Mont Blanc, known as the ‘roof of Europe’, has lost more than a metre in height over the past year, according to recent data from a team of surveyors in the Haute-Savoie region. The peak now stands at 4,807.47 metres above sea level, which is 1.29 metres lower than its height in 2025.
Fluctuating Heights
The mountain's rock is approximately 4,792 metres tall, but its summit height fluctuates due to changes in the Alpine climate, including heat, wind, and precipitation that affect the thickness of snow and ice. The latest measurements taken during an expedition last month show an increase of 1.88 metres compared to 2023, which recorded the lowest levels in recent memory.
Monitoring Techniques
Chartered surveyors from the Union Nationale des Géomètres-Experts (UNGE) and the Ordre des Géomètres-Experts have been monitoring Mont Blanc since 2001. They utilized precise satellite technology and drones to create a detailed model of the snow and ice cap. The data indicates that the summit has shrunk by 3.43 metres since reaching a high of 4,810.90 metres in 2007.
