Swiss glaciers lose a fifth of their ice in five years

To stand at the edge of a Swiss glacier today is to witness a landscape in fast-forward. In 2026 alone, the country's glaciers shed more than 5% of their remaining ice volume, according to the latest annual report from the Swiss Academy of Sciences. While that single-year figure did not quite surpass the record devastation of 2022, it still saw the ice thin by an average of 2.5 to 4 metres. In the lower reaches of some glaciers, the loss reached a staggering 10 metres.

The bigger picture is even more sobering. Over the past five years, Switzerland has lost nearly 20% of its total glacier ice volume. To put that into perspective, an asset that took millennia to accumulate has effectively crumbled in the time it takes to complete a university degree. Several of the country's most celebrated glaciers, including the Rhône, Aletsch and Clariden, experienced their worst melting on record this year. Smaller ice bodies fared even worse: Bella Tola in Valais and Griessfirn in Glarus melted away completely and are now considered permanently gone.

These findings are not speculative projections but the fruit of painstaking, long-term observation by the Glacier Monitoring Network, known as GLAMOS, which is based at ETH Zurich and the universities of Fribourg and Zurich. The data paints a picture of a system under siege from multiple angles at once.

A winter that failed to protect the ice

The root of the crisis lies in a one-two punch of unusually dry weather and persistent heat. The winter of 2025 to 2026 ranked among the ten least snowy since Swiss records began, depriving the glaciers of the thick insulating blanket they need to withstand the summer sun. When the warmer months arrived, conditions turned from bad to worse. Between May and September, the freezing level climbed above 4,000 metres on 76 days, more than double the historical average and a new Swiss record. By September, even at 3,500 metres, the snow had vanished, leaving bare ice exposed to temperatures it was never meant to endure.

This relentless melting did bring one short-term benefit: it temporarily eased water shortages during the summer. Between July and September, Swiss glaciers released roughly 2.2 trillion litres of water, an amount exceeding four times the annual drinking water consumption of all Swiss households. For a country that relies heavily on hydropower and alpine water reserves, this might sound like a silver lining. However, experts caution that this is a resource being spent down rather than renewed. As the glaciers continue to shrink, the meltwater they provide will inevitably decline, leaving a gap that seasonal rainfall may not be able to fill.

What makes the Swiss case resonate far beyond its borders is that it serves as a particularly sensitive barometer for the entire Alpine region, and indeed for Europe. Glaciers respond to climate shifts with a kind of brutal honesty; they do not debate or delay. The fact that the rate of loss has accelerated so sharply in a mere half-decade suggests that the underlying drivers are not merely persisting but intensifying. For a continent that has long viewed its mountains as a symbol of permanence, the message written in the ice is becoming impossible to ignore.