Outdoor onsen (rotenburo) in Gunma

Kusatsu · Multiple reviewers from August and July 2026 confirm outdoor bath is available; one notes male outdoor bath was under construction mid-August.

Tsumagoi · Outdoor bath (Gokuraku Yu) located 80–100 meters from main building, requires walking outside in day clothes; accessible to day-use guests.

Takasaki · Has an outdoor bath area with a large rotenburo and outdoor rest spaces.

Annaka · An outdoor bath is widely confirmed.

Numata · Open-air rotenburo with river-terrace and mountain views is the facility's main draw.

Ota · Multiple varied outdoor baths (roughly 4-5 types) including jet baths and a carbonated bath.

Shibukawa · One outdoor bath described as relatively spacious; separate foot bath outside.

Numata · Multiple reviewers describe two outdoor baths of different sizes.

Shibukawa · Reviews confirm multiple outdoor baths with mountain views from upper levels.

Maebashi · A substantial outdoor bath area with multiple tubs and an outdoor rest zone is a repeated highlight.

Maebashi · One outdoor bath is present.

Minakami · Multiple reviews describe outdoor baths with lake views of Akaya Lake; two types named and .

Katashina · Multiple outdoor baths with mountain views are the facility's main draw.

Shibukawa · Visitors consistently report outdoor bath (rotenburo) and barrel sauna with good views; outdoor washing area also available.

Shibukawa · Outdoor bath and garden bathing area are available; described as having open-air ambiance and garden furniture.

Maebashi · There is a separate outdoor bath area alongside the indoor baths.

Minakami · Outdoor bath overlooking river and waterfall confirmed by numerous visitors; requires stairs to reach.

Takasaki · An outdoor bath exists (reviewers count just one); opinions vary on its temperature and view.

Isesaki · Has an outdoor bath area with a hot spring-fed tub plus a carbonated tub, described positively across four reviews.

Shibukawa · Multiple reviews confirm outdoor baths on the 8th floor and elsewhere; 2026-03 to 2026-08.

Isesaki · Multiple outdoor baths including a source-fed reclining bath and a hot cypress (hinoki) bath.

Takasaki · Multiple outdoor baths including a mineral-crusted rock bath are widely praised.

Ota · Multiple reviewers describe outdoor cypress, stone and tsubo baths.

Tomioka · The outdoor bath has a scenic view and reopened around June 2026 after an extended water-shortage closure that ran through spring 2026 — worth confirming it is currently open before visiting.

Higashiagatsuma · Multiple reviewers describe both an indoor and outdoor bath.

Annaka · An outdoor bath is available alongside the indoor tubs.

Maebashi · Has a spacious outdoor bath, also fed by the natural spring.

Yoshioka · A substantial outdoor bath area with multiple tub types.

Naganohara · A small outdoor bath alongside the indoor bath, confirmed repeatedly.

Maebashi · There is an outdoor bath area in addition to the indoor tubs.

Kusatsu · Face bath and foot bath located outside the main bath; source spring visible.

Isesaki · Multiple reviewers confirm an outdoor bath area, with one counting four separate outdoor tubs.

Shibukawa · Rooftop outdoor bath on 8th floor (gender-swapped morning/evening); separate gender-separated baths (stone and cypress). No washing stations at the rooftop.

Yoshioka · A spacious, open outdoor bath area is a highlight, mentioned across many reviews.

Maebashi · A roofed, open-air-style outdoor bath exists, though one reviewer called it plain-looking.

Kiryu · A small outdoor bath (4-person capacity) exists, but one reviewer reports the larger outdoor bath was closed for maintenance for an extended period.

Tsumagoi · Outdoor bath exists but is frequently closed in winter (Jan–Feb 2026, Dec 2025) and sometimes in other seasons.

Kusatsu · Outdoor bath available alongside indoor baths (July 2026).

Takasaki · Two to three outdoor baths including a carbonated-spring tub and a kakenagashi spring tub.

Minakami · Outdoor bath available; visitors describe it as small but comfortable.

Shimonita · The facility has an outdoor bath area with features like a reclining bath, jar bath, and waterfall bath, though its size and view are described inconsistently.

Kawaba · Widely confirmed indoor and outdoor bath.

Takayama · An outdoor bath is present, generally described as lukewarm.

Ueno · An outdoor bath overlooking the Kannagawa river is the facility's main draw.

Katashina · Large outdoor baths (split into two sections) are the facility's signature feature; multiple reviewers also note slippery moss on the floor and insects in the water.

Maebashi · A sizable outdoor bath area (rock bath plus a lukewarm tub) is consistently mentioned.

Numata · An outdoor bath is confirmed by many reviewers as a highlight.

Numata · An outdoor bath area (three tubs, though one waterfall/uchidase bath is sometimes out of order) is a major highlight for most, though one reviewer felt it's more a roofed pavilion without open sky than a true rotenburo.

Kiryu · Multiple outdoor baths are consistently described, including a covered and uncovered section.

Naganohara · An outdoor bath (rotenburo) is present alongside the indoor bath at nearly every review.

Annaka · An outdoor bath exists, but under the current owner its area has been cut to under half its former size and depth reduced about 20% (kerosene heating cost cited); reviewers also report ants and horseflies and unclear rust/mold debris in the tub.

Showa · An outdoor bath is mentioned by many reviewers.

Higashiagatsuma · Both an indoor and an outdoor bath are available, facing a rocky mountain; one reviewer notes a swallow nest directly above the outdoor tub with droppings visible nearby, a hygiene concern with no posted warning.

Kawaba · An outdoor bath, usually described as noticeably milder/cooler than the indoor one, is present.

Katashina · A small half-outdoor bath is present and generally well liked, though one visitor reported it cold and poorly maintained on their visit.

Shinto · A small outdoor bath is available alongside the indoor tubs.

Takasaki · One small outdoor bath alongside one indoor bath.

Higashiagatsuma · An outdoor bath exists but runs noticeably lukewarm (roughly body temperature to 38C), best enjoyed in warm weather.

Ota · An outdoor bath is present alongside the indoor baths.

Numata · The main baths include both an indoor tub and an outdoor (rotenburo) tub.

Numata · There are two outdoor baths (one warmer, one hotter).

Minakami · The bath is a large outdoor pool only; no indoor bathing facilities.

Takasaki · Both indoor and outdoor baths are available, though the outdoor bath is not large.

Minakami · Facility has an indoor and outdoor bath (rotenburo) overlooking rice terraces, mentioned throughout 2024–2026.

Agatsuma · A 2025 review mentions an outdoor bath in addition to the private bath.

Minakami · Each rental room includes indoor bath and 1–3 outdoor/semi-outdoor baths.

Shibukawa · Open-air bath available alongside indoor bath with good airflow and pleasant sensation (reported June–August 2026).

Kawaba · An outdoor bath is widely confirmed.

Minakami · Reviews from 2025, 2020, 2018 confirm outdoor bath(s); 2023 review mentions small but characterful space; 2022 review found none visible.

Katashina · There is one outdoor bath alongside the indoor bath, consistently praised for its setting.

Minakami · One 2024 review mentions wooden architecture over a small stream, suggesting outdoor or semi-outdoor bathing.

Tomioka · A small outdoor bath overlooks the golf course and Mount Myogi.

Midori · A single rock-style, partly-covered outdoor bath with a seating ledge for half-body soaking.

Tsumagoi · Guest rooms feature hexagonal-shaped private outdoor baths.

Shibukawa · The adjacent hotel has an outdoor bath with scenic qualities (2019-02, 2026-05).

Nakanojo · Two reviews (2023) confirm an outdoor bath accessible from the indoor bath, with scenic autumn foliage views.

Naganohara · A scenic outdoor bath is mentioned by multiple reviewers.

Minakami · Multiple visitors confirmed outdoor bathing areas with good scenery, 2022–2024.

Minakami · Multiple reviews confirm an open-air bath accessible to hotel guests.

Kusatsu · Multiple visitors confirmed a large communal outdoor bath with scenic views.

Tsumagoi · Visitors report an open-air bath with views of the hot spring source.

Takasaki · The women's bath area includes an outdoor tub in addition to the indoor one.

Minakami · Outdoor bath is available as part of main facility.

Nakanojo · Described as a garden open-air bath.