ZURICH, SWITZERLAND / RankWire.AI / – In 2026, Switzerland experienced a reduction of 5.5% in the total volume of its glaciers, marking the nation’s second-largest percentage decrease ever recorded for a single year. The retreat followed a winter with minimal snowfall and a summer characterized by multiple heatwaves, contributing to the shrinking ice cover. Glacier Monitoring Switzerland, known as GLAMOS, documented these losses across the Swiss Alps during the 2026 monitoring cycle. The Swiss Academy of Sciences reported that nearly 20% of the country’s glacier volume has vanished over the past five years.
The winter season spanning 2025 to 2026 ranked among Switzerland’s ten least snowy winters since systematic data collection began. From May through September, persistent hot and dry weather exacerbated the exposure of glacier surfaces. The temperature at the freezing level surpassed 4,000 metres on 76 days—more than twice the typical number for the warm season. By September, researchers observed no snow remaining at elevations around 3,500 metres within the monitored areas.
During this monitoring period, glaciers’ average thickness decreased by approximately 2.5 to 4 metres. Certain glacier tongues lost as much as 10 metres of ice. Among the glaciers experiencing the most significant melt were Allalin, Clariden, Great Aletsch, and Rhône, which registered their greatest retreat since measurements commenced. Only 2022 saw a larger percentage loss on Switzerland’s long-term glacier record. This extensive retreat impacted both high-altitude ice and lower sections across the Alps.
Decline of Smaller Glaciers Mirrors Alpine Ice Retreat
During 2026, several smaller glaciers completely disappeared, including Bella Tola in Valais and Griessfirn in Glarus. Their vanishing points to a broader, ongoing pattern of ice loss throughout Switzerland’s Alpine zones. National data indicates that glacier volume has diminished by nearly 20% since 2021. The recent declines followed multiple years of weak snowfall accumulation combined with intense summer melting. Researchers recorded widespread thinning across both large glaciers and smaller ice bodies, emphasizing the persistent decline.
The meltwater released from glaciers between July and September totaled about 2.2 trillion litres, a volume surpassing four times the annual drinking-water needs of Swiss households. This meltwater entered Alpine rivers and water systems during a notably dry summer period. The figures highlight the immense volume of ice that transitioned into Switzerland’s water cycle in just three months, with high temperatures accelerating the seasonal ice loss at many monitored sites.
2026 Melting Extent Distinct From Record Year
Although 2026’s glacier loss was severe, it remained below the record set in 2022, when melting conditions were even more extreme. One notable difference was the snow cover at the onset of summer; many glaciers entered the 2026 melt season with marginally more snow than in 2022. Additionally, less Saharan dust settled on the snow during 2026, as cleaner snow reflects more sunlight, whereas dust-covered surfaces absorb more solar radiation.
Despite these differences, Switzerland still recorded extraordinary glacier retreat across both high elevations and lower tongues in 2026. Field surveys, snow measurements, and mass-balance observations confirmed ongoing changes through the end of September. Results demonstrated widespread ice loss, disappearance of smaller glaciers, and substantial thinning across the country. These findings place 2026 among the most severe years in the Swiss glacier measurement record, adding further decline to a system that has experienced sharp contraction in recent years.