Onsen and baths in Takasaki

A large, recently-renovated super-sento day-spa near Takasaki, open 5am to midnight, with an extensive sauna/cold-plunge setup, multiple indoor and outdoor tubs, private family baths, and an on-site restaurant.

A Showa-era, locally popular day-use hot spring with kakenagashi source water, an outdoor bath, sauna, cold plunge, private bath rooms, and an on-site restaurant.

An aging but well-regarded roadside super-sento near Takasaki IC where every bath, indoor and outdoor, runs on unheated 46-55C iron-tinted sodium chloride kakenagashi spring water, with an outdoor sauna and a large deep cold plunge, though recent reviews report declining maintenance, a roach sighting, and one report that tattoos (even taped over) get you ejected.

A large karaoke-chain super-sento in Misato with many indoor and outdoor tubs, sauna, and a karaoke/restaurant complex, but reviewers confirm it closed permanently on 2025-11-30 (broken fixtures, newly-paid dryers, declining service in its final months) with an unconfirmed reopening under new ownership about a year later.

A no-frills municipal day bath in Kurabuchi with a strongly saline, iron-rich, kakenagashi-leaning brownish spring, one small indoor and one small outdoor tub, no sauna, and no restaurant.

A remote day-and-overnight onsen in the Kurabuchi hills near Takasaki with an unusually strong iron-rich saline spring, indoor and outdoor baths, and a kamameshi restaurant.

A historic 1921 wooden shrine-style neighborhood sento (Takasaki's last remaining public bathhouse), known for very hot bathwater, a fish tank set into the dividing wall, a manga corner, and basket-style (no locker) storage.

A beloved, decades-old wood-fired public bathhouse (sento, not a natural hot spring) in Shinmachi run by an elderly proprietor, extremely retro and worn, that appears to have permanently closed as of May 2024.

A small, indoor-only simple-spring bath attached to a care facility (Keisen-en) near Haruna, with a history of suspending and resuming day-use access, a single narrow tub with time-based gender swaps, and mostly elderly resident bathers.

A business hotel by Takasaki station with a natural hot-spring communal bath (indoor and outdoor, separated by gender) that reviewers describe as scaldingly hot, plus a well-regarded breakfast buffet.

Baths that admit you without an overnight stay

Rotenburo, confirmed by visitors

Gensen kakenagashi, not recirculated

Often with a cold plunge