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Hear the murmuring of the mountain stream and be surrounded by the magnificent atmosphere of ZaoZao Onsen Large Open-air bath

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    Men's bath

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    Women's bath

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    Dressing room (Women's bath)

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    Rest area

The flow of the river and the chirping of wild birds, the unique smell of sulfur in Zao Onsen, the cool air unique to the plateau, the nature that jumps into your eyes…
The Zao Onsen Large Open-air bath, located in the magnificent nature where you can feel the seasons, was completed in 1987 to be the centerpiece of Zao Onsen’s summer.

This large open-air bath uses hot springs that spring from five sources and boasts an overwhelming amount of hot water of 573 liters per minute.
In addition, the springs’ temperatures vary between 40°C to 53°C , which is the optimum temperature for bathing, and it is a hot spring with a very blessed environment.
One of the attractions is its size, which can accommodate 200 men and women at a time.

Feel the four seasons and enjoy the magnificent nature of Zao’s hot water, soothing your mind and body.

Zao Onsen Large Open-air bath

Basic information

Zao Onsen Large Open-air bath
Day-trip hot spring

853-3 Zao Onsen, Yamagata City


[By car] Approximately 20 km and 35 minutes from the Yamagata Zao IC on National Road 13 / Prefectural Road 21 

[By bus] 18 minutes on foot from the Zao Onsen bus station, last stop of the Yamako Bus bound for Zao Onsen from Yamagata Station

If you are using a car navigation system when you come, please enter 023-694-9718 for the telephone number.
* The car navigation system will be displayed as Terrace Sunpal, but the destination will be the parking lot of the large open-air bath.


6:00~19:00 (last entry at 18:30)
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Hours will be shortened for the time being to prevent the spread of COVID-19.

Weekdays: 9:30~17:00 (last entry at 16:30)
Weekends and holidays: 9:30~18:00 (last entry at 17:30)

* As of October 20, 2020
* Please contact the facility directly for details as it is subject to change.

[Business period]
Annual: Mid-April to November 23

* Not open in winter
* Business start dates are subject to change depending on the thaw conditions.
* The closing date may change depending on the snow conditions.


[Onsen information]

Facility name
Zao Onsen Large Open-air bath
Source name
Hanatare source, Otsun source,
Hinako source, Umataki source, Hira source
Water qualities
Acidic sulfur-containing sulfate chloride hot spring (hypotonic acidic high hot spring)
Source temperature
50.8 ℃ (Umataki source)
Bath temperature
41.2 ℃ (Umataki source)
Added water
Overflow & filtration
All hot spring water is (discharged)
No bath salts or disinfectants are used
Cuts, burns, chronic skin diseases, frail children, chronic gynecological diseases, diabetes, hypertension, arteriosclerosis, neuropathy, muscle pain, arthralgia, frozen shoulders, motor paralysis, joint stiffness, bruises, lottery, chronic digestive organs Illness, arthralgia, coldness, recovery period after illness, recovery from fatigue, promotion of health

People with skin and mucosal hypersensitivity, especially those with photosensitivity, elderly skin dryness, acute illness (especially when fever), active tuberculosis, malignant tumors, severe heart disease, respiratory failure, renal failure, Hemorrhagic disorders, severe anemia, and other commonly ongoing disorders, during pregnancy (especially early and late)


Adult: 700 yen (tax included)
Child: 400 yen (tax included)

Surrounding spots

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