Hirugami Onsen, Achi, Nagano Prefecture
Hirugami-no-Mori Hotel Day-Use Bath
Best for an afternoon arrival when an elevated open-air bath and seasonal views matter most. It is not the best fit for an early soak, a low budget, guests with tattoos or anyone relying on a fixed weekly closing day.
Check before bathing
- Opening hours
- Usually 15:00–20:00, with guests leaving by 21:00. The facility may close on irregular days or for private bookings and maintenance. It opened from 10:30 only during the published summer period, 18 July–31 August 2026. September swimming-pool hours do not mean the baths open early.
- Tattoo policy
- Not permitted. The current official website says people with tattoos, including inked body art, may not enter.
Spring & water temperature
- Spring-source temperature
- Not published.
- Bathing temperature
- Not published.
- Spring source
- Hirugami Onsen; an individual spring-well name is not published.
- Spring classification
- Alkaline simple spring, according to the facility's current description.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The facility confirms Hirugami Onsen water in its large bath and open-air bath. Water addition, heating, circulation, disinfection and source-flow conditions are not published pool by pool.
Bathing indications
The facility lists general bathing information associated with the spring type. This is not a treatment, medical or beauty guarantee.
Water addition, heating, circulation, disinfection and source-flow conditions are not published for each pool.
Day-use admission in 2026 is ¥1,000 for adults and ¥700 for children. Irregular closures, private bookings and maintenance may affect access; confirm before travelling.
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.
