HappuOnsen

Natural hot spring embraced by Karuizawa's great outdoors

Nagano Karuizawa Town

A day-use hot spring facility where you can enjoy Happu Onsen, a rare natural hot spring in the Karuizawa area. The bicarbonate spring, regarded as one of the three 'beautifying' spring types, is gentle on the body and is said to be effective for cuts and improving skin. Surrounded by warm dappled sunlight and star-filled skies, you can fully enjoy the sauna, cold plunge bath, open-air baths, and more.

Hot Spring & Bath Information

Happu Onsen

TypeNatural Hot Spring

A natural bicarbonate spring, regarded as one of the three 'beautifying' spring types. A gentle hot spring said to be effective for cuts and for improving skin.

Sauna

Sauna

90°C

Sauna TypeDry Sauna

Capacity5people

Men'sWomen's

A sauna provided in both the men's and women's bathing areas.

Cold Bath

Cold plunge bath

18°C

Capacity3people

Men'sWomen's

A cold plunge bath to cool down after warming up in the sauna.

Business Hours

Monday
10:00〜22:00
Tuesday
10:00〜22:00
Wednesday
10:00〜22:00
Thursday
10:00〜22:00
Friday
10:00〜22:00
Saturday
10:00〜22:00
Sunday
10:00〜22:00
Holiday
10:00〜22:00

Closed Days: None

Address

389-0113 Nagano Prefecture, Kitasaku District, Karuizawa Town Hotsuji 864-4, inside Le Grand Karuizawa Hotel & Resort, Japan

Onsen & Spa Facilities (Super Sento, Sauna, Spa)

Gender Access

Gender Separated

Tattoo Policy
Unknown (Please Check)
Premium Magazine

Japan's Must-Visit Finest Onsen & Sauna Facilities

Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.

Learn more