Yudanaka Onsen, in front of Yudanaka Station, Yamanouchi, Nagano Prefecture
Kaede-no-Yu, Yudanaka Station-Front Onsen
The most straightforward option for a single soak by Yudanaka Station, with full washing facilities and a place to rest. For a tour of local communal baths, use the 2026 outdoor-bath pass instead.
Check before bathing
- Opening hours
- 10:00–21:00; last admission 20:30. Normally closed on the first Tuesday of each month; if that day is a public holiday, it closes the following day.
- Access
- Directly in front of Yudanaka Station.
Spring & water temperature
- Spring-source temperature
- About 91.7°C in existing Ministry of Land, Infrastructure, Transport and Tourism information; this is not a 2026 re-sampling.
- Bathing temperature
- About 42–43°C in existing ministry information; the actual temperature may be adjusted on the day.
- Spring source
- Yudanaka Onsen; the current main page does not name the individual spring used by Kaede-no-Yu.
- Spring classification
- Sodium chloride-sulfate hot-spring system. Yamanouchi Town confirms natural source-flowing water; existing national transport ministry information lists sodium, chloride and sulfate components.
- pH
- Not published.
- Flow rate
- About 100 L/min in existing ministry information; this is a facility-guide figure, not a 2026 re-sampling.
- Water handling
- Yamanouchi Town identifies natural source-flowing water and indoor and outdoor baths. Existing national government information says high-temperature source water is adjusted to bathing temperature. The 2026 main page does not publish the amount of added water or pool-by-pool circulation and disinfection details, so none are inferred.
Bathing indications
Existing official information lists general bathing indications including neuralgia, cuts and sensitivity to cold. This is not a treatment guarantee.
Adult admission is ¥500 and elementary-school children ¥300. From 2026, Yudanaka residents receive free admission on their birthday with identification. There is also a free footbath by the station. The listed source temperature and flow are from existing government information, not a new 2026 analysis.
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.
