HomeWikiMountain Day Holiday overview Mountain Day Mountain Day is observed in Japan. Ownership: Country-specific holidayCountry: Japan Categories: National Public Holidays Tags: National Memorial Usually a public holiday Date rule: August 11 every year Date type: Fixed date Where and when this holiday appears 202520262027DateWeekdayCountriesAugust 11, 2025MondayJapanDateWeekdayCountriesAugust 11, 2026TuesdayJapanDateWeekdayCountriesAugust 11, 2027WednesdayJapan
