ObservanceFriday, December 11, 2026
International Mountain Day
- Date
- Recurs
- Every year on December 11
- Category
- Nature
International Mountain Day is a nature-focused observance on December 11, celebrated across the United States to draw attention to the plant, animal, or landscape at its center.
Add to your calendarA calendar file for Apple Calendar, Google Calendar or Outlook. The event repeats every year. You can also subscribe to this observance or to the whole calendar.
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