Opening dates : Summer 2025 - 24 may to 2 november

The Mer de Glace : a giant

Located on the northern slope of the Mont-Blanc massif, the Mer de Glace is the largest glacier in France. 
Almost 7 kilometres long and covering an area of about 40 km², it extends from an altitude of 3,900 metres to about 1,500 metres. Its thickness, once impressive, still reaches several hundred meters in places.

The Mer de Glace is a glacier in perpetual motion. Fed by the eternal snows of the surrounding peaks, it advances slowly, at an average speed of 70 meters per year at its center. However, like many Alpine glaciers, it is now suffering the effects of global warming, leading to a significant decline in its mass and extent.

Other activities

The Panoramic

A moment suspended in front of the Mer de Glace The restaurant Le Panoramique offers a unique experience in the heart of the mountains, with its vast panoramic terrace and...

The Temple of Nature

In 1779, Lord Blair, an English gentleman, finds himself caught in a storm in the Montenvers. The shelter under the stone was so uncomfortable that he had a hut built...

The shop

Don’t forget to visit the Montenvers shop before returning to the valley, where you can buy a souvenir of your excursion to this unique site!

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Opening dates : Summer 2025 - 24 may to 2 november

Les petits prix du mercredi

Durant 4 mercredis – 17 et 24 septembre et 8 et 15 octobre – profitez de -30%* sur votre billet aller-retour train pour le train du Montenvers.

Une occasion unique de vivre une expérience inoubliable tout au long du spectaculaire trajet et face à la majestueuse Mer de Glace et aux sommets mythiques des Alpes.


Opening hours

From 15/09/2025 to 02/11/2025
Open every day from 8.30 to 4.30 pm

 
 

Last ascent

 4.00 pm

Last descent

4.30 pm

Last departure from Chamonix
to visit the ice cave

2.30 pm

A train every hour or every 30 – or 20 – minutes depending on demand.
Departure 9.00 am optional – depending on numbers

Closure of the ice cave from September 29.
Gondola lift closed from 29/09 to 18/10.