Ryokan in Zao Onsen

All four reviewed inns are at Zao Onsen in Yamagata, about 40–50 minutes by bus from Yamagata Station. Miyamaso Takamiya and Zao Onsen Kinosato are both a few minutes' walk from the ski slopes, offer a free pickup from the Zao Onsen bus terminal and pour Zao's strongly acidic, sulphurous water with no water or heat added. Miyamaso Takamiya has stood in the old village since 1716, up a stone-stepped lane, and owns three springs of about pH 1.3 to 2.0. Zao Onsen Kinosato is a family-run 20-room inn opened in 1993 at the quiet lower edge of the village beside Shiginoyachi marsh, 5 minutes' walk from the Zao Ropeway; in winter it drives guests to the ropeway for the snow-monster (juhyō) light-up. Zao Onsen Oomiya Ryokan, a 32-room house that claims a thousand years beside Zao's springs, sits on the slope just above the Kamiyu public bathhouse in the old village, 5 minutes' walk from the bus terminal, runs a free shuttle from Yamagata Station's west exit, and draws what it calls Zao's biggest source, about 720 litres a minute from the stone wall beside the building; the inn says all its baths are 100% free-flowing. Zao Onsen Uta no Yado Wakamatsuya, a 21-room inn that traces its founding to 1655, sits on the rise above the village, a 3-minute walk (or free pick-up) from the bus terminal, and pipes its own pH 1.8 sulphur spring, which the inn says reaches the baths with no added water, heating or recirculation.

Miyamaso Takamiya (classic) suits adults who come for food and water: some of Zao's best-loved cooking, with Zao beef, a sukiyaki-shabu-shabu hotpot and abalone, rice cooked in a clay pot at breakfast, several wooden and stone baths, a ¥3,000 private bath and Hinagura, a detached storehouse suite that the inn says is the only room in Zao Onsen with a hot-spring open-air bath, at about ¥22,000–26,000 per person on standard plans. Children aged 12 and under aren't accepted, there's no lift, about 20 stone steps and a maze-like old building, the screened outdoor baths have no view and fill up on busy nights, and the Ria-an Sansui rooms' baths aren't hot-spring water. Zao Onsen Kinosato (classic) suits families and anyone who values warm, personal service: guests are greeted with homemade oshiruko in the lobby, the milky free-flowing bath sits in a hinoki bath house about 30 m across the car park, and generous dinners centre on Yamagata beef sukiyaki or shabu-shabu and the inn's sobagaki hotpot, for about ¥18,000–30,000 per person with two meals. The indoor baths are heated groundwater, not hot-spring water, so reaching the onsen means walking outside (boots and blankets are lent in winter), dinner is in a shared dining room, and 2026 reviewers mention worn rooms, frayed tatami and thin walls. Zao Onsen Oomiya Ryokan (value) is the budget pick, for anyone after Taishō-era nostalgia and Yamagata beef at a fair price: tatami is laid through every corridor and staircase so you walk barefoot from lobby to room, dinner at tables in the Koto or Tarobei restaurant centres on a choice of Yamagata-beef sukiyaki, shabu-shabu or hot-plate grill with Tsuyahime rice, there is a free lounge, and two meals run about ¥15,400–21,000 per person; Japanese guests rate it 4.48 across 1,182 scored reviews on Rakuten Travel. Unlike Takamiya it accepts children from primary-school age, but there is no lift in a long, extended building, its three wooden baths are small and crowd easily (one guest counted four washing stations), the open-air bath closes from late November to early April, there are no private or in-room baths, guests with tattoos may not use the baths, and 2025–2026 reviews mention brusque front-desk replies, dust and some windows facing walls. Zao Onsen Uta no Yado Wakamatsuya (classic) suits anyone after literary history, private bathing and private dining: it calls itself the inn of Saitō Mokichi (1882–1953), the Yamagata-born tanka poet who often stayed, with Saitō Mokichi's calligraphy in a small gallery and guests' own poems lining the corridors; two family baths are free, unbookable and open 24 hours, kaiseki with Yamagata beef is served in private or semi-private dining rooms, a lobby lounge offers free drinks and handmade sweets all day, and standard two-meal plans run about ¥26,000–35,000 per person; Japanese guests rate it 4.75 across 832 reviews on one major site. The inn has moved into a newer building, so the history is in the displays rather than the architecture; the top-floor suites' baths are ordinary water, not onsen, the central air conditioning can't be adjusted, guests with tattoos are asked to use the private baths instead of the shared ones, and 2024–2026 reviews mention dinners some find unremarkable or slow, a sparse breakfast, a cramped changing room, weak showers and a leaking air conditioner in a suite.