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International Mountain Day - December 11, the UN day raising awareness of mountain ecosystems

International Mountain Day on December 11 is a UN-recognised day established by UN General Assembly Resolution 57/245 in 2002. First observed in 2003. Raises awareness of the importance of mountain ecosystems, the role of mountains in sustainable development, and the challenges faced by mountain dwellers.

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International observancePublished 14 de octubre de 2026

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Última revisión: 14 de octubre de 2026
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International Mountain Day on December 11 is a UN-recognised day established by UN General Assembly Resolution 57/245 in 2002. First observed in 2003. Raises awareness of mountain ecosystems, sustainable mountain development, and challenges faced by mountain dwellers. Coordinated by the FAO. Observed globally. Not a public holiday.

The one-line summary

UN-recognised day established 2002 by UNGA Resolution 57/245. First observed 2003. Coordinated by the FAO and the Mountain Partnership. Celebrates mountain ecosystems and 13% of world population. Not a public holiday.

Origin and history

International Mountain Day was established by UN General Assembly Resolution 57/245 in 2002, after 2002 was designated as the International Year of Mountains. The International Year of Mountains was proposed by the Government of Switzerland, supported by 114 countries, and culminated in the Bishkek Global Mountain Summit in October 2002. The summit produced the Bishkek Mountain Platform, which remains the principal policy framework for mountain development.

The first International Mountain Day was observed on December 11, 2003, with the theme "Mountains: The Water Towers of the World." The day is coordinated by the FAO and the Mountain Partnership, a voluntary multi-stakeholder network launched at the World Summit on Sustainable Development in Johannesburg in 2002. The Mountain Partnership now includes 60+ countries, 100+ intergovernmental organizations, and 200+ civil society and private-sector members.

22%Of Earth's land surface covered by mountains
13%Of world population living in mountain regions
60-80%Of world's freshwater from mountain sources

How it is observed

International Mountain Day is observed through environmental campaigns, mountain-cleanup events, and policy forums at the UN and regional levels. National alpine clubs, mountaineering organizations, and conservation groups host public events; the FAO and the Mountain Partnership coordinate policy discussions. Mountain tourism boards often run special promotions tied to the day.

Major recurring events include the Mountain Partnership annual policy forum, regional alpine conferences (held in Switzerland, Austria, Italy, France, and Germany), and the annual climate-change-mountain symposium at the University of Zurich. The day sees the publication of new FAO reports on mountain ecosystems, biodiversity, and water resources.

Mountains and climate

Mountain ecosystems are uniquely vulnerable to climate change. The FAO reports that mountain glaciers are retreating at unprecedented rates - the Himalayas have lost approximately 65% of their glacial area since the 1950s. Mountain snowpack is decreasing in the Rockies, Alps, and Andes, with major implications for downstream water supplies. Alpine species are shifting upward in elevation at rates of 10-30 meters per decade.

Climate change impacts on mountains cascade to billions of people downstream. The Indus, Ganges, Brahmaputra, Mekong, Yangtze, Yellow, Rhine, Rhone, Danube, and Colorado river systems all originate in mountain regions and depend on snowmelt and glacial melt for seasonal flow. Reduced mountain water supplies affect agriculture, drinking water, and hydropower in heavily populated downstream regions.

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Switzerland
Switzerland proposed the International Year of Mountains (2002). Bern hosts the Mountain Partnership secretariat. Swiss alpine regions host annual mountain-day events.
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Nepal
Nepal hosts 8 of the world's 14 highest peaks (including Everest). Mountain tourism accounts for ~8% of Nepal's GDP. The Khumbu region observes the day with cleanup events.
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India
India's mountain states (Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh, Jammu and Kashmir, Ladakh) observe the day with environmental campaigns. The Himalayas are a major water source.
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China
China's mountain regions cover 43% of its land area. The Qinghai-Tibet Plateau is the source of major Asian rivers. China has established 6 of the world's 10 largest nature reserves in mountain regions.
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Peru
Peru's Andes host the largest mountain city (Lima at sea level is not mountain; La Paz, Bolivia and Quito, Ecuador are major Andean cities). Peruvian mountain regions host major biodiversity.
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United States
The US mountain regions (Rockies, Sierra Nevada, Cascades) host major ski tourism. National parks in mountain regions observe the day with public events.

Controversies and criticism

International Mountain Day faces two notable critiques. First, mountain communities often face challenges (climate change, extractive industries, tourism pressure) that require long-term policy solutions, not single-day awareness events. Second, the day's themes have sometimes focused narrowly on environmental issues while under-emphasizing the socioeconomic challenges of mountain communities, including poverty, limited healthcare, and brain drain.

The Mountain Partnership has worked to address both critiques. Recent themes have included "Mountain Women" (2022) and "Mountain Restoration" (2023), reflecting a more holistic approach to mountain development. The Partnership's policy work has also shifted toward supporting mountain-specific Sustainable Development Goal indicators.

In other countriesMountain regions worldwide observe the day. The FAO and the Mountain Partnership coordinate global events; national alpine clubs and conservation organizations host regional events. Mountain tourism boards often run special promotions tied to the day.

Related observances

International Day of Forests (Mar 21), World Water Day (Mar 22), World Wildlife Day (Mar 3), and World Environment Day (Jun 5) are all related environmental observances. International Mountain Day is the only one specifically focused on mountain ecosystems.

Sources

UNGA Resolution 57/2452002Bishkek Mountain Platform2002FAO Mountain Partnership2002UN Environment Programme2023

Preguntas frecuentes

When is International Mountain Day 2026?

Friday, December 11, 2026. International Mountain Day is observed every year on December 11, regardless of the day of the week. The 2026 observance falls on a Friday.

Who established International Mountain Day?

International Mountain Day was established by UN General Assembly Resolution 57/245 in 2002, following the designation of 2002 as the International Year of Mountains. The Food and Agriculture Organization (FAO) of the UN coordinates the day. The Mountain Partnership, launched in 2002 at the World Summit on Sustainable Development in Johannesburg, is the multi-stakeholder body that supports the day.

Why December 11?

December 11 was chosen to coincide with the anniversary of the 1992 Rio Earth Summit chapter on upland and lowland interactions, which established mountains as a focus of UN sustainable development work. The date also falls during the ski-tourism season in the Northern Hemisphere, helping to amplify the day's tourism and recreation messaging.

Why are mountains important?

Mountains cover approximately 22% of the Earth's land surface and are home to about 13% of the world's population. Mountains provide 60-80% of the world's freshwater resources through snowmelt and mountain aquifers, host half of the world's biodiversity hotspots, and are popular destinations for tourism (mountain tourism accounts for 15-20% of global tourism).

Is International Mountain Day a public holiday?

No. International Mountain Day is a UN-recognised international day, not a public holiday in any country. Government offices, banks, schools, and most businesses operate normally on December 11. The day is marked by environmental campaigns, mountain-cleanup events, and policy forums at the UN and regional levels.

What is the theme of International Mountain Day 2026?

The FAO announces a new theme each year. Recent themes include "Mountain Restoration" (2023), "Women in Mountains" (2022), and "Mountain Biodiversity" (2021). The 2024 theme was "Mountains and Sustainable Mountain Development". The 2025 theme was "Climate Change Solutions from the Mountains". The 2026 theme typically focuses on a specific aspect of mountain ecosystems or communities.

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