Right Onsen › Gunma › Katashina
Hataya Onsen Sasa-no-Yu Day-use Onsen
4.3★ · 49 Google ratings · Katashina, Gunma · 幡谷温泉ささの湯（日帰り温泉）
✓ Day visitors✓ Outdoor bath✓ Kakenagashi
Before you go
Can you bathe here?
Day visitors
Limited hoursConfirmed by recent visitor reports
Hours
15:00–20:00From the facility's listing
Tattoos
? Call aheadNo policy stated in the 50 recent reviews we read
Price
¥750 adultReported by two visitors
How we know this
- Day visitors: Day-use hours are restricted and seasonal: weekday off-season entry only from 15:00, versus around 11:00 on weekends/in-season. · 4 visitors, Apr 2026 – Jul 2026
- Price: Adult day-use admission is 750 yen. · 2 visitors, Apr 2026 – Aug 2026
The bath
What you’ll find
A beloved lukewarm 100% natural kakenagashi hot spring inn near Oze, prized by hikers and skiers for its unheated, unrecirculated, chlorine-free alkaline water in one indoor and one outdoor tub.
Bath setup
Indoor baths
1.0Reported by one visitor
Outdoor bath
✓ YesConfirmed by recent visitor reports
Sauna
✕ NoReported by one visitor
Cold bath
✕ NoReported by one visitor
Spring water
Spring type
alkaline simple springConfirmed by recent visitor reports
Source temperature
42°CReported by one visitor
Bath temperature
39°CReported by two visitors
Free-flowing (kakenagashi)
✓ FullFresh spring water flows continuously through the bath
Heated
✕ NoConfirmed by recent visitor reports
Water added
✕ NoReported by two visitors
How we know this
- Indoor baths: There is exactly one indoor bath tub. · 1 visitor, Apr 2026
- Outdoor bath: There is one outdoor bath alongside the indoor bath, consistently praised for its setting. · 6 visitors, Feb 2026 – Aug 2026
- Sauna: There is no sauna on site. · 1 visitor, Apr 2026
- Cold bath: There is no cold plunge bath. · 1 visitor, Apr 2026
- Spring type: It is an alkaline simple hot spring, known as a smooth 'beauty skin' bath. · 3 visitors, Apr 2026 – Aug 2026
- Source temperature: The natural spring source runs about 42C. · 1 visitor, Aug 2026
- Bath temperature: The indoor bath runs about 39-40C, with the outdoor bath noticeably cooler (around 36C), especially in winter. · 2 visitors, Mar 2026 – Apr 2026
- Free-flowing (kakenagashi): The spring is repeatedly certified/described as 100% kakenagashi with no heating, added water, or recirculation. · 5 visitors, Feb 2026 – Aug 2026
- Heated: The water is unheated, which is why it runs noticeably lukewarm. · 3 visitors, Mar 2026 – Aug 2026
- Water added: No water is added to dilute the spring. · 2 visitors, Mar 2026 – May 2026
Practical
What you need
Soap & shampoo
✓ ProvidedConfirmed by recent visitor reports
Lockers
✓ Coin returnedValuables lockers require a 100-yen coin, and there are only a limited number, so busy times can be an issue.Reported by two visitors
Parking
✓ Free on siteFrom the facility's listing
Facilities
Restaurant
✓ YesA restaurant/dining service exists but only operates on weekends.Reported by two visitors
Lodging
✓ YesReported by two visitors
How we know this
- Soap & shampoo: Shampoo, conditioner, and body soap are provided; most reviewers like the chemical-free products, though one found the quality low and hair left feeling stiff. · 3 visitors, Mar 2026 – Aug 2026
- Lockers: Valuables lockers require a 100-yen coin, and there are only a limited number, so busy times can be an issue. · 2 visitors, Mar 2026 – Aug 2026
- Restaurant: A restaurant/dining service exists but only operates on weekends. · 2 visitors, May 2026 – Aug 2026
- Lodging: This is also a ryokan with guest rooms, not just a day-bath facility. · 2 visitors, Apr 2026 – Mar 2026
Timing
When to go
Weekly hours
| Day | Hours |
|---|---|
| Monday | 15:00–20:00 |
| Tuesday | 15:00–20:00 |
| Wednesday | 15:00–20:00 |
| Thursday | 15:00–20:00 |
| Friday | 15:00–20:00 |
| Saturday | 11:00–20:00 |
| Sunday | 07:00–20:00 |
Getting there
How to get there
Nearest station
Numata19.0 km in a straight line; bus or taxi from the station
Address
535 Hataya, Katashina, Tone District, Gunma 378-0407From the facility's listing
Show a driver
幡谷温泉ささの湯（日帰り温泉）The name in Japanese, for a taxi or at the counter
Phone
+81278-58-3630Japanese-speaking. For tattoos or private baths a call is the only sure answer
Website
www.sasanoyu.netOfficial, in Japanese
The map loads only when you ask for it and connects your browser to Google.
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What matters
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Questions
Common questions
Can I visit Hataya Onsen Sasa-no-Yu Day-use Onsen without staying overnight?
Day-use hours are restricted and seasonal: weekday off-season entry only from 15:00, versus around 11:00 on weekends/in-season.
How much does Hataya Onsen Sasa-no-Yu Day-use Onsen cost?
Adult day-use admission is 750 yen.
Is the water free-flowing spring water?
The spring is repeatedly certified/described as 100% kakenagashi with no heating, added water, or recirculation.
