Kuroyu Onsen is a traditional ryokan within the Nyuto Onsen cluster in the mountains above Lake Tazawa, Senboku City, and one of eight distinct hot spring properties that together form this celebrated mountain spa hamlet. The property sits approximately 30 kilometres from JR Tazawako Station, reachable by the Nyuto Onsen bus service during spring through autumn and by private transport in winter when the mountain roads are snow-covered. The surrounding landscape of old-growth cedar and beech forest — particularly vivid during October's autumn foliage season — defines the experience as much as the thermal waters themselves.
The ryokan has the character of a mountain refuge: timber-framed buildings with shingled roofs, low-ceilinged corridors, and tatami rooms simply furnished with laid-out futon beds and a low central table. Standard and deluxe tatami rooms differ primarily in size and position. Neither room category includes television or internet access, consistent with the Nyuto Onsen district's overall philosophy of retreat from digital habits. Seasonal kaiseki meals included in the per-person rate are built around local mountain vegetables, river fish from nearby streams, and wild game dishes in autumn, served communally in the dining room.
The hot spring water at Kuroyu is distinguished by its milky-white opacity, caused by dissolved sulfur compounds, and a characteristic sulphurous scent typical of Nyuto Onsen waters. The property's signature outdoor mixed bath (konyoku) is among the best-known features of the district. Indoor baths separated by gender are available as an alternative. A hiking trail connecting Kuroyu to the neighbouring Tsuru-no-yu and other Nyuto Onsen properties allows guests to experience multiple mineral springs on the same visit, facilitated by the shared Nyuto Onsen Yumegunri passport.
| Price | ¥18,000–28,000 (~$118–184 USD) per person with 2 meals |
|---|---|
| Address | Tazawako Kuroyu, Senboku, Akita 014-1204 |
Room types
- Standard tatami
- Deluxe tatami
Amenities
- Outdoor mixed onsen (milky white water)
- Indoor baths
- Seasonal kaiseki meals
- Tatami rooms
- Hiking trail access
Weather through the year in Japan
Best time Shoulder Worth avoiding
Average daytime temperature in °C. Figures are for Japan.
Location
Tazawako Kuroyu, Senboku, Akita 014-1204
39.7748, 140.6205 View on map
Highlights
- Milky-white sulfur spring water unique to the Nyuto Onsen cluster — one of Japan's most distinctive mineral onsen
- Outdoor mixed-gender bath (konyoku) in a forest mountain setting
- Hiking trail linking Kuroyu to neighbouring Tsuru-no-yu and other Nyuto Onsen properties
- Kaiseki meals featuring mountain vegetables, river fish, and seasonal wild game included in the rate
Tips for visiting
- The Nyuto Onsen Yumegunri passport allows access to all eight cluster baths on a single ticket — buy one at the ryokan or the bus terminal
- Autumn foliage at Nyuto Onsen peaks in mid-to-late October; book well in advance for this period
- The bus schedule to Nyuto Onsen is limited to daytime hours — confirm the last departure time before planning your arrival
- Bring cash for the stay; card payment facilities may be limited at traditional mountain ryokan properties
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Frequently asked questions
What makes Kuroyu's spring water different from other onsen?
Kuroyu's water is milky-white due to dissolved sulfur compounds, giving it a distinctive appearance and a mild sulphurous scent characteristic of the Nyuto Onsen cluster.
Are meals included?
Yes, the per-person room rate includes a kaiseki dinner and Japanese breakfast featuring local mountain produce and seasonal ingredients.
Can guests visit other Nyuto Onsen baths from Kuroyu?
Yes — a hiking trail connects Kuroyu to neighbouring properties, and the Nyuto Onsen Yumegunri passport allows multi-bath access across all eight cluster ryokan.