Adatarayama Okudake no Yu Onsen
あだたら山 奥岳の湯あだたらやま おくだけのゆ
Open-air mountain bath at the base of Mt. Adatara
Day Use
YesAdults (middle school+) ¥800, Children (4yrs–elementary) ¥500. ¥100 off with ropeway round-trip ticket, ¥50 off with one-way. JAF card ¥50 off.
Bathing & Water
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Sauna room of any kind
Bathing Arrangements
A private bath you can reserve for yourself or your group
Shared bathing area for all genders
Policies & Services
Allows entry with visible tattoos
Entry permitted if tattoos can be completely covered with up to 2 facility-designated cover seals (85mm×105mm, sold on-site).
Shower, wash stations, soap and shampoo provided
Relaxation space for after bathing
On-site or nearby parking available
Views
MountainsAbout
A no-frills day-use bath at the foot of Mt. Adatara, popular with hikers finishing the trail and skiers coming off the slopes. The outdoor bath (rotenburo, 露天風呂) looks out over the mountains with nothing blocking the view. The water is lightly acidic and runs slightly milky with a faint sulfur note. There's also a small indoor bath. The building is simple, just the baths and changing rooms, so don't expect a lounge.
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Last updated September 19, 2026