Top 10 Recommended Secret Hot Springs in Fukushima - From Wild Onsen to Accommodating Ryokan

Fukushima Prefecture is renowned as one of Japan's premier hot spring destinations, particularly celebrated for its abundance of hidden hot springs. Nestled in mountainous areas within Bandai-Asahi National Park and Nikko National Park, the region offers diverse hot springs ranging from wild natural baths to historic single-inn retreats. This article introduces ten carefully selected secret hot springs in Fukushima Prefecture.

1. Numajiri Onsen Motoyu (Inawashiro Town)

2. Tokusa Onsen Iwaburo (Minamiaizu Town)

3. Futamata Onsen Daimaru Asunaroso (Tenei Village)

4. Takayu Onsen Adachiya

5. Takayu Onsen Tamagoyu

6. Makukawa Onsen Mitoya Ryokan

7. Washikura Onsen Kogen Ryokan (Fukushima City)

8. Kashi Onsen Ryokan Daikokuya (Nishigo Village)

9. Nakanosawa Onsen Onyado Manyotei (Inawashiro Town)

10. Oze Hinoemata Onsen Hiuchi no Yu (Hinoemata Village)

Conclusion

Fukushima Prefecture's hidden hot springs offer diverse attractions, from wild onsen to single remote inns. All are committed to source water flow-through with no dilution or heating, providing hot spring experiences in harmony with nature.

Why not embark on a journey to heal mind and body at a mountain hidden hot spring surrounded by primeval beech forests, away from daily hustle and bustle?

Notes

• While the information represents the latest available at the time of research, there may be errors. Please verify the most current information on official websites.
• Many facilities close during winter, so please confirm operating status before visiting.
• Day-use bathing hours and fees are subject to change.
• Wild onsen (rock baths, Numajiri Motoyu) may be unavailable depending on weather and water levels. Numajiri Motoyu in particular is a dangerous location with toxic hydrogen sulfide gas, and guided tour participation is mandatory. Individual visits are extremely dangerous. Period: Year-round

4. Takayu Onsen Adachiya (Fukushima City)

Takayu Onsen, quietly nestled in the mountains at 750 meters altitude, boasts over 400 years of history and is counted among the "Three Great Hot Springs of Oshu" along with Yamagata's Zao Onsen and Shirabu Onsen. Known for its rare high-concentration sulfur springs, it has repeatedly won first place in Jalan's Hot Spring Destination Satisfaction Rankings.

Adachiya is the oldest established ryokan in Takayu Onsen, having completed renovation of its large bath in July 2025. The signature large outdoor bath "Taiki no Yu" is shaped like a river and features waterfall bathing, lying-down bathing, and cave bathing. Two lounges were also newly established in 2024, where guests can enjoy beverages throughout their stay.

Dinner is a course meal enjoyed while grilling seafood and mountain delicacies over an irori hearth. The head chef holds qualifications as both sommelier and sake taster, with deep commitment to food and drink pairings.

• Spring Quality: Sulfur-containing calcium/aluminum sulfate spring (hydrogen sulfide type)
• Source water flow-through
• Bathing Facilities: Indoor baths=2, large outdoor baths=2 (alternating for men/women), private outdoor baths=2, private indoor bath=1
• Source Temperature: 46.3°C
• pH: 2.7
• No dilution or heating
• Day-use Bathing: Suspended until around April 2025 due to construction
• Accommodation: Available (junior high school age and above only)
• Operating Period: Year-round

5. Takayu Onsen Tamagoyu (Fukushima City)

Also a hidden hot spring in Takayu Onsen, Tamagoyu is an established ryokan founded in 1868. It was named because bathing makes skin as smooth as an egg, and the smell resembles boiled eggs.

The garden contains a thatched-roof bathhouse that preserves the atmosphere from the founding era, evoking 150 years of history. Visitors can enjoy white cloudy spring water that has been naturally flowing for 400 years at seven different bathing facilities. The ryokan is committed to 100% source water flow-through with no dilution or heating.

During the post-war high economic growth period, Takayu Onsen imposed a self-restriction of "no entertainment," going against the times to preserve the traditional atmosphere of a hot spring cure resort. This attitude has led to today's blessings.

• Spring Quality: Acidic sulfur-containing aluminum/calcium sulfate spring (hydrogen sulfide type)
• Source water flow-through
• Bathing Facilities: Indoor baths=2, outdoor baths=5
• Source Temperature: 44°C
• pH: 2.8
• No dilution or heating
• Day-use Bathing: Available (adults 1,000 yen) 10:00-15:00
• Accommodation: Available
• Operating Period: Year-round

6. Makukawa Onsen Mitoya Ryokan (Fukushima City)

Makukawa Onsen, located in Bandai-Asahi National Park at approximately 1,300 meters altitude on the slopes of Mount Azuma, is a hidden hot spring founded in 1891. It is also a member of the Association to Preserve Japan's Secret Hot Springs.

The ryokan has two source springs - the indoor bath uses "simple spring" while the outdoor bath "Saeri no Yu" located in a separate area uses "simple sulfur spring," allowing visitors to enjoy two different spring qualities at once. The particularly popular "Saeri no Yu" along the mountain stream features beautiful bluish milky-white source water flowing through.

Surrounded by primeval beech forests and a treasure trove of untouched nature, the area features a pond connected directly to natural mountain streams stocked with yamame trout, iwana char, and carp. Mornings begin with the scent of sulfur.

• Spring Quality: Simple spring, simple sulfur spring
• Source water flow-through
• Bathing Facilities: Indoor baths=2, outdoor baths=2
• Source Temperature: 44.9°C, 72.5°C
• No dilution or heating
• Day-use Bathing: Available (adults 600 yen)
• Accommodation: Available
• Operating