Kusatsu Onsen in Gunma: Yubatake, Acidic Waters and How to Plan

Kusatsu Onsen is regarded as one of Japan's leading hot-spring towns. It sits at about 1,200 metres in Gunma Prefecture, north of Tokyo, and is known for its abundant, strongly acidic water, which means a sulphur smell hangs over the town. It suits people who want an authentic onsen atmosphere they can explore on foot in one compact town; it does not suit those who dislike sulphur smell or cool air, or who want nightlife.

Who it suits and how many days

• Suits: couples, families who enjoy hot baths, and anyone wanting a slow rest.
• Skip if: you dislike communal bathing or the sulphur smell, or have very little time.
• Days: one night is enough; two nights if you want to hike or ski in winter.

Best time to go and weather

Being high up, the town is much cooler than the plains all year, making summer a pleasant escape from the heat. Autumn brings foliage on the surrounding mountains. Winter is very cold with snow, and soaking in hot water in freezing air is what many people come for, with a ski resort nearby, though roads may close or be rerouted with snow conditions, so check before travel. Spring arrives later than on the plains, so cherry blossoms bloom later.

Getting there and getting around

From Tokyo there is a limited express from Ueno to Naganohara-Kusatsuguchi Station followed by a bus up the mountain, or a direct highway bus from Tokyo. Route details are in our dedicated transport article. Once there the town is small and walkable, but the streets slope, so wear comfortable shoes and watch for slippery ground in winter.

Must-see sights

The centrepiece is Yubatake, the hot-water field where steaming water runs through wooden channels to cool it, with vapour rising through the middle of town all day and minerals collected from the water for products. In the evening the area is often especially atmospheric with lighting. Then there is Netsu-no-yu, where a demonstration shows the local method of cooling hot water by stirring it with long boards, known as yumomi, at times set by the operator; check the schedule and conditions in advance.

Quieter spots and hidden gems

Sai-no-kawara is a park where a hot stream runs among rocks and trees, pleasant for a cool stroll, with outdoor baths nearby under each venue's own conditions. Back lanes behind the main street hold small shops and a few public bathhouses used by locals, where visitors should follow the rules strictly. Nature lovers may look at walking routes in the surrounding mountains, but the nearby Shirane volcano can have access restrictions depending on alert levels, so check the latest information first.

Areas to know

The heart of town is the Yubatake area, ringed by shops, restaurants and public baths. To the west is the quieter Sai-no-kawara area with its park and outdoor baths. The bus terminal is where you arrive, close enough to walk to the centre. Higher up the town leads toward the ski resort and mountain trails.

Food and souvenirs

Foods to try include onsen eggs, steamed onsen manju buns, and home-style set meals with mountain vegetables. Typical souvenirs are the mineral salts collected from the hot water and local sweets. Shops around Yubatake do not often stay open late, so eat before dark.

Sample budget

The main costs are transport from Tokyo, ryokan lodging that often includes dinner and breakfast, and modest admission to facilities or public baths. Figures vary by season and holiday period, so check directly with the providers. The gap between weekday and long-weekend rates can be large, so compare several dates.

A short sample plan

1. 1Afternoon: arrive and YubatakeDrop bags or check in, then walk around Yubatake and the nearby lanes.
2. 2Evening: soak and dinnerTake a short soak following the lodging's rules, then dinner.
3. 3Next morning: Sai-no-kawaraStroll the Sai-no-kawara park in the cool air, then buy souvenirs before the bus.

In a mountain town where signal can be uneven, mobile data helps with checking bus times and road conditions, and an eSIM installed before departure suits this trip.

일본 eSIM 요금제 보기

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