Location and surroundings
Mont Granier belongs to the Chartreuse Mountains, within the Savoy Prealps of the Western Alps. It is in France, in Auvergne-Rhône-Alpes, and the administrative area given for it is the municipality of Grenoble in Isère. In the Chartreuse it ranks as the 9th highest of 108 named peaks, so it is high but not the range high point.
The mountain sits on the edge of the limestone mass of Chartreuse, above valleys, passes and villages. Its north side is a steep cliff, while the surrounding slopes connect toward the Col du Granier and the Entremont area. The terrain is typical of the Prealps: forested lower slopes, broken rock higher up, and karst features around the summit.
Neighbouring peaks
- L'Alpette — 1,640 m, 1.3 km SE
- Col du Granier — 1,134 m, 1.9 km NW
- Granier, Sommet Sud — 1,934 m, 1.9 km S
- Col du Frêne — 1,007 m, 2.0 km W
- Mont de Joigny — 1,559 m, 3.7 km NW
- Sommet du Pinet — 1,867 m, 4.0 km SW
- Col du Mollard — 1,320 m, 5.0 km NW
- Mont Pellaz — 1,450 m, 5.0 km NW
Among these, Granier, Sommet Sud is the nearest higher peak, only slightly above Mont Granier and just to the south. The passes around it show how the mountain sits between the Entremont side and the Chambéry side, with the summit rising well above the surrounding cols.
The view from the summit
Within 25 km, the highest peak listed is Pic du Frêne at 2,807 m, about 24.7 km to the southeast. It is the main high mountain in that wider view, far above the Chartreuse summits around Mont Granier. From the top, the eye also takes in the lower ridges and passes of the Savoy Prealps, with the steep relief of the surrounding valleys shaping the panorama.
The summit area is exposed enough that the outlook is broad on clear days, especially toward the valleys and the higher Alpine country beyond. The contrast between the local limestone ridge and the more distant high peaks is one of the defining features of the view.
The range
Mont Granier belongs to the Chartreuse Mountains, where the highest peak is Chamechaude at 2,082 m, about 22 km to the southwest. The range has 108 named peaks, and Mont Granier ranks 9th highest among them. That places it among the important summits of the range, though below the main high point.
The Chartreuse is part of the wider Alpine system in southeastern France. Mont Granier sits on its northeastern edge, where the limestone relief drops toward the valleys and passes that separate the massif from the surrounding lowlands.
Climbing routes
The usual ascent is the marked route called Le sommet du Mont Granier. The classic approach is from the Col du Granier or the Saint-André area, and it is a steep climb with sections where the ground can feel exposed or unstable near the cliff edge. Another approach from the Chartreuse side uses the Pas des Barres or Pas de la Porte area, depending on conditions and route choice.
There is no summit hut on the top itself. In this terrain, route choice matters, especially after wet weather or when loose limestone and cliff-edge exposure make progress slower than the map suggests.
Access and starting points
The usual starting town is Chapareillan, and the mountain is also close to Entremont-le-Vieux, Barraux and the Col du Granier. From the car park 1.9 km northwest of the summit, at about 1,130 m, the walk is roughly 2.4 km with 800 m of ascent, or about 1.5–2 hours. From Entremont-le-Vieux, the estimate is about 4.6 km and 1,090 m of ascent, or roughly 2–3.5 hours.
OpenStreetMap features near the summit include Intersection la Coche - Tencovaz bus stop, 1.8 km west; Col du Granier bus stop, 1.9 km northwest; four car parks within 2 km; and a marked hiking route over the summit. The nearest settlements are Entremont-le-Vieux 3.5 km southwest, Chapareillan 5.1 km east, and Barraux 5.3 km southeast.
Climate and weather
These are estimates from NASA POWER climate data. At the summit, the mean temperature is about 11 °C in July, the warmest month, and about -3 °C in January, the coldest. Mean temperatures are above freezing from April to October. Around the mountain, annual precipitation is about 950 mm, with the wettest month in May at about 95 mm and the driest in February at about 60 mm.
Weather hazards here are typical of a mid-altitude Alpine limestone mountain: rapid changes, wet rock, fog on the ridges, and snow or ice outside the main summer season. After rain, the cliffy ground and karst terrain can become slippery and more difficult to follow.
Best time to visit
The most suitable months are usually the period when the summit is above freezing, especially April to October, with the most comfortable conditions often in late spring, summer and early autumn. May can be wetter, while winter and early spring bring colder ground, lingering snow and more difficult footing on the upper slopes.
For a day hike, the best window is generally when the paths are dry and visibility is good. On a mountain with steep limestone and exposed sections, stable weather matters as much as temperature.
Nature and wildlife
Mont Granier lies in limestone country with cliffs, scree, forested lower slopes and karst features such as caves and sinkholes. Around this elevation in the Chartreuse, you can expect mixed mountain woodland below, then more open rock, grass and scrub higher up. The summit area includes the Réserve naturelle des Hauts de Chartreuse and the Chartreuse Regional Nature Park.
Typical wildlife in this part of the Alps includes chamois, roe deer, foxes, birds of prey and many alpine and subalpine birds. The protected status helps preserve the mountain’s habitats, but the terrain remains rugged and sensitive to erosion.
Guides and organised ascents
For a steep limestone mountain with exposed sections, a certified guide can be useful if you are unsure of route-finding, weather, or your comfort on loose ground. In France, mountain guides are represented by the French National Mountain Guides Union (Syndicat National des Guides de Montagne, an IFMGA/UIAGM member). The national alpine club and federation is the Fédération Française des Clubs Alpins et de Montagne (FFCAM). A well-known guiding company in the country is the Compagnie des Guides de Chamonix.
Organised ascents usually include route choice, pacing, safety decisions and, when needed, technical advice for exposed ground. The cost depends on the number of days, group size, hut nights and equipment, but no fixed price applies here. For local planning, tourist offices in nearby villages such as Chapareillan and Entremont-le-Vieux are sensible starting points.
Safety and preparation
Mont Granier demands sure footing, attention to route markers and respect for steep limestone terrain. The upper mountain can be exposed, and after rain or in shoulder seasons the ground may be slippery or unstable. Good boots, weather protection and enough water are important, and hikers should be ready to turn back if visibility drops or the rock feels unsafe.
For mountain rescue in France, call 112. In the mountains this is routed to the competent rescue service, usually the gendarmerie PGHM or CRS Montagne.
History and name
Mont Granier is closely tied to the night of 24 to 25 November 1248, when a huge collapse removed part of the mountain’s north face. The event buried villages, killed many people and left the dramatic cliff that defines the mountain today. It is regarded as one of the largest historical landslides in the Alps and one of the biggest known in Europe.
The name Granier comes from an older place name linked to the word for a granary or barn. The mountain was once called Mont Apremont, and after the disaster it took the name of one of the destroyed villages. The nearby village of Apremont later adopted the older mountain name.
Interesting facts
Mont Granier is the 9th highest of the 108 named peaks in the Chartreuse Mountains, and its nearest higher neighbour is Granier, Sommet Sud, only 1.9 km to the south. The range high point, Chamechaude, is 22 km away to the southwest. The mountain also marks a border-like position between the Entremont side and the valleys toward Chambéry and the Grésivaudan.
Its north face is the result of the 1248 collapse, which created one of the largest limestone cliffs in France. That history makes Mont Granier both a hiking objective and a landmark in Alpine landscape history.
FAQ
How high is Mont Granier? It rises to 1,933 m.
Where is Mont Granier? It is in France, in Auvergne-Rhône-Alpes, in Isère, on the edge of the Chartreuse Mountains.
What range does it belong to? It is part of the Chartreuse Mountains, within the Savoy Prealps of the Western Alps.
What are the nearest peaks and passes? The closest listed neighbours are L'Alpette, Col du Granier, Granier, Sommet Sud, Col du Frêne, Mont de Joigny, Sommet du Pinet, Col du Mollard and Mont Pellaz.
Is there water on the way to Mont Granier? Springs are mapped near the summit area, including Fontaine Neuve 1.4 km south, Source captée de Rochereau 1.7 km southeast and Source des Charbonniers 1.8 km north. Even so, carry enough for a day hike, usually 1.5–3 litres depending on heat and route length.
Are there huts on Mont Granier? A shelter is mapped 1.9 km northwest of the summit.
How long does it take to climb Mont Granier? From the car park 1.9 km northwest of the top, the rough walking time is about 1.5–2 hours. From Entremont-le-Vieux, it is about 2–3.5 hours. These are estimates from distance and height gain, and the real path may take longer.
Is mobile coverage likely? There are 32 communication masts mapped within 10 km, with the nearest about 2.0 km northwest. On an open summit a signal is likely, but it can fail in valleys or behind ridges. Download maps before you go, and remember that 112 reaches emergency services over any available network.