam to promote sweating. You can enjoy the seasonal scenery from the window in a calm space with jazz background music. Surrounded by the nature of Karuizawa, you can thoroughly warm your body. The interior, made with cypress and natural stone, is comfortable, allowing you to simultaneously enjoy the relaxation effects of sight, sound, and heat.
Sauna Type
Dry Sauna
Stove Type
Convection Stove (Sauna Stone)
Capacity
10people
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Cold Bath
Male
13°C
A cold plunge bath using natural spring water from the Wild Bird Forest. With a stable coldness of about 13°C throughout the year, it quickly cools down the body heated in the sauna. The water quality is characterized by its softness and refreshing feel, unique to spring water. As it is free-flowing, fresh water is always being supplied, offering a sense of gentleness within the coldness. Experience a refreshing sharpness while feeling the blessings of Karuizawa's nature throughout your body.
Water Quality
Groundwater
✓ Flow-through