Kusatsu Onsen 2027: Complete Guide to Japan's Top Hot Spring Town
2027-01-15· Updated 2026-10-25 · 9 min read
Kusatsu's Yubatake pumps out 4,000 litres of hot spring water a minute in the centre of town. Here's the 2027 winter guide — Netsunoyu yumomi performance, Sainokawara outdoor bath, and the Tokyo day trip plan.
Kusatsu Onsen is Japan's hot-spring capital by every measure — most volume (32,300 litres a minute), most acidic water (pH 2), most-visited winter onsen town, and the one place where the hot-spring pool sits in the exact centre of town as a visible civic landmark. The Yubatake is the icon. Winter here is the signature season.
💡Last content review: October 2026
Yumomi performance ¥800 adult / ¥400 child confirmed 2026 (japanactivity.com); tickets sold same-day — arrive 15-20 minutes early. Confirm times at kusatsu-onsen.ne.jp.
⚡♨️ Top onsen ryokan don't stay open long
Famous ryokan have few rooms, so weekends and holidays go quickly. Book early, or aim for a weekday if you want more choice.
Quick facts: Kusatsu Onsen 2027
| What | Detail | Book |
|---|---|---|
| Location | Agatsuma, Gunma — northwest of Tokyo | 🏨 Book |
| Yubatake flow rate | 4,000 L/min centre field (32,300 L/min total) | 🏨 Book |
| Water chemistry | Acidic sulphur, pH 2.1 — strong | |
| Netsunoyu yumomi performance | ¥800 adult / ¥400 child; same-day tickets | 🏨 Book |
| Public outdoor bath (Sainokawara) | ¥700 adult / ¥350 child, 7:00-20:00 | 🏨 Book |
| Sotoyu (free public baths) | 19 free local baths around town | |
| Best season | Winter — illuminated Yubatake + snow | |
| From Tokyo | JR Tokaido/Agatsuma + bus, 3h 15min | 🏨 Book |
| Day trip possible? | Yes but overnight ryokan strongly recommended |
The town's logic is simple: hot spring water comes out so hot (over 50°C) that it must be cooled before bathing. Yumomi — the traditional method of stirring with 180 cm wooden paddles — is Kusatsu's signature performance, done daily at Netsunoyu bathhouse by yukata-clad locals who sing while they stir.
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What to do
- ●Yubatake field at night — illuminated nightly; Kusatsu's defining image
- ●Netsunoyu yumomi performance — 15 min stirring + bathing demo; 5-6 slots daily
- ●Sainokawara Open-Air Bath — biggest outdoor onsen in the area, snow-rim view
- ●Yumomi + Odori song show — joint cultural + onsen performance
- ●Free sotoyu bath hop — 19 free local neighbourhood baths; ask ryokan for pass
Getting there from Tokyo
- ●Fastest: JR Agatsuma line limited express Kusatsu, 2.5 hr from Ueno to Naganohara-Kusatsuguchi + JR Kanto bus 25 min, ¥6,000
- ●Overnight bus: JR Kanto highway bus from Shinjuku, 4 hr, ¥3,000-4,000
- ●Driving: 3.5 hr from central Tokyo; parking at town-centre lot
Kusatsu Onsen day trip from Tokyo (Klook)
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Where to stay
Stay at a ryokan within 5 minutes walk of Yubatake — Hotel Ichii, Nakazawa Village, Kiyoshigekan are English-friendlier. The ryokan dinner + onsen + yukata stroll to the illuminated Yubatake is Kusatsu's single best experience, and impossible as a day trip. Peak weeks (Dec-Jan + sakura) book 4+ months ahead.
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Bookable experiences
- ●Kusatsu day trip from [Tokyo](https://www.booking.com/searchresults.html?ss=Tokyo&aid=8095781&label=auto-tokyo-autolink&nflt=review_score%3D80&order=popularity) — bus + Yubatake + Netsunoyu, ¥14,000 (Klook)
- ●Kusatsu + Karuizawa 2-day combo — famous resort town pairing
- ●Yumomi performance pre-[ticket](https://www.klook.com/en-US/search/?query=Japan&tp_sub=japan) — reserved via Netsunoyu website
- ●Winter ski + onsen combo (Kusatsu Kokusai) — small ski resort in same town
Kusatsu tours + Tokyo day trips (Klook)
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Kusatsu Yubatake-front ryokan sell out 3 months ahead
- Walk-to-Yubatake ryokan supply is capped at ~30 properties
- Winter weekends + public holiday weeks are the highest demand
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FAQ
- ●Can I bathe at Yubatake directly? No — it's a hot-water field, not a bath; actual bathing happens at surrounding onsens.
- ●Water too hot for bathing? Yes — Kusatsu cools water via yumomi stirring; you bathe at 42-45°C.
- ●Tattoo-friendly? Netsunoyu + Sainokawara are stricter; some ryokan allow with cover-sticker. Call ahead.
- ●Best time to see Yubatake lit? Nightly 17:00-21:00; especially magical with snow + yukata locals.
- ●Yumomi show in English? Narration mostly Japanese; dance + performance is visual.
- ●Day trip workable? Yes but you'll miss night illumination + Netsunoyu's last show.
- ●Can I combine with Karuizawa? Yes — 1 hr by car, pair as a 2-day Gunma loop.
- ●Free baths — really free? Yes, 19 neighbourhood sotoyu for locals + tourists; some ask ¥100 token.
- ●Family-friendly? Yes — Netsunoyu performance works for kids; Sainokawara is wide + safe.
- ●Winter transport issues? Buses sometimes delayed by snow; add 30 min buffer.
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