Montenvers and the Mer de Glace

The Montenvers railway has been carrying visitors up the hillside above Chamonix for more than a century, and the ride in a red cogwheel train through the forest is half the pleasure. In about twenty minutes you arrive at a viewpoint over the Mer de Glace, the sea of ice that flows down from the Mont Blanc massif and is the longest glacier in France. From the terrace you look across to the jagged Grandes Jorasses and the Dru. A gondola goes down from the station toward the glacier, and from its foot a stairway leads to an ice cave that is carved afresh each year, a short walk into blue-lit tunnels inside the ice. Up at the station there is also the Glaciorium, a small exhibition about glaciers and climate, a café and a restaurant. It is one of the most rewarding outings in the valley and a good alternative to the Aiguille du Midi when you want views without extreme altitude.

The seasons shape the visit. The train and the Mer de Glace gondola closed at the end of 1 November 2026 and are due to reopen on 5 December 2026, and the ice cave is scheduled to reopen on 17 December 2026. The Glaciorium next to the hotel stayed open after the lifts closed, according to local reports, but you cannot rely on reaching it by train until the line restarts, so check the live status before you plan a November trip.

The cave is rebuilt every year, which is why it opens later than the train.

The glacier is shrinking, and the visit tells that story. The ice surface drops by several metres a year, and the long staircase down to the cave has been extended again and again as the surface falls. Expect to descend a good number of steps to reach the gondola's lower station and to climb back up afterward, which is hard for visitors with limited mobility. Walking shoes with grip are worth bringing, and so are warm layers, because the cave stays cold all year and the viewpoint is windy.

Plan about half a day. The train ride up takes around twenty minutes, then give yourself an hour at the viewpoint and the exhibition and another hour for the gondola and the cave. Go early or late to avoid peak crowds, and consider a guided option if you want to walk on or beside the ice with someone who knows the conditions. Tickets in high season sell by timed slot, and the booking page shows the guided tour that follows the glacier, which suits visitors who want local knowledge rather than a self-guided walk.