Shirahone Onsen, Matsumoto, Nagano Prefecture
Baikoan Day-Use Bath
A practical stop if you want to combine an open-air soak with a Shirahone-style lunch. It closes for winter, while the public open-air bath is the more direct option if price is the priority.
Check before bathing
- Opening hours
- Bathing 10:00–18:00; last admission 17:30. Closed Wednesdays. The restaurant is open 11:00–14:30, with last orders at 14:00. Usually operates from mid-April to the end of November, then closes for winter; other closure days may apply.
- Tattoo policy
- The current first-party information does not confirm a tattoo policy. Check with the facility before visiting.
Spring & water temperature
- Spring-source temperature
- Not published.
- Bathing temperature
- Not published.
- Spring source
- Baikoan's own spring; the current main official page does not name it.
- Spring classification
- Natural hot spring; a specific chemical classification for Baikoan is not published on the current main page.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- Shirahone Onsen's official information describes Baikoan's open-air bath as source-flowing. The restaurant also uses its own spring water to cook hot-spring porridge. Water addition, heating, circulation and disinfection conditions are not published for each bath.
Bathing indications
The official description focuses on the source-flowing bath and food made with spring water. Neither is presented as medical treatment.
The open-air bath is described as source-flowing; other pool-by-pool treatment details are not published.
Admission is ¥800 for adults and ¥400 for children. The current main official page does not list a complete towel and amenity price list.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
