Switzerland’s glaciers lost another 5.5% of their ice volume in 2026, according to the Swiss Glacier Monitoring Network (GLAMOS). Nearly one-fifth of the country’s glacier ice has disappeared since 2021. The retreat is transforming Alpine landscapes and raising concerns about future water supplies, energy production, and mountain safety.
Swiss Glaciers Record Another Major Ice Loss
Switzerland’s glaciers experienced their second-largest annual ice loss on record in 2026, surpassed only by 2022. New figures from GLAMOS and the Swiss Academy of Sciences confirm a 5.5% reduction in glacier volume. Across five years, Switzerland has lost nearly 20% of its glacier ice.
Some glaciers lost between 2.5 and 4 metres of thickness during 2026. Certain glacier tongues experienced losses reaching 10 metres. The latest measurements show that glacier retreat affects both smaller ice bodies and the country’s largest Alpine glaciers.
Why Are Switzerland’s Glaciers Melting So Quickly?
Unusually low snowfall during winter 2025–2026 left glaciers with limited protection against summer temperatures. The following months brought prolonged heatwaves and dry weather across Switzerland. Between May and September, the freezing level rose above 4,000 metres on 76 days, more than twice the usual frequency.
By September, even elevations reaching 3,500 metres had lost their seasonal snow cover. Without protective snow, darker glacier ice absorbs more solar energy and melts faster. Saharan dust can also increase solar absorption, although deposition was lower in 2026 than during the record-breaking 2022 season.
Switzerland’s Most Famous Glaciers Are Changing
The Great Aletsch Glacier, the largest glacier in the Alps, experienced exceptional melting during 2026. The Rhône Glacier, which feeds the Rhône River, also recorded some of its greatest ice losses. Researchers observed similarly severe changes at the Clariden and Allalin glaciers.
Meanwhile, smaller glaciers are disappearing completely. The Bella Tola Glacier in Valais and Griessfirn in Glarus are among those that vanished. Their disappearance illustrates how quickly smaller ice bodies respond to sustained warming.
What Glacier Retreat Means for Europe’s Water
Glaciers naturally store frozen freshwater and release it during warmer months. Between July and September 2026, Swiss glaciers released approximately 2.2 trillion litres of meltwater. According to GLAMOS, this exceeded four times the annual drinking-water consumption of Swiss households.
Additional meltwater can temporarily support rivers during dry summers. However, this contribution will diminish as glaciers become smaller. Reduced summer flows could increasingly affect agriculture, freshwater ecosystems, and hydropower management. The Rhône and Rhine river systems connect Alpine water resources with communities and economic activities beyond Switzerland.
Rising Risks in the Swiss Alps
Retreating glaciers expose steep rock faces, unstable sediments, and previously ice-covered terrain. Combined with thawing permafrost, these changes can contribute to rockfalls and slope instability. New glacial lakes may also develop behind natural barriers of rock and debris.
Some lakes can create flood hazards if their barriers fail. These developments present challenges for mountain communities, infrastructure, tourism operators, and alpine rescue services. Monitoring glacier retreat and surrounding terrain remains essential for managing local risks.
What Will Remain of Switzerland’s Glaciers by 2100?
Future glacier survival depends strongly on global greenhouse gas emissions. ETH Zurich research indicates that Switzerland could lose almost all its glaciers by 2100 without substantial emissions reductions. However, limiting global warming to between 1.5°C and 2°C could preserve approximately one-quarter of the country’s glacier ice.
Smaller glaciers remain especially vulnerable because their limited ice reserves offer little protection against sustained warming. Scientific monitoring cannot reverse glacier loss. It can, however, help communities understand environmental changes and prepare for their consequences.
Switzerland’s glaciers provide a measurable record of climate change, with implications extending far beyond the Alps.
Did You Know?
The United Nations designated 21 March as the International Day of Glaciers’ Preservation. The first observance took place in 2025, alongside the International Year of Glaciers’ Preservation, coordinated by UNESCO and the World Meteorological Organization.
FAQ
A glacier is a moving mass of ice formed from accumulated snow. An ice sheet covers a vast land area exceeding 50,000 square kilometres.
Albedo measures how much sunlight a surface reflects. Fresh snow reflects more sunlight than exposed glacier ice, helping slow melting.
There is no fixed annual number. A 2025 ETH Zurich study projects that annual disappearances could reach 2,000 to 4,000 globally around mid-century, depending on warming.
Some glacier ice could survive if global warming is limited. However, significant losses remain unavoidable because glaciers respond slowly to earlier warming.
Scientific Sources & References
GLAMOS – Swiss Glacier Monitoring Network (2026)
Annual Mass Balance on Swiss Glaciers in 2026.
https://glamos.ch/en/publications
ETH Zurich (2026)
Devastating Year for Switzerland’s Glaciers.
https://ethz.ch/en/news-and-events/eth-news/news/2026/10/devastating-year-for-switzerlands-glaciers.html
University of Zurich / SCNAT (2026)
Swiss Glaciers Lose a Further Five Per Cent of Their Volume.
https://www.geo.uzh.ch/en/news/2026/glamos-2026.html
ETH Zurich (2025)
Switzerland’s Glaciers Could Vanish Completely by 2100.
https://ethz.ch/en/news-and-events/eth-news/news/2025/03/switzerlands-glacier-could-vanish-completely-by-2100.html
World Glacier Monitoring Service (WGMS)
Global Glacier Monitoring and Scientific Data.
https://wgms.ch/
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Credit photo Hero: ©Rémih / Wikimedia Commons