Yamagata · Zao Onsen
Zao Onsen Genshichi Roten-no-Yu
蔵王温泉 源七露天の湯
A day-bathing-only open-air facility beside the spring-fed stream just below the Zao Onsen Grand Open-Air Bath in Yamagata City. Its motto is always the first-bath welcome, and the tubs - fed by some of Zao's most abundant flow - pride themselves on spotless cleanliness. The water is Zao's signature strongly acidic sulfur spring (acidic, sulfur-bearing aluminum sulfate-chloride), free-flowing; praised for joint pain and skin troubles, it is also known as a beauty-skin bath. The spacious rotenburo offers autumn foliage by day and light-ups by night, with yunohana drifting through the milky water. Admission is 550 yen for junior high and up, 300 yen for elementary, free for preschoolers; open 10:00-19:00 (Wednesdays from 14:00). A few minutes by car from the Zao Onsen Bus Terminal - a fine companion to a communal-bath tour.
- Price (adult)
- ¥550
- Hours
- 10:00-19:00
- Closed
- Closed Wednesday mornings (Wednesdays from 14:00)
- Access
- 862-1 Arashiki, Zao Onsen, Yamagata, Yamagata (postal code 990-2301). A few minutes by car from the Zao Onsen Bus Terminal, adjacent to the Zao Grand Open-Air Bath. Tel 023-693-0268.
- Water type
- Sulfur spring
- Tattoos
- Ask ahead
- Phone
- 023-693-0268
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Zao Onsen. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- Some of Zao's most abundant flow; a spotless free-flowing rotenburo promising the first-bath welcome
- Strongly acidic sulfur spring with drifting yunohana; autumn foliage and night light-ups
- 550 yen adults / 300 yen elementary / preschoolers free; 10:00-19:00 (Wed from 14:00)
Before you go
- No official tattoo policy is published — ask at reception.
- Payment is usually by ticket machine in cash — bring coins.
- Last entry is 30–60 minutes before closing.
Features
Price
Mood & scenery
Who with
Amenities
✔ Verified operating: 2026-10 Operating status and rates cross-checked against the official site and onsen guides (full source notes in Japanese on the JA page)
Prices and hours change. Check official sources before visiting.
More in this area
Zao Onsen Dai-Rotenburo
A terraced open-air bath along a mountain stream that holds 200 people, with bluish-white strongly acidic sulfur water. Open late April to late November only; closed in winter. Summer starlight sessions at night.
Shirogane-yu (Ginzan communal bath)
A Kengo Kuma-designed communal bath at the entrance to Ginzan's Taishō-era street. Hot water with drifting mineral flakes for ¥500. The one place day visitors can bathe in Ginzan's water — reception closes at 3:30 pm.
Zao Onsen Kamiyu Public Bath
A log-cabin-style communal bath at the top of Takayu-dōri. Zao's three public baths (Kamiyu, Shimoyu, Kawarayu) all cost ¥200, paid into an honesty box. No washing stations — just rinse and sink into the strongly acidic milky sulfur water.
