Right Onsen › Gunma › Shibukawa
Akagi Natural Onsen Hanayu Utopia
3.7★ · 74 Google ratings · Shibukawa, Gunma · 赤城天然温泉 花湯ユートピア赤城
✓ Bedrock bath✓ Natural hot-spring water✓ Free-flowing source water✓ Outdoor bath✓ Rest area✓ Restaurant
Before you go
Can you bathe here?
Tattoos
Not allowedstated on the facility's website · read 2026-09
Hours
10:00–23:00from the facility listing
Price
¥700Standard bath admission is ¥600 on weekdays / ¥700 on weekends; a rock-bath (ganbanyoku) package with more amenities costs ¥1,200-1,400.stated by 2 visitors · Dec 2025 – Jul 2026
the facility's website lists ¥600 · source, read 2026-09
the facility's website lists ¥600 · source, read 2026-09
Watch out
Restaurant
A restaurant/food hall exists, but reviewers repeatedly report unreliable hours, a limited menu, and running out of food.
stated by 6 visitors · Oct 2025 – Jun 2026The bath
What you’ll find
A modern hotel-and-spa complex (Hanayu resort group, sister facility to Sky Terme) with sauna, cold bath, kakenagashi-advertised simple spring, and a paid rock-bath/temperature-therapy course, but with recurring complaints about restaurant reliability and one report of a loose, mildly dangerous rock seam in the bathing area.
Outdoor bath
✓ YesAn outdoor bath is confirmed.stated by 3 visitors · Jan 2026 – Aug 2026
Sauna
✓ YesA sauna is present, described by several reviewers as small.stated by 5 visitors · Oct 2025 – Jul 2026
Cold bath
✓ YesA cold plunge bath is present, measured at about 20°C by one reviewer.stated by 2 visitors · Oct 2025 – May 2026
View
GardenA public park sits directly in front of the facility, visible from inside.stated by 2 visitors · Jan 2026 – May 2026
Rest area
✓ YesA rest area exists, though the outdoor cool-down seating is described as cramped.stated by 2 visitors · Oct 2025 – Dec 2025
Restaurant
✓ YesA restaurant/food hall exists, but reviewers repeatedly report unreliable hours, a limited menu, and running out of food.stated by 6 visitors · Oct 2025 – Jun 2026
Lodging
✓ YesAn attached hotel is confirmed.stated by 3 visitors · Jan 2026 – Jun 2026
The water
Spring type
Simple, low-tonicity springDescribed as a simple, low-mineral-tonicity spring.stated by 1 visitor · Jan 2026
Source temperature
42°COne reviewer measured the source tap at 42°C.stated by 1 visitor · Jan 2026
Practical
What to bring
Hair dryer
✓ YesHair dryers are provided, though described as weak.stated by 2 visitors · Jan 2026 – May 2026
Guide
What visitors add
The water
One reviewer identifies the water as a simple, hypotonic spring (tanjunsen/teichosen), clear, 42C at the spout, leaving skin smooth; 4 other distinct reviewers echo good water quality or a smooth/refreshed after-feel (one describing it as squeaky rather than slippery).
stated by 5 visitors · Oct 2025 – May 2026Outdoor bath & sauna
The sauna is notably small: 4 distinct reviewers describe it as tiny (capacity estimates of about 5 people, '3 on the upper and 5 on the lower tier', and '6-7 people would be cramped'); one measured about 100C inside with a roughly 20C, 3-person cold bath. A cold-water bath is confirmed by 2 reviewers.
stated by 5 visitors · Oct 2025 – Jul 2026Day-use visits
One reviewer reports closing time is 23:00, with elevators and lights shut off exactly at closing; another reports the restaurant's lunch last order is 14:00. One reviewer notes crowding increases after about 14:00-15:00 when hotel guests arrive, recommending morning visits for quiet.
stated by 3 visitors · Oct 2025 – May 2026Towels, soap & lockers
Bring your own amenities: two distinct reviewers report there are no skincare/cleansing amenities in the powder room (one lists only dryers and cotton swabs as provided), and both note the dryers/one notes weak dryer airflow; a third reviewer adds there is no free drinking water despite the admission price.
stated by 3 visitors · Oct 2025 – May 2026Staffing
Entry is via a self-service ticket kiosk (one reviewer), but the facility is staffed: another reviewer describes staff seeing guests out at closing, and a third complains about slow restaurant service.
stated by 3 visitors · Oct 2025 – Nov 2025Bathing arrangement
The paid stone-sauna (ganbanyoku) area has two rooms: one women-only and one mixed. Three distinct reviewers reference the women-only room; one says its heat setting drives everyone into the mixed room causing queues, while another praises the women-only floor as hot enough to sweat quickly.
stated by 3 visitors · Jan 2026 – May 2026Timing
When to go
Quietest Thursday around 10:00; busiest Saturday around 16:00. Measured by Google over past visits, not a forecast.
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Quiet Busy
| Day | Hours |
|---|---|
| Monday | 10:00–23:00 |
| Tuesday | 10:00–23:00 |
| Wednesday | 10:00–23:00 |
| Thursday | 10:00–23:00 |
| Friday | 10:00–23:00 |
| Saturday | 10:00–23:00 |
| Sunday | 10:00–23:00 |
Practical
Plan your visit
📍 850-3 Akagimachi Miyada, Shibukawa, Gunma 379-1121
🚃 Shikishima station, 0.6 km
📞 +81279-56-4126
📋 Show at the counter: 赤城天然温泉 花湯ユートピア赤城
Nearby
Other baths close by
Yoshioka · 3.7★
Shibukawa · 3.9★
Maebashi · 3.7★
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