Location and surroundings
Bosse Coolidge is located in France, inside the Provence-Alpes-Côte d'Azur region and the municipality of Briançon within Hautes-Alpes. The peak is part of the Central European Highlands, Alps, Western Alps, Southwestern Alps, Dauphiné Alps, and the Ecrins Massif. Among the 404 named peaks in the Ecrins Massif, it is ranked as the 140th highest. The surrounding landscape is high-alpine, rugged, and defined by glaciated terrain and steep ridges typical of the region.
Neighbouring peaks
The immediate vicinity of Bosse Coolidge features several notable summits and mountain passes:
- Pic Coolidge (peak), 3,775 m, 0.9 km W
- le Fifre (peak), 3,680 m, 1.2 km NW
- Col Des Avalanches (mountain pass), 3,499 m, 1.4 km NW
- Les Écrins (peak), 4,102 m, 1.6 km NW
- Pic Lory (peak), 4,086 m, 1.7 km NW
- Breche Lory (mountain pass), 3,974 m, 1.9 km NW
- Dents de Coste Rouge (peak), 3,373 m, 2.0 km SW
- Dome de Neige Des Ecrins (peak), 4,015 m, 2.0 km NW
The nearest higher peak to Bosse Coolidge is Pic Coolidge, situated 0.9 km to the west at an elevation of 3,775 m.
The view from the summit
From the high elevation of Bosse Coolidge, several major alpine giants are visible within a 25 km radius. The highest peaks within this range include La Meije at 3,982 m, positioned 11.7 km NW; Sommet de l'Ailefroide at 3,953 m, located 2.9 km S; and Mont Pelvoux at 3,943 m, lying 2.5 km SE. Additionally, climbers can spot Le Rateau (Est) at 3,809 m, 12.2 km NW; Clocher Des Ecrins at 3,808 m, 2.2 km NW; and La Grande Ruine at 3,765 m, 7.2 km NW.
The range
Bosse Coolidge is part of the Ecrins Massif, which sits within the broader Southwestern Alps, Western Alps, Alps, and Central European Highlands. The highest peak of the Ecrins Massif is Les Écrins, reaching 4,102 m and located just 2 km NW of Bosse Coolidge. The entire massif contains 404 named peaks, within which Bosse Coolidge ranks as the 140th highest.
Climbing routes
There are five established routes for Bosse Coolidge, utilizing alpine grades (F to ED). The South couloir provides an ascent with a grade of PD (engagement III), 1,470 m of height gain, usually taking 1 day, facing south, and completed without a specific named hut start. The Couloir Dewèze carries a grade of AD+ (engagement III) with 1,500 m of height gain, usually taking 1 day, facing northeast, and accessed via Bivouac aux Balmes de Francois-Blanc. The Couloir Dérobé features a grade of AD+ (engagement II), 1,430 m of height gain, 1 day duration, facing north, and is also accessed via Bivouac aux Balmes de Francois-Blanc. The Right Deweze couloir is graded D, involving 1,500 m of height gain, taking 1 day, and faces northeast. Finally, Goulotte Ritchy is a technical line graded TD− (engagement III) with 1,470 m of height gain, usually 1 day, facing east, via Bivouac aux Balmes de Francois-Blanc.
Climate and weather
Climate data estimates from NASA POWER for the years 2001 to 2020, adjusted to the summit elevation, indicate that the warmest month is August with a mean temperature of about 4 °C, while the coldest month is February at about -12 °C. Mean temperatures at the summit rise above freezing only during June, July, August, and September. Precipitation in the surrounding area totals about 850 mm per year, with May being the wettest month at about 90 mm of precipitation, and February the driest at about 55 mm. Common hazards in this alpine environment include sudden weather shifts, strong winds, and cold temperatures.
Best time to visit
The optimal window to visit Bosse Coolidge aligns with the months that experience mean temperatures above freezing at the summit: June, July, August, and September. During these summer and early autumn months, conditions are most favourable for alpine climbing, though climbers must still remain vigilant regarding snow conditions, rockfall risks, and rapid weather changes typical of high-altitude alpine zones.
Nature and wildlife
The terrain surrounding Bosse Coolidge consists of high-alpine rock, snow, and ice, featuring sparse vegetation limited to hardy lichens and low-growing alpine plants at lower elevations within the massif. Wildlife includes adapted species such as the chamois, ibex, alpine marmot, and various high-altitude birds. A significant portion of the area is legally protected, as the mountain is located at or near the Parc national des Écrins (cœur) protected area.
Guides and organised ascents
A certified mountain guide is highly advisable for tackling high-elevation alpine routes and technical terrain such as those found on Bosse Coolidge. Qualified guides in France belong to the French National Mountain Guides Union (Syndicat National des Guides de Montagne (SNGM)), which is a member of IFMGA/UIAGM. For climbers looking to arrange professional support, national organisations like the Fédération Française des Clubs Alpins et de Montagne (FFCAM) or established entities such as the Compagnie des Guides de Chamonix (Chamonix-Mont-Blanc) serve as major references for mountaineering in France. Guided ascents typically cover professional instruction, route planning, and technical leadership, with pricing usually dependent on the number of days, group size, required hut nights, and technical equipment needs.
Safety and preparation
The height and technical terrain of Bosse Coolidge demand proper acclimatization, solid alpine mountaineering skills, and appropriate glacier travel equipment. Climbers must be prepared for extreme cold, technical couloirs, and changing weather conditions. In the event of an emergency in the mountains, the designated emergency number is 112. When called from the mountains, 112 routes directly to the competent rescue service, which is usually the gendarmerie PGHM or CRS Montagne.
Interesting facts
Bosse Coolidge ranks as the 140th highest peak among the 404 named summits of the Ecrins Massif. Its nearest higher neighbour is Pic Coolidge, situated just 0.9 km to the west. The high point of the entire range, Les Écrins, stands at 4,102 m only 2 km northwest of the peak. Furthermore, the mountain is situated within the protected core boundaries of the Parc national des Écrins.
FAQ
What is the elevation of Bosse Coolidge? Bosse Coolidge reaches an elevation of 3,343 m.
Where is Bosse Coolidge located? It is located in France, within the Provence-Alpes-Côte d'Azur region, Hautes-Alpes district, and municipality of Briançon, positioned in the Ecrins Massif.
What mountain range does Bosse Coolidge belong to? It belongs to the Central European Highlands, Alps, Western Alps, Southwestern Alps, Dauphiné Alps, and the Ecrins Massif.
What are the nearest peaks to Bosse Coolidge? The closest peaks include Pic Coolidge at 0.9 km W, le Fifre at 1.2 km NW, and Les Écrins at 1.6 km NW.
How hard is it to climb Bosse Coolidge? The easiest route listed is the South couloir, which is graded PD (engagement III) on the alpine scale. Harder routes like the Goulotte Ritchy reach up to TD− (engagement III) and require advanced technical ice and mixed climbing skills.
Is there water on the way to Bosse Coolidge? OpenStreetMap shows no permanent springs or streams directly along the high alpine routes, so climbers should plan to carry 1.5 to 3 litres of water or melt snow using a stove, ensuring all natural water sources are properly treated before consumption.
Are there huts on Bosse Coolidge? OpenStreetMap shows no hut or shelter within 2 km of the top, so hikers and climbers usually plan the ascent as a day trip or carry their own bivouac equipment, though certain routes make use of the nearby Bivouac aux Balmes de Francois-Blanc.
What is the mobile phone coverage like on Bosse Coolidge? There are 5 communication masts mapped within 10 km, with the nearest located 3.8 km E. While an open summit may allow a signal, coverage can be unreliable in deep couloirs and behind ridges; emergency calls via 112 work across any available network, and digital maps should be downloaded beforehand.