Hirayu Onsen, Okuhida Onsen-go, Gifu
Hirayu-no-Mori
A well-rounded first stop in Okuhida, especially if you need proper washing facilities after a hike or are travelling without a car. The operator confirms source-flowing water, cooling with valley water and no heating, recirculation or chlorine-based disinfection. A scheduled maintenance closure was announced for September 9, 2026; check the latest calendar before going.
Check before bathing
- Opening hours
- Day use 10:00–21:00; last reception 20:30. Adult admission ¥700 and child admission ¥500. The operator announced a maintenance closure for September 9, 2026; that dated closure has passed, but check for any newer notice.
Spring & water temperature
- Spring-source temperature
- 67.7°C for the two-source system, according to the operator; this is not the temperature of each bath.
- Bathing temperature
- No fixed figure is published. The operator says outdoor pools have different temperatures and are adjusted with valley water.
- Spring source
- Two springs: Hirayunomori-no-Yu and Suiseki-no-Yu.
- Spring classification
- Calcium-sodium-magnesium bicarbonate and chloride spring.
- pH
- 6.7.
- Flow rate
- About 600 L/min combined across the two springs.
- Water handling
- The operator says the two springs together yield about 600 L/min and are used as source-flowing water. Valley water is added to cool the hot source; the operator says there is no heating, recirculation or chlorine-based disinfection.
- Analysis date
- 2026
The maintenance closure announced for September 9, 2026 is date-specific; check for any more recent closure notice.
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.
