Kusatsu is recognised by the steam rising from Yubatake, a hot spring source in the middle of town. Hot water runs through wooden channels that cool it before it is distributed to the baths. The square is surrounded by shopping lanes, ryokan inns and bathhouses; it is more than a photo stop and helps explain why daily life is organised around the water. A yumomi performance at Netsunoyu shows another way to regulate the temperature without adding cold water.
A relaxed route begins with a walk around the channels and time to watch them in daylight. The streets toward Sainokawara pass confectionery shops, craft stores and manju steamed with hot-spring heat. The outdoor bath is about a 12-minute walk from Yubatake. The incline is gentle, but wet paving or snow can make the route slippery; leave shopping and luggage at your accommodation and bring only what you need for bathing.
Sainokawara Rotenburo contrasts with smaller indoor baths: its large open-air pool sits among trees and changes with the seasons. Bathing is normally separated by gender; on Friday evenings, the facility advertises a mixed-bathing period with swimwear or a towel and specific rules. Check the last-entry time, because admission closes before the facility itself. Visitors who only want a walk can enter the park for free and stop at its footbaths without using the rotenburo.
Access to Yubatake and the park walk is free; the bath costs ¥800 for adults and ¥400 for children aged 3–12. It opens at 7 am in spring, summer and autumn, and at 9 am in winter; closing time is 8 pm year-round, with last admission at 7:30 pm. Visitors often praise the scale and landscape, while noting that some amenities, such as showers inside the bathing area, are limited. Bring your own towel and follow onsen etiquette.
Walking back lets you see Yubatake illuminated. From Tokyo, a direct highway bus takes about four hours; by rail, travel to Naganohara-Kusatsuguchi and continue by local bus for about 25 minutes. Check the last service to your accommodation or station before setting out, and leave time to change after bathing. That buffer lets the afternoon combine water history, lanes and an onsen without rushing.
To plan a visit to Kusatsu, check official notices and allow for weather, closures and the return journey. The best itinerary leaves time to enjoy the place without turning it into a race.
Profiles of the recommended places: Yubatake · Sainokawara Open-Air Bath
To plan a visit to Kusatsu, check official notices and allow for weather, closures and the return journey. The best itinerary leaves time to enjoy the place without turning it into a race.
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Yubatake
Kusatsu, Kusatsu-machi, Agatsuma District, Gunma 377-1711, Japan
Yubatake—literally a “hot-water field”—is the visual and practical centre of Kusatsu Onsen. Mineral-rich water emerges in clouds of steam, runs through wooden channels and cools before reaching the baths. This is more than a decorative spring: it shows part of the system that supports the hot-spring
Central Kusatsu is free to enter and remains accessible, although nearby shops and restaurants keep their own hours. The town’s tourism information lists +81 279-88-7188 for enquiries and provides transport guidance. Direct highway buses run from Tokyo, while a rail route reaches Naganohara-Kusatsuguchi before a local bus connection. In the centre, Yubatake, public baths and Sainokawara can all be reached on foot.
Kusatsu’s best-known hot-spring source, with wooden channels that cool and distribute water before it reaches the baths.
Sainokawara Open-Air Bath
521-3 Kusatsu, Kusatsu-machi, Agatsuma District, Gunma 377-1711, Japan
Sainokawara’s outdoor bath extends a walk from Yubatake into a more open landscape, where steam rises among trees and volcanic rock. The facility covers about 500 square metres; under normal operation, bathing areas are separated for men and women. The walk from the centre takes about 12 minutes alo
Official admission is ¥800 for adults and ¥400 for children aged 3–12. Hours are 7 am–8 pm from April through November and 9 am–8 pm from December through March; last entry is 7:30 pm. Every Friday from 5:30–8 pm, the men’s bathing area is open for mixed bathing, and visitors may wear swimwear or cover themselves with a towel, according to the official information. Bring your own towel if you prefer not to buy one, and check current rules before walking up from Yubatake.
A communal open-air hot-spring bath of about 500 square metres, surrounded by forest and linked to a walking route from Yubatake.
Sources & references
Sources for the information and reporting discussed in this guide.
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Official website of Yubatake ↗
Primary source
Gunma Official Tourist Guide · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Official website of Yubatake ↗
Primary source
Kusatsu Onsen Official Tourism Association · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Official website of Sainokawara Open-Air Bath ↗
Primary source
Sainokawara Rotenburo official website · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Official website of Sainokawara Open-Air Bath ↗
Primary source
Kusatsu Town official website · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Official website ↗
Primary source
Gunma Official Tourist Guide · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Official website ↗
Primary source
Sainokawara Rotenburo official website · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Official website ↗
Primary source
Kusatsu Town official website · Accessed October 12, 2026
Primary source for identity, concept, menu, and contact details.
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Google review summary for the exact Yubatake landmark ↗
Secondary source
Wanderlog · Accessed October 12, 2026
4.6/5 from 17,980 Google reviews for Yubatake, checked 2026-10-12; visitors praise steam and illumination, while noting the strong mineral smell.
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Google review summary for the exact bath ↗
Secondary source
Wanderlog · Accessed October 12, 2026
4.4/5 from 6,102 Google reviews for the bath, distinct from Sainokawara Park; comments praise size and setting while noting limited shower amenities.
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Visitor feedback for the exact Yubatake ↗
Secondary source
Wanderlog · Accessed October 12, 2026
4.6/5 from 17,980 Google reviews, checked 2026-10-12.
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Visitor feedback for the exact Sainokawara bath ↗
Secondary source
Wanderlog · Accessed October 12, 2026
4.4/5 from 6,102 Google reviews, checked 2026-10-12.