10 Hidden Hot Springs in Yamagata - A Journey Through Remote Mountain Onsen

Yamagata is a "Hot Spring Kingdom," with natural springs rising in every one of its 35 municipalities. Hemmed in by the Ou Mountains and the Asahi–Iide ranges, and opening onto the Shonai plain by the Sea of Japan, the prefecture divides into four regions — Okitama, Murayama, Mogami and Shonai — each with hot springs of a distinct character.

The heart of it lies in the south, around Yonezawa, where the folds of the Azuma mountains hold a cluster of mountain springs known as the "Yonezawa Hachito" (the Eight Hot Springs of Yonezawa). Among them are Ubayu, the highest hot spring in the prefecture at 1,300 meters; Shintakayu, with a bath carved from a 250-year-old chestnut tree; and Ohira, reached only by crossing a suspension bridge over a gorge. Each is a solitary or small source-fed inn tucked deep in the hills. Many require a walk from where the car stops, and in winter they are sealed in by snow. In exchange for the difficulty of getting there, you get the water — and the surrounding nature — almost to yourself.

Head north from Yonezawa and the character shifts toward the old therapeutic-bathing (toji) tradition. Hijiori Onsen, with 1,200 years of history; Ginzan Onsen, famous for its Taisho-era streetscape; and the Semi and Akakura springs of Mogami, tied to legends of the warrior Yoshitsune. Drop further toward Shonai and you reach Yudagawa Onsen, the retreat behind Tsuruoka in the home country of the novelist Shuhei Fujisawa, and Yunose Onsen at the foot of Mt. Gassan — quiet inns that still keep their springs on the edge of the plain.

This guide focuses on Yamagata's stay-and-soak hidden springs — inns, most of them source-fed (kakenagashi), where an overnight stay is the natural way to enjoy the water. It runs from the mountain baths of Yonezawa, through the cure towns of Murayama and Mogami, and north into the Shonai plain, with a day-trip bath added at the end.

1. Ubayu Onsen (姥湯温泉) — Yonezawa City

2. Shintakayu Onsen Okushirabu Azumaya Ryokan (新高湯温泉 奥白布 吾妻屋旅館) — Yonezawa City

3. Ohira Onsen Takimiya (大平温泉 滝見屋) — Yonezawa City

4. Shirabu Onsen (白布温泉) — Yonezawa City

5. Onogawa Onsen Takasagoya (小野川温泉 高砂屋) — Yonezawa City

6. Shizu Onsen Maizuruya (志津温泉 まいづるや) — Nishikawa Town, Nishimurayama District

7. Hijiori Onsen Yuyado Motokawarayu (肘折温泉 湯宿 元河原湯) — Okura Village, Mogami District

8. Semi Onsen Kishiro (瀬見温泉 喜至楼) — Mogami Town, Mogami District

9. Akakura Onsen Yumori no Yado Sannojo (赤倉温泉 湯守の宿 三之亟) — Mogami Town, Mogami District

10. Zao Onsen Omiya Ryokan (蔵王温泉 おおみや旅館) — Yamagata City

11. Ginzan Onsen (銀山温泉) — Obanazawa City

12. Yudagawa Onsen Hayato Ryokan (湯田川温泉 隼人旅館) — Tsuruoka City

13. Yunose Onsen Yunose Ryokan (湯の瀬温泉 湯の瀬旅館) — Tsuruoka City

For a Day Trip

14. Zao Onsen Dai-Rotenburo (蔵王温泉 大露天風呂) — Yamagata City

Summary: Before You Set Out for Yamagata's Hidden Springs

Yamagata's hidden springs are easiest to plan by its four regions: Okitama (Yonezawa), Murayama, Mogami and Shonai. Terrain and climate differ across them, and winter-closed inns sit alongside year-round ones — worth keeping in mind first.

Okitama: the mountain baths of Yonezawa. The "Yonezawa Hachito," rising in the folds of the Azuma range, form the core of Yamagata's hidden springs. Ubayu, the prefecture's highest inn at 1,300 meters, is reached by a 15–20 minute walk up a mountain path from the parking area; its open-air baths, hemmed in on three sides by sheer cliffs, are as remote as hot springs get. Shintakayu Onsen Okushirabu Azumaya Ryokan sits at the foot of Tengendai in the western Azuma, with several source-fed open-air baths; in winter, access is by the inn's own shuttle. Ohira Onsen Takimiya overlooks the headwaters of the Mogami River, reached on foot across a suspension bridge — day bathing is offered, but the up-and-down mountain walk makes an overnight stay the more relaxed choice. Shirabu Onsen is an old spring of more than 700 years, counted among the "Three Takayu of Oshu" and known for its waterfall bath. Takasagoya at Onogawa Onsen — Yonezawa's nearer hot-spring retreat — keeps a source-fed bath in a walkable spa town, a different flavor from the deep-mountain inns. Across the area, the local Yonezawa beef is a draw in its own right.

Murayama: the foot of Mt. Gassan. Shizu Onsen Maizuruya lies in Nishikawa Town, at a trailhead for Mt. Gassan. It stands along the old Rokujuri-goe road once crossed by pilgrims to the Three Mountains of Dewa, and is buried in heavy snow in winter — a solitary mountain inn that also serves as a base for summer hiking.

Mogami: a lineage of cure towns. Hijiori Onsen Yuyado Motokawarayu stands by the Dozan River in Hijiori, a toji town said to have 1,200 years of history; it draws its own source and offers a top-floor view bath and a riverside private bath. The surrounding Okura Village, listed among the "Most Beautiful Villages in Japan," and its spring-to-autumn morning market are part of the appeal. Along the Ogunigawa River, Semi Onsen Kishiro is a historic wooden inn in an old spring linked to legends of Yoshitsune and Benkei. In the same watershed, Akakura Onsen Yumori no Yado Sannojo keeps a spring said to have been opened by the priest Jikaku Daishi, in a riverside spa town that still carries its old atmosphere. Both preserve the feel of mountain-gorge toji bathing.

Murayama: Zao and Ginzan. Zao Onsen Omiya Ryokan stands in Zao Onsen, celebrated for its strongly acidic sulfur spring of around pH 1.5 — the milky "beauty-making water," served here source-fed. Zao is open year-round, and many visitors come in winter to combine bathing with skiing. In Obanazawa City, Ginzan Onsen is a hot-spring town where Taisho-era wooden inns line both banks of the Ginzan River; the streetscape lit by gas lamps at night is dreamlike, and the snow scenery is exceptional. Here the townscape itself is the destination — one of Yamagata's signature springs.

Shonai: the springs behind Tsuruoka. Yudagawa Onsen Hayato Ryokan sits in Yudagawa Onsen, the retreat behind Tsuruoka said to have 1,300 years of history, close to the home country of the novelist Shuhei Fujisawa and known for its spring bamboo shoots (moso). Also in Tsuruoka but back in the hills, Yunose Onsen Yunose Ryokan is a quiet solitary inn at the foot of Mt. Gassan, keeping a plain source-fed bath where the plain gives way to the mountains.

For a day trip. Zao Onsen Dai-Rotenburo is an open, riverside outdoor bath that accepts day visitors only, with no lodging. Open from spring through autumn, its large pools can hold around 200 bathers amid the forest — a good stop when visiting Zao.

The mountain springs of the Yonezawa Hachito and Shizu are mostly closed in winter, with spring through autumn the best time to visit; Zao, Ginzan, Hijiori and the Shonai inns run year-round and offer snow-viewing baths. If you move between regions, remember that Okitama and Shonai are several hours apart by car even within the same prefecture — it is more realistic to pick one or two areas and plan on at least two or three days.

Frequently Asked Questions

Q. When is the best time to visit Yamagata's hidden springs? A. The mountain springs of the Yonezawa Hachito (Ubayu, Ohira and others) and Shizu mostly operate from late April to early November, and are loveliest in the fresh green of early summer and the autumn foliage. If you want to bathe in winter too, choose the year-round inns at Zao, Ginzan, Hijiori or in Shonai, where soaking amid the snow is a highlight in itself.

Q. Can I get there without a car? A. Zao Onsen, Ginzan Onsen and Yudagawa Onsen in Shonai are relatively easy to reach by public transport and inn shuttles. The mountain springs — Ubayu, Shintakayu, Ohira and Shizu — have limited public transport, and some require a winter shuttle. Confirm the access route with each inn in advance.

Q. Is day-trip bathing available? A. Many inns accept day visitors, but hours and closed days vary by facility, and some limit day bathing on nights when guests take priority. To be sure of the water, an overnight stay is best. A few baths, such as Zao Onsen Dai-Rotenburo, are day-visit only.

Q. How many springs can I cover in one trip? A. Yamagata is long from north to south, and Okitama (Yonezawa), Murayama, Mogami and Shonai are several hours apart by car. Rather than trying to see the whole prefecture, focus on one or two regions over at least two or three days to enjoy the water at an unhurried pace.

The information in this article (admission fees, operating hours, water quality data, access, etc.) is based on research conducted at the time of writing. Details may have changed or contain errors. Please verify the latest information on each facility's official website or through the local tourism association.