15 Hidden Hot Springs of Fukushima - From Azuma Mountain Inns to the Famed Waters of Aizu
Fukushima is one of Japan's foremost hot spring regions. A volcanic belt running from the Ou Mountains through the Azuma range and into the mountains of Aizu has given rise to a remarkable variety of springs across the prefecture. Sheltered within Bandai-Asahi National Park and Nikko National Park, the mountains still hold single-inn retreats opened in the Edo and Meiji eras, many of them members of the "Association to Preserve Japan's Secret Hot Springs."
The Azuma range rising behind Fukushima City is the prefecture's greatest treasury of hidden hot springs. From Takayu Onsen at 750 meters to Makukawa and Noji Onsen near 1,300 meters, sulfur-scented waters dot the mountainsides - milky white baths, river-shaped open-air pools, and wild baths ringed by primeval beech forest, all the kind of bathing found only at remote mountain inns. Venture into Aizu and travelers are welcomed by historic waters: the gorge-side Ashinomaki, Futamata in Minami-Aizu, and Kashi in the far south of the prefecture.
This article introduces 15 carefully chosen hidden hot springs in Fukushima. We begin with 12 hot springs where you can stay and soak at leisure, arranged by area, then add three more to enjoy as wild onsen or day baths. Every inn is a real facility, and each hot spring's detail page lets you check availability and rates or proceed to booking. As most are remote mountain inns, we recommend confirming winter closures and road conditions in advance.
Please note that water handling (dilution, heating, circulation), spring quality, and day-use availability differ by facility. Check the individual pages below for the latest details on each.
1. Takayu Onsen Tamagoyu (Fukushima City, Fukushima)
Summary - What to Know Before Touring Fukushima's Hidden Hot Springs
It helps to divide Fukushima's hidden hot springs into four areas: the Azuma range (Fukushima City), Inawashiro/Bandai, Aizu/Minami-Aizu, and the far south around Shirakawa. If accommodation is your focus, the Azuma range - where the inns cluster - makes the natural starting point.
[Azuma Range / Fukushima City] Takayu Onsen is an old sulfur-spring resort at 750 meters, counted among the "Three Great Takayu of Oshu." Tamagoyu is a single inn founded in 1868, still keeping its thatched-roof bathhouse, while Adachiya, another long-established inn, is famed for a large river-shaped open-air bath. Climbing higher along the Bandai-Azuma Skyline you reach Okutsuchiyu's Kawakami Onsen, then, near 1,300 meters, Makukawa Onsen (Mitoya and Yoshikuraya), Shin-Noji Onsen, the Noji Onsen Hotel, and Washikura Onsen - a run of mountain inns wrapped in beech forest. Many of these high-altitude inns close in winter with the roads shut, so always confirm the season and operating status.
[Inawashiro / Bandai] Nakanosawa Onsen draws from the Numajiri source, one of the highest-yielding in Japan, and Oyado Manyotei is one of its inns. The nearby Numajiri Onsen Motoyu is a powerful wild onsen gushing in the mountains - but it is a dangerous site emitting toxic hydrogen sulfide gas, and entering alone is extremely hazardous. Please join a guided tour.
[Aizu / Minami-Aizu] Aizu Ashinomaki Onsen lies along the gorge of the Okawa (Aga River), and the Marumine Kanko Hotel is a stay-oriented inn overlooking the ravine. In Minami-Aizu, Futamata Onsen's Daimaru Asunaroso is known as the inn whose owner served as the first chairman of the Association to Preserve Japan's Secret Hot Springs, celebrated for its riverside open-air bath. Also in Minami-Aizu, the Tokusa Onsen Iwaburo is a rustic communal bath carved from riverside rock, mainly for day use with no lodging. Deeper still, in Hinoemata Village at the gateway to Oze, is the Hiuchi no Yu, a village-run day-use bath.
[Far South / Around Shirakawa] In Nishigo Village, the single inn Kashi Onsen Ryokan Daikokuya stands at the headwaters of the Abukuma River, known for its deep "Oiwaburo" rock bath. Easily reached from Shinshirakawa Station on the Tohoku Shinkansen, it also makes a convenient base for touring the south of the prefecture.
For a stay-centered trip, one night in the Azuma range and a second in Aizu or the south makes a realistic two-night, three-day itinerary. Since many high-altitude inns close in winter, plan the mountain baths for the snow-free season and keep the year-round inns as winter options. Wild onsen and communal baths (Numajiri Motoyu, Tokusa Iwaburo) may be unavailable depending on weather and water levels.
The information in this article (bathing fees, hours, spring data, water handling, etc.) is based on research at the time of writing. Errors or changes may occur. Please confirm the latest details on each facility's official website or with local tourism associations. In winter especially, many facilities close or roads are shut, so we strongly recommend confirming before you visit.
