Onogawa Onsen: Hot Spring Guide & Visitor Access

Onogawa Onsen, welling up on the outskirts of Yonezawa City, is an old hot spring with a legend that Ono no Komachi found it in 836 when she fell ill. The tale is handed down that Komachi, on her way from Kyoto to the Tohoku region to visit her father, discovered the water in the place where she fell ill. With its abundant flow and its water rich in metasilicic acid that leaves the skin moist after bathing, it has been cherished as a beauty spring of the Okitama region and also called the inner retreat of Yonezawa.

Highlights

The hot spring town has the public bathhouses Ama-yu and Taki-yu, and together with foot baths and a drinking-spring spot, you can enjoy strolling around in geta. Ama-yu sits at the center of the town and is favored as a base for the bath rounds. Agriculture using geothermal spring heat is also practiced, growing the specialty urui and other produce. Vegetables grown in greenhouses with the heat of the spring have a flavor unique to this land. In recent years, power generation using the steam of the spring has also been carried out. It is a hot spring town where you can feel the blessings of the spring, its abundant flow put to use in many directions.

Seasonal Highlights

In early summer, Genji and Heike fireflies dance over the river near the town, spreading a fantastical scene. From June into July it grows lively with the firefly festival, with Genji fireflies seen in the first half of the period and Heike fireflies in the latter half. In winter it gains the charm of a snow-viewing bath.

Access and Basic Information

From JR Yonezawa Station it is about 30 minutes by Sanko bus, with Nishi-Yonezawa the nearest station. The water is a sulfur-containing sodium and calcium chloride spring, rich in metasilicic acid and high in moisture retention. The temperature varies by source but is a high-temperature spring, and the water is managed by combining hotter and cooler sources. The public baths can be entered for around a few hundred yen.

Practical Travel Notes

The fireflies are usually at their best from mid-June to early July, but this shifts from year to year, so it is reassuring to check the timing with the tourism association before visiting. To make the rounds of the public baths, two foot baths, and the drinking-spring spot, allow about half a day to go around at a relaxed pace. If you combine it with evening firefly viewing, an overnight stay is recommended, and you can also enjoy central Yonezawa and historic sites connected to the Uesugi clan. The flavors of Yonezawa, including Yonezawa beef, are another pleasure of this hot spring town. A day trip budget of a few thousand yen is a guide.

A Word of Advice

The fireflies are best at times that shift from year to year, so it is reassuring to check the timing with the tourism association before visiting. Firefly viewing is after dark, so bring a light to guide your footing and something to throw over your shoulders. It is good manners to watch fireflies gently, taking care not to shine strong light on them or catch them.