Mountain Day is a public holiday in Japan, known locally as 山の日.
In 2026 it falls on Tuesday 11 August; in 2027 on Wednesday 11 August.
The date is fixed, so only the weekday changes from year to year.
Dates, 2025 to 2028
| Year | Date | Weekday | Note |
|---|---|---|---|
| 2025 | 11 August | Monday long weekend | |
| 2026 | 11 August | Tuesday | |
| 2027 | 11 August | Wednesday | |
| 2028 | 11 August | Friday long weekend |