Location and surroundings
Grand Colon is situated in France, within the Auvergne-Rhône-Alpes region, the district of Isère, and the municipality of Grenoble. Geographically, it belongs to the Central European Highlands, the Alps, the Western Alps, the Southwestern Alps, the Dauphiné Alps, and specifically the Belledonne range. Within the 214 named peaks of the Belledonne, it holds the 111th position by elevation. The landscape around the mountain features rugged alpine terrain, slopes overlooking regional valleys, and nearby passes.
Neighbouring peaks
The immediate surroundings of Grand Colon include several nearby peaks and mountain passes:
- Le Galeteau (peak), 2,402 m, 0.8 km E
- Dents du Loup (peak), 2,375 m, 1.5 km NE
- Petite Lance du Crozet (peak), 2,355 m, 1.9 km NE
- Col du Loup (mountain pass), 2,380 m, 2.0 km NE
- Pic du Loup (peak), 2,692 m, 2.2 km NE
- Pointe Centrale de Jasse Bralard (peak), 2,525 m, 2.6 km SE
- Grande Lauziere (peak), 2,741 m, 2.6 km E
- Pointe Est de Jasse Bralard (peak), 2,491 m, 2.7 km S
The nearest higher peak is Le Galeteau at 2,402 m, located 0.8 km east of Grand Colon. On and around the summit itself, a viewpoint is situated 10 m SW, another viewpoint 210 m NE, and the Croix Pourroy wayside cross stands 870 m SW.
The view from the summit
From the heights of Grand Colon, several major high peaks within a 25 km radius are visible under clear conditions. The highest peaks within this range include Pic Bayle at 3,465 m, located 16.6 km east; the Cimes de la Barbarate at 3,291 m, situated 17.3 km east; the Sommet Nord de Sarenne at 3,128 m, 17.2 km east; and the Pointe de Malhaubert at 3,049 m, found 22.5 km south. These prominent summits dominate the surrounding alpine horizon across the regional massifs.
The range
Grand Colon forms part of the Belledonne range, which spans the hierarchy of the Southwestern Alps, the Western Alps, the Alps, and the Central European Highlands. The highest peak of the Belledonne is the Sommet de Belledonne, reaching an elevation of 2,977 m and located 5 km east of Grand Colon. Out of 214 named peaks in the Belledonne, Grand Colon ranks as the 111th highest.
Climbing routes
The normal route to Grand Colon starts from Pré Raymond, proceeding via Lac du Crozet and the Col de la Sitre. Hikers also frequently utilize the Refuge de la Pra nearby during their ascents in the area.
Access and starting points
The usual starting town for ascents is Laval. Alternative access points include the village of Revel, located 5.2 km northwest of the top at about 640 m elevation, and the locality of Miribel, 5.4 km south. There is one car park within 2 km of the summit, with the nearest being 1.7 km west. Additional nearby infrastructure mapped around the mountain includes drinking water at 1.1 km west, the Source du Grand Colon spring at 1.2 km west, and Le cul de la vielle spring at 1.3 km northeast. Shelters and huts in the vicinity comprise the Baraque du Colon wilderness hut at 1.1 km west, the Habert de la Pierre du Mercier shelter at 1.2 km north, and another shelter located 1.3 km east.
Climate and weather
Climate estimates derived from NASA POWER data covering 2001 to 2020 indicate that the mean temperature at the summit of Grand Colon reaches its warmest in July at about 8 °C and its coldest in January at about -5 °C. Months with a mean temperature above freezing at the summit include April, May, June, July, August, September, and October. Precipitation in the surrounding area totals about 850 mm annually, with November being the wettest month at about 100 mm and February the driest at about 55 mm. Common mountain weather hazards in this part of the Alps include sudden fog, rapid temperature drops, and afternoon thunderstorms during the warmer months.
Best time to visit
The favorable period for visiting Grand Colon corresponds to the months when temperatures at the summit remain above freezing, namely April, May, June, July, August, September, and October. During these months, conditions are generally most suitable for hiking and ski-touring, particularly during the drier late-winter and summer windows when snow cover stabilizes or recedes from the lower paths.
Nature and wildlife
The landscape surrounding Grand Colon features typical alpine meadows, rocky ridges, and sparse high-altitude vegetation adapted to cold winters and short growing seasons. Wildlife in this sector of the Belledonne range includes chamois, alpine marmots, and various birds of prey such as golden eagles soaring over the upper slopes. The lower valley approaches support mixed forests and mountain flora typical of the Dauphiné Alps.
Guides and organised ascents
For high-altitude terrain and steep alpine routes, engaging a certified mountain guide is advisable for less experienced visitors. In France, professional mountain guides are represented by the French National Mountain Guides Union (Syndicat National des Guides de Montagne (SNGM)), which is a member of the International Federation of Mountain Guides Associations (IFMGA/UIAGM). The national alpine club or federation is the Fédération Française des Clubs Alpins et de Montagne (FFCAM). Established guiding companies operating within the country include the Compagnie des Guides de Chamonix based in Chamonix-Mont-Blanc. Visitors seeking organised ascents can also inquire through local tourist offices in regional settlements. Guided itineraries typically cover instruction, route navigation, and safety management, with prices varying based on the duration, group size, and inclusion of hut nights or technical equipment.
Safety and preparation
Climbing Grand Colon demands proper physical preparation, adequate clothing, sturdy footwear, and navigation tools due to changing weather and rugged mountain terrain. In case of emergency, the designated mountain rescue number across France is 112, which routes callers to the competent rescue service, usually the gendarmerie PGHM or CRS Montagne. Mobile phone and other communication masts mapped within 10 km total 30, with the nearest located 4.5 km southwest.
History and name
Grand Colon has a long-standing reputation as a popular hiking and ski-touring destination within the Belledonne range. Rising prominently above the Grésivaudan valley and the city of Grenoble, it has traditionally served as a primary local objective for alpine enthusiasts and ski mountaineers exploring the region.
Interesting facts
Grand Colon stands as the 111th highest peak out of 214 named summits in the Belledonne range. Its nearest higher neighbor is Le Galeteau at 2,402 m, situated only 0.8 km to the east, while the range high point, the Sommet de Belledonne, lies 5 km away to the east.
FAQ
What is the elevation of Grand Colon? Grand Colon reaches an elevation of 2,394 metres.
Where is Grand Colon located? It is located in France, within the Auvergne-Rhône-Alpes region, Isère district, and Grenoble municipality, forming part of the Belledonne range.
What are the nearest peaks to Grand Colon? The nearest peaks include Le Galeteau (2,402 m, 0.8 km E), Dents du Loup (2,375 m, 1.5 km NE), and Petite Lance du Crozet (2,355 m, 1.9 km NE).
Is there water on the way to Grand Colon? Yes, water sources near the route include drinking water at 1. 2 km west, and Le cul de la vielle spring at 1.3 km northeast.
Are there huts on Grand Colon? Huts and shelters in the area include the Baraque du Colon wilderness hut (1.1 km W), the Habert de la Pierre du Mercier shelter (1.2 km N), and another shelter 1.3 km E, with the Refuge de la Pra also used nearby.
How long does it take to walk up Grand Colon? The ascent from Pré Raymond takes about 3 to 4 hours, while walking from the car park at Parking de la Baraque des Carriers takes roughly 1.5 to 2.5 hours, and from Revel takes about 3.5 to 5 hours.
How is the mobile phone coverage on Grand Colon? There is good mobile phone coverage on most of the summit and upper ridge due to proximity to the Grenoble valley, with 30 communication masts mapped within 10 km. Emergency calls can reach services via 112 over any available network, and visitors should download maps before setting out.