Surveyors measure Mont Blanc 1.29 meters lower than last year
The summit's height rises and falls with its snow and ice cap, and experts say the yearly change should not be read as a direct measure of Alpine glacier loss.
The summit of Mont Blanc, western Europe's highest mountain, now stands 4,807.47 meters above sea level, 1.29 meters lower than in 2025, a team of French surveyors said Wednesday.
The mountain's rock peak sits at about 4,792 meters, but its measured height shifts every year as heat, wind and snowfall change the thickness of the snow and ice cap on top. The summit has dropped 3.43 meters since a high of 4,810.90 meters in 2007, though this year's figure was 1.88 meters above the low recorded in 2023.
Surveyors from France's National Union of Expert Surveyors (UNGE) and the Order of Expert Surveyors, who have monitored the peak since 2001, used satellite positioning and drones to model the summit cap during an expedition last month.
The experts cautioned against linking the yearly swings to the rapid loss of Alpine ice. "An increase in summit altitude does not necessarily mean that the mountain has gained ice mass, nor does it contradict the documented retreat of Alpine glaciers," a UNGE spokesperson said.
Expedition leader Jean des Garets, president of the Haute-Savoie chamber of surveyors, said warming was visible across the rest of the massif but did not yet seem to have the same impact above 4,000 meters. On the climb, he told French broadcaster TF1, the Tête-Rousse glacier "has literally melted before our very eyes and now in some places we're crossing a stream instead of a glacier."
This brief is based on an article published Oct. 14, 2026, by Ajit Niranjan in The Guardian. Read the original: https://www.theguardian.com/environment/2026/oct/14/mont-blanc-loses-metre-height
This article was produced with the assistance of AI tools and reviewed by an editor before publication.
