Onsen and baths in Tsumagoi

An aging but popular day-spa in Tsumagoi with murky brown, near-neutral spring water, a heated/circulated indoor and outdoor bath plus a genuinely source-fed cold bath, sauna, and free rock-bath sauna included in the price, seriously let down by chronically weak or non-functioning showers, a low/inconsistent sauna temperature, and an outdoor bath that is closed for extended stretches (roughly Jan-Mar 2026 for cost/maintenance reasons).

A no-frills, village-run indoor-only day bath near Baragi Highland ski resorts and campgrounds, cheap at 500 yen with a simple sodium-alkaline spring and a small restaurant; one reviewer specifically noted it welcomed visitors with tattoos, but the facility permanently closed on 2026-03-22.

A small, unpretentious local day-use onsen prized for genuine unaltered source-fed water, with a summer-only outdoor bath, two small indoor tubs, reservation-only private baths, and no restaurant.

The large bath of a Kishu Railway hotel in the Kitakaruizawa/Baragi area that uses trucked-in, recirculated and reheated Baragi Onsen water rather than kakenagashi; day-use bathing is offered but unreliably -- closed in winter, sometimes turning away non-guests in high season, and the hotel's own website has listed day-use as available when it was not.

A historic mountain onsen area with an old-style day-use bathhouse fed by free-flowing spring water, alongside a traditional inn offering rooms with private open-air baths.

A rustic, single-tub old-style public bath with no conventional shower stations (bathers rinse under a waterfall-style flow instead), scalding source-fed water, and a strongly divisive lived-in atmosphere.

A small hotel-attached indoor bath convenient for hikers descending Mt. Azumaya, with alkaline (pH 8.8) water but no outdoor bath and no actual mountain view from the tub.

A sulfur, milky-white hot spring bath at the Nisshinkan ryokan in Manza Onsen, reserved for overnight guests only, with three indoor baths and an outdoor bath overlooking the spring source.

Baths that admit you without an overnight stay

Rotenburo, confirmed by visitors

Gensen kakenagashi, not recirculated

Often with a cold plunge