In the Hakkoda mountains, bathing since 1684 and Japan's first National Recuperation Onsen. A vast all-cypress mixed bath hall (about 260 m²) fed by four sources. Women-only hour 8–9 am daily; bathing garments sold on site.
Twenty minutes by train from Aomori, a panoramic bath on the 5th floor of the roadside station at Asamushi Onsen on Mutsu Bay. Big windows frame Yunoshima island and the bay — sunset is the prime slot. Salt- and sulfate-rich water keeps you warm afterwards. Just ¥360, open 7:00–21:00 every day. The ground-floor market sells Aomori souvenirs. Two minutes' walk from Asamushi-Onsen Station.
A lone inn in a primeval beech forest on the southern flank of Mt. Hakkoda. Spring water wells up directly through the gaps in the hiba-cypress boards on the tub floor — 'free-welling', so you bathe in water that has never touched air, a rarity even in Japan. The all-hiba 'Kyuan-no-yu' bathhouse from 1918 is magnificent. Day use 10:00–15:00, ¥1,000; may close early when busy. Combine with the hour-long trail around Tsuta-numa pond, famous for autumn colour. Closed in winter.
The highlight of any Gonō Line journey: a lone inn famous nationwide for its 'seaside open-air bath' set right at the water's edge of the Sea of Japan. Iron-rich chloride water, rust-red and cloudy, seems to merge with sea and sky. Day use is ¥600 — the seaside bath 8:00–16:00 (last entry 15:30), the main-building indoor 'Kogane-no-yu' 8:00–20:00. The mixed outdoor bath allows bathing wear (rental fee); a women-only outdoor bath sits alongside. Sunset soaks are for overnight guests only, so stay if you want one of Japan's 100 best sunsets from the tub.
The communal bath at the heart of Nuruyu Onsen in Kuroishi, Aomori, a spa with more than 400 years of history. It is ringed by 'kyakusha' — simple self-catering cure lodgings with no baths of their own, whose guests all walk over here — a form of spa life now rare even in Tōhoku. The bathroom is as roomy as a sentō, with 100% source water (sodium chloride-sulphate) cooled by a special method without dilution and split into hot and lukewarm tubs. Adults pay ¥350; open long hours from 05:00 to 22:00 (last entry 21:30), daily (occasional closures in April and November). No soap provided. Kokeshi-doll workshops and the Tsugaru Kokeshi Museum are nearby. About 25 minutes by bus from Kuroishi Station.
A lone hidden spring at the end of a forest road in the hills of Ikarigaseki, Hirakawa, near the Aomori–Akita border. Famed nationwide for its gushing flow — said to be 500 litres a minute — the overflow from the tub streams across the entire washing floor like a river, and the place once topped a fan vote for the best free-flowing bath in Japan. The sodium-calcium-chloride-sulphate water is pale yellow-brown with an iron tang, and the local way to enjoy it is 'todo-ne': lying flat on the floor and letting the running water wash over you like a sea lion. After a long closure it reopened, renovated, in December 2025: day bathing adults ¥600, children ¥200, 09:00–20:30. Lodging is bed-and-breakfast or room only. Pick-ups from Ikarigaseki Station and Yunosawa can be arranged (contact in advance). Facilities are basic and days and hours can change, so check by phone or on the official social media. About 15 minutes by car from JR Ikarigaseki Station or Ikarigaseki IC; beware of deep snow in winter.
A town-run community centre at the gateway to Ōwani Onsen, a spa with 800 years of history south of Hirosaki. Just 2 minutes on foot from Ōwani-Onsen Station on the JR and Kōnan lines, its day bath Wani no Yu has an indoor pool, open-air bath, bubble bath and sauna. The clear sodium-calcium chloride and sulfate spring warms you to the core, and in winter the outdoor bath becomes a snow-viewing tub. Admission is a modest ¥550 for adults and ¥270 for children (town residents ¥400/¥200), and long hours of 9:00–22:00 are a strong point; two reservable family baths, Hagikatsura and Kawasemi, rent by the hour. Closed the third Thursday. Inside are a farm-produce corner, free rest areas with tables and tatami, and a lunch-only restaurant serving dishes and souvenirs made with the famous Ōwani onsen bean sprouts. Free parking for 80 cars. Open late enough to drop by after dinner in Hirosaki – a handy base for Hirosaki Castle or the Ōwani ski slopes.
A resort hotel standing at Jogakura Onsen, opened in 1965. It lies only two kilometres from Sukayu Onsen, known for its acidic sulphur spring, yet here a clear and mild water rises, said to be easy on the body and suitable even for sensitive skin. Day bathing is received from 11:30 to 15:00, last entry 14:30, at 1,000 yen for adults, 500 yen for elementary pupils and 300 yen for infants. The open-air bath runs straight from the source and, unusually for Hakkoda, can be used all year. The main bath has a cold bath, a mist sauna and a whirlpool, while the indoor bath is adjusted with added water, heating and circulation. Hand towels are sold for 200 yen and bath towels are not lent out.
An inn of more than a hundred years at Asamushi Onsen, where you bathe looking at a garden with a falling stream. Day bathing is from noon to 4:00, reception until 3:00, at 500 yen for adults and 300 yen for children. The water is a sodium-calcium sulphate-chloride spring running straight from the source. It is easy to reach, about 20 minutes from Aomori Station by the Aoimori Railway.
A healing-spring inn some 400 years old, set deep in the Hakkoda mountains and counted among Japan's three great hidden onsen. It has two baths fed by springs that well up from the bath floor: a clear 38°C 'lower bath' and a milky, sulphur-clouded 42°C 'upper bath'. Alternating between them suits both cool-soak and hot-soak bathers. Day use is 800 yen for adults.
A long-established onsen hotel founded in 1925 in Owani Onsen, Owani-machi, Aomori. Its calcium-sodium chloride-sulfate spring fills a grand open-air bath with massive rocks and an open large bath, all free-flowing, and day bathing is accepted.
A nine-room family-run inn in Nuruyu Onsen, Kuroishi, Aomori, opened in the Meiji era. Its signature is a spout shaped like a bandit's face, and the free-flowing natural-spring indoor bath overlooks the Asaseishi River. The communal bath Tsuru no Meiyu is right across the way, and day bathing is a bargain at 250 yen.
A hotel on a hill in the Fukaura Station area, where the World Heritage Shirakami Mountains meet the Japan Sea coast. It draws Nabeishi Onsen from the town - an iron-bearing sodium-chloride strong brine whose salty taste warms the body. The baths sit in a separate building called Benten-no-Yu at the end of a long corridor, a Benten statue watches over the bath from its center, and the panoramic open-air baths for men and women look out over sunsets on the Japan Sea.
A day-trip onsen attached to Michi-no-Eki Ikarigaseki Tsugaru Sekinosho, a 3-minute walk from JR Ikarigaseki Station. The simple spring flows straight from the source (kake-nagashi) into a large bath lined generously with fragrant Aomori hiba cypress - a calm, wood-wrapped space. Alongside the gender-separated indoor baths, a private bath (1,500 yen per hour, reservation required) is popular, and at 400 yen for adults it has long been a local favourite. There is no open-air bath, but bathing in the scent of hiba quietly melts away travel fatigue. Afterwards you can browse local food and produce at the road station, and the Ikarigaseki IC is close by - a convenient stop on any trip.