International Mountain Day
Mountains sustain life for half the world — let's protect them.
About
International Mountain Day on December 11 raises awareness of the importance of mountains to life on Earth. Mountains cover 27% of the Earth's land surface, provide freshwater to more than half the world's population, and are home to some of the planet's most spectacular biodiversity. Yet mountains are among the ecosystems most vulnerable to climate change — glaciers are retreating, snowlines are shifting, and mountain communities face flooding, landslides, and drought.
History
The United Nations designated 2002 as the International Year of Mountains and proclaimed December 11 as International Mountain Day starting in 2003. The day builds on a global movement for mountain conservation, sustainable mountain tourism, and the rights of mountain communities. Each year a new theme focuses on a specific mountain-related challenge.
Where It's Observed
Cultural Context
US United States
The US's iconic mountain ranges — Rockies, Sierra Nevada, Appalachians, Cascades — are celebrated on International Mountain Day. National parks advocacy, climate impacts on Western snowpack, and Indigenous land rights in mountain regions are key themes.
KR South Korea
South Korea's mountainous terrain (about 70% of the country) and deep hiking culture make International Mountain Day particularly meaningful. Seoraksan, Jirisan, and Hallasan draw millions of hikers annually, and mountain conservation is a popular cause among Korean outdoor enthusiasts.
JP Japan
Japan's mountainous landscape is central to its national identity — from Mount Fuji to the Japanese Alps to sacred mountain pilgrimage routes (Kumano Kodo). International Mountain Day celebrates this heritage and highlights the impacts of climate change on Japan's alpine environments.
How to Participate
- 01Plan a hike or mountain visit to appreciate mountain landscapes firsthand
- 02Support mountain conservation organisations or national parks
- 03Learn about the communities living in mountain regions and the challenges they face
- 04Donate to organisations supporting climate adaptation for mountain communities
Frequently asked questions
When is International Mountain Day?+
International Mountain Day is observed annually on December 11. The date is fixed each year — December 11 — and does not shift based on the lunar calendar or weekday.
What is International Mountain Day?+
International Mountain Day on December 11 raises awareness of the importance of mountains to life on Earth. Mountains cover 27% of the Earth's land surface, provide freshwater to more than half the world's population, and are home to some of the planet's most spectacular biodiversity. Yet mountains …
Is International Mountain Day a public holiday?+
International Mountain Day is an international observance or awareness day, not a public holiday in most countries. It does not typically result in days off work or school closures, though some countries and organisations hold official events.
How can I participate in International Mountain Day?+
Plan a hike or mountain visit to appreciate mountain landscapes firsthand Support mountain conservation organisations or national parks Learn about the communities living in mountain regions and the challenges they face These are some of the most accessible ways to engage with the day's purpose.
Which countries observe International Mountain Day?+
Global — United Nations initiative.
Mark the date
Download a free printable calendar for 2026 and never miss International Mountain Day.