Sukayu Onsen
酸ヶ湯温泉40°39′ N 140°51′ ERyokan¥1,000, about CAD 9 or USD 6.30 (October 2026 rates)
Sukayu suits anyone who wants to bathe the way Japan's mountain spas have for 300 years, in one huge cypress hall; the main bath is mixed, so women who want privacy use the separate Tama-no-yu or the women-only hour.
Photo あおもりくま,(Aomorikuma) · Wikimedia Commons · CC BY-SA 4.0 and others, credited in the gallery
Know before you bathe
The Sennin-buro is a mixed bath, and people come here to soak quietly. You may wear a yuami-gi bathing wrap if you like, but only the ones Sukayu rents for ¥500 or sells for ¥1,300; wraps brought from home aren't allowed. Keep your eyes to yourself, keep cameras out of the bathhouse and leave the women-only hour to women.
Getting there
Sukayu stands at about 900 metres on the western foot of Mt. Odake in the Hakkoda range. Since 27 November 2025 the ryokan's free shuttle bus for guests runs from Shin-Aomori Station.
Sukayu has taken bathers since 1684, and in 1954 it became the first spa the government named a national health resort. Its centrepiece is the Hiba Sennin-buro, whose name means thousand-person bath. The 160-mat hall is built entirely of Aomori cypress and has no pillars in the bathing space. Four sources feed it. You move from the hot pool to the cooler one and stand under the hot-water fall at the end.
The Sennin-buro is mixed, and men and women share the water. Sukayu rents yuami-gi bathing wraps to men and women for ¥500 and sells a women's wrap for ¥1,300, and wearing one is your choice. Until 30 November 2026 the hall keeps 8:00 to 9:00 for women only. Tama-no-yu is a smaller pair of separate men's and women's baths with similar milky water, and the women's side has showers.
Day bathing changes on 1 December 2026. Hours shorten to 9:00–16:00 and the price goes to ¥1,500 with towels included, and day visitors can still use both baths and the rest lounge. Sukayu closes completely from 16 to 18 November 2026 for maintenance.
Sukayu sits inside the Towada-Hachimantai National Park on an active volcano that JMA keeps at alert level 1. JMA's alert-level leaflet names the hot-spring buildings on Hakkoda's west side, near the Jigokunuma crater, as a zone that may need early evacuation if the volcano stirs. Bears live on these slopes too. After a bear attacked a man at the end of June 2026, the prefecture's special bear warning kept the Hakkoda trails closed until 31 July. The ryokan lends bear spray to hikers.
Worth knowing
- Come before 15:30 if you're day bathing after 1 December 2026, because the last ticket sells at that time.
- Rent the yuami-gi at the shop counter if you want to try the mixed bath covered; home-made or store-bought wraps aren't allowed.
Quick answers about Sukayu Onsenよくある質問
Is Sukayu Onsen a mixed bath?
Yes. The Hiba Sennin-buro is mixed, and until 30 November 2026 it keeps 8:00–9:00 for women only. The separate Tama-no-yu baths split men and women.
Can I wear a towel or swimsuit in Sukayu's mixed bath?
You can wear a yuami-gi bathing wrap, but only one Sukayu rents for ¥500 or sells for ¥1,300. Wraps brought from home aren't allowed.
How much is day bathing at Sukayu Onsen?
¥1,000 for adults until 30 November 2026. From 1 December 2026 it costs ¥1,500 with towels included, from 9:00 to 16:00.
What are the opening hours of Sukayu Onsen?
Sukayu Onsen keeps these hours: Mon–Sun 07:00–18:00.
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