Nestled at the far end of a steaming volcanic Sainokawara Park, Sainokawara Rotenburo (西の河原露天風呂) stands as one of Japan’s most impressive outdoor bathing experiences. Known for its massive size and stunning forest views, this iconic Kusatsu Onsen destination offers travelers a unique way to soak in the region’s highly acidic, healing waters. Whether you are looking for a quiet soak under the stars or planning to visit during the popular Friday mixed-gender sessions, our guide covers the essential rules, fees, and tips to ensure your visit to Sainokawara is the highlight of your trip to Gunma.
All You Need to Know About Sainokawara Open-Air Bath
- What Makes Sainokawara Rotenburo Special?
- The Friday Mixed-Gender Bathing Experience at Sainokawara Open Air Bath
- Essential Tips for Your Visit to Sainokawara Onsen
- Sainokawara Outdoor Bath's Opening Hours and Admission Fee
- How to Get to Sainokawara Outdoor Bath from Yubatake
- FAQ About Sainokawara Outdoor Bath
- Does Sainokawara Outdoor Bath allow mixed-gender bathing?
- Is it required to wear a swimsuit during the mixed-gender sessions?
- Are there showers or changing facilities available on-site?
- Is the Sainokawara Outdoor Bath tattoo-friendly?
- How long does it take to walk to the bath from the Yubatake?
- Is the water at Sainokawara very hot?
- Discover Other Attractions in Kusatsu Onsen
What Makes Sainokawara Rotenburo Special?
Especially during the fall foliage season from late October to early November, Sainokawara Open-Air Bath is particularly popular amongst visitors. You can avoid the crowd by heading there in the early morning or at night.
- In the early morning, the public bath might be covered in steam when the temperature is low. So if you want to experience that, get there as early as possible before the mist disappears in the sun’s heat.
- The hot spring pools are illuminated at night, giving you a completely different bathing experience.
While you might be wondering why you even bother venturing out of your hotel to a park to bathe, the experience will be different.
Sainokawara Open-Air Bath is as spacious as 500 square meters. The onsen pools are so spacious that they could fit hundreds of people at one given time!
Walking on the promenade surrounded by nature, bathing there is almost no different from bathing in the wild nature!
One funny thing about Sainokawara Outdoor Bath is its spring source. Although Sainokawara Park has 1,400 litres of hot springs flowing out per minute, the bathhouse uses the Bandai spring source.
Tip: The water is hotter near the source (the back of the bath). If you are sensitive to heat, stay near the entrance.
The Friday Mixed-Gender Bathing Experience at Sainokawara Open Air Bath
Sainokawara Outdoor Bath’s Male Open-Air Bath becomes a mixed-gender bath on Friday night from 5:30 pm to 8 pm. Female guests can use the door in the partition in the bathing area to access the male open-air bath without going through the changing room.
You can put on your swimsuit or rent out the special bathing wear for 400 yen to enjoy the mixed-gender bath. Bathing wear is free to rent for male guests when the bath is mixed-gender.
Important: The facility don’t have bathing suits for children. Please bring your swimsuit.
Essential Tips for Your Visit to Sainokawara Onsen
- There is no showering space at Sainokawara Outdoor Bath.
- Hair dryers are not available at Sanowakara Outdoor Bath.
- If you need a face towel or a bath towel, you can purchase them from reception.
- There are bugs around the area, as it is an outdoor bath.
- Avoid visiting Sainokawara Outdoor Bath from late morning to afternoon on a hot sunny day. There is no shade to hide under when using the hot spring pool.
- The stone pavements leading to Sainokawara Outdoor Bath will be slippery when wet.
Sainokawara Outdoor Bath’s Opening Hours and Admission Fee
- Sainokawara Outdoor Bath is open from
- 7 am to 8 pm from April to November
- 9 am to 8 pm from the 3rd of December to March
- The last admission is 30 minutes before closing time.
- The admission cost is
- 800 yen for adults
- 400 yen for children from the age of 3 to elementary school students
How to Get to Sainokawara Outdoor Bath from Yubatake
- Sainokawara Outdoor Bath is around a 15 to 20-minute walk from Kusatsu Onsen’s Yubatake and a 25 to 30-minute walk from Kusatsu Onsen Bus Terminal.
FAQ About Sainokawara Outdoor Bath
Does Sainokawara Outdoor Bath allow mixed-gender bathing?
Yes, but only during specific times. The facility operates on a gender-separated basis for the majority of the week. However, every Friday evening, the baths switch to a mixed-gender format, allowing guests of all genders to bathe together.
Is it required to wear a swimsuit during the mixed-gender sessions?
There is no hard rule requiring you to cover yourself during mixed-gender sessions at Sainokawara Outdoor Bath. However, wearing a swimsuit or renting a special bathing suit is highly recommended.
Outside of these Friday sessions, traditional Japanese bathing rules apply, and swimsuits are not permitted.
Are there showers or changing facilities available on-site?
Sainokawara is a traditional rotenburo (outdoor bath) designed for soaking in the natural spring water. It does not have standard shower stalls or amenities like soap and shampoo. You should shower at your hotel or a different local bathhouse before visiting. Lockers are available for your clothes and valuables.
Is the Sainokawara Outdoor Bath tattoo-friendly?
Yes. We have confirmed with the staff that Sainokawara Outdoor Bath is tattoo-friendly.
How long does it take to walk to the bath from the Yubatake?
The walk from the iconic Yubatake (the center of Kusatsu) through Sainokawara Park takes approximately 15 to 20 minutes. The path is scenic and takes you through a park with smaller hot spring streams, making for a pleasant stroll.
Is the water at Sainokawara very hot?
The water in the bath is natural spring water from the Bandai source, which is highly acidic and naturally hot. Because the bath is very large, the temperature can vary significantly depending on where you sit.
Areas closer to the hot spring source are typically the hottest, while those near the edges or drainage points are generally cooler.
Discover Other Attractions in Kusatsu Onsen
Sainokawara is undoubtedly a highlight of the onsen town, but it is just one piece of the puzzle that makes Kusatsu a world-class destination. To make the most of your trip, check out our Complete Guide to Kusatsu Onsen, where we cover the best ryokan stays, local transport tips, and the must-see Yumomi performances at the Yubatake.
We also introduce interesting shops, delicious cafes, and how vegetarians and vegans can survive in the rural town!
