June 26th of every year is designated “open-air spa day”, on which certain of the abundant open-air baths within the Okuhida-Onsengo are made open to free use. This famous event is one reason why Okuhida-Onsengo is renowned as the “Kingdom of Open-air spa”. By visiting the various specified open-air baths and collecting stamps at each, you can receive an original souvenir present (One day only) .








Specified open-air baths(2019)2021 undecided

  • Hirayu-Onsen “Hirayu-no-yu” (in “Hirayu Minzoku-kan”)  / 6:00 – 21:00
  • Fukuji-Onsen “Isurugi-no-yu” (in “Mukashibanashi-no-sato”)  / 8:00 – 16:00
  • “Kojin-no-Yu” at Tochio-Onsen / 8:00 – 22:00
  • “Shinhotaka-no-Yu” at Shinhotka-Onsen / 8:00 – 18:00
  • “Higaku-no-Yu” at Shinhotka-Onsen / 10:00 – 19:00

* At all of these facilities, reception closes 1 hour before the facility’s closing time. * Kami-no-yu is currently closed due to construction on the slope of the opposite bank.

Key points of participation

  • Only on June 26th only, specified open-air baths are open to use free of charge.
  • If participating in the stamp rally, please take a stamp booklet with you as you visit and enjoy each of the open-air baths.Ask one of the staff at the bathhouse to stamp your booklet after your bath.At unmanned open-air baths, use the commemorative stamp set up at the location after you have used the bath.
  • Stamp booklets are available at the open-air baths specified above and at prize exchange locations(1 per person).
  • Collect stamps from all of the 5 specified open-air baths and receive a souvenir present.

Prize exchange locations

  • Okuhida-Onsengo Tourism Association (Shin-Hirayu-Onsen)
  • Hirayu Onsen Tourist Information Center
  • Higaku-no-yu (Shin-Hotaka-Onsen)

Prize exchange period

From 26th to 27th June | 10:00~17:00


Map of participating open-air baths and souvenir prize exchange locations


  • The content of the event may be changed.