Asama Onsen, Matsumoto, Nagano Prefecture
Senki-no-Yu
The best fit for an early, low-cost soak in a traditional local bathhouse. For a sauna, lounge or later visit, Hot Plaza Asama is the more practical option.
Check before bathing
- Opening hours
- 06:30–20:00; irregular closing days. Check whether it is open on the day of your visit.
Spring & water temperature
- Spring-source temperature
- Not published for Senki-no-Yu. The district-level 49.7°C figure for Asama Onsen is not substituted for this bath.
- Bathing temperature
- Not published.
- Spring source
- The Asama Onsen spring system; the current 2026 facility page does not safely identify the individual well used by Senki-no-Yu.
- Spring classification
- Not published for this individual bath. Asama Onsen is classified at the district level as an alkaline simple hot spring; that district-level classification is not substituted for a facility-specific analysis.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- The current official visitor page does not fully publish water addition, heating, circulation, disinfection or source-flow conditions. These details remain unconfirmed.
Bathing indications
Asama Onsen has general bathing indications at the district level, but the current individual facility page does not provide enough technical detail to make a facility-specific treatment claim.
Adult admission is ¥400. The facility has irregular closing days. Its current official page does not provide a complete amenities or tattoo-policy list; bring a towel and basic toiletries, and confirm that it is open 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.
