Grande Rocheuse

4,102 m

France

Elevation: 4,102 m
Prominence: 52 m
Difficulty: 6/10; Alpine climb
Best Season: May–Jun
Routes: 2

AdvisoryReported 1 Jul 2024
On the Arête du Jardin a rockfall damaged the jammed-block chimney below the crest (reported by La Chamoniarde, July 2024); it is now passed with aid and takes longer.
camptocamp.org
RegulationReported 13 Aug 2026
Chamonix municipal decree 2026-00719 of 13 August 2026 regulates bivouacking around the Refuge du Couvercle; contact the guardian for details or to book.
refugeducouvercle.ffcam.fr

Routes

3D Preview

Approximate line — not for navigation

An automated check found that parts of this line could not be matched to mapped trails, so it may stray far from the real route. Use it for planning only, with a map and a guidebook.

Why? 8 check notes

danger scan: Refuge du Couvercle → Grande Rocheuse: straight line 2754 m (limit 200 m)
danger scan: Refuge du Couvercle → Grande Rocheuse: straight line 2754 m above the last hut/bivouac
danger scan: Refuge du Couvercle → Grande Rocheuse: straight line: 72° over 25 m (> 60°, high-res DEM)
danger scan: Refuge du Couvercle → Grande Rocheuse: sustained 64° > 45° on a straight line
last routed vertex 2748 m from the summit (closed by straight)
29% straight-line fallback
Refuge du Couvercle → Grande Rocheuse: straight (snap_failed; DEM rejected: no path below 45° between the endpoints, 2.8 km)
unresolved waypoints: Échelles des Égralets, Glacier de Talèfre, Couloir Whymper, Col de la Grande Rocheuse

AlpineAD+MixedNormal route

Sources differ: AD (SummitPost; H. Bielefeldt (in good snow))

The usual way to the Grande Rocheuse is the Aiguille Verte's normal route: a night at the Couvercle hut, the Talèfre Glacier, then about 600 m of south-east-facing snow couloir (45–55°) to the col between the Verte and the Grande Rocheuse, and a short rock and snow step to the summit. Only sensible when frozen; descend by abseil before the sun hits the couloir.

Elevation Profile

approximate line

Distance: ≈ 9.5 km; one way
Ascent: ≈ +2,531 m; −343 m lost on the way up
High Point: 4,102 m
Time Up: ≈ 10h 19m; DIN 33466
Time Down: ≈ 7h 24m; DIN 33466 · same way back

The Grande Rocheuse is a 4,102 m top on the Arête du Jardin, about 300 m east of the Aiguille Verte and with only about 50 m of prominence. It has no separate normal route: it is reached from the Col de la Grande Rocheuse at the top of the Couloir Whymper, which most parties climb for the Verte. Tagging both summits from the col adds well under an hour. Day one: from Chamonix take the Montenvers train and the gondola down to the Mer de Glace (the old ladders are closed), walk up the glacier towards the Leschaux confluence, and climb the Égralets ladders on the right bank to the Refuge du Couvercle (2,683 m), 4–5 hours from Montenvers. Rope up on the ladders if unsure; there are fixed karabiners. Day two, leaving around midnight to 01:00: follow the right bank of the Talèfre Glacier below the Aiguille du Moine and the Arête des Ecclésiastiques to the bergschrund of the Couloir Whymper (about 3,400–3,460 m), 2–3 hours. Cross it on the left and climb the narrow secondary couloir, step left onto the rib, then join the main couloir and follow it to the Col de la Grande Rocheuse (about 4,050 m), 2–4 hours on 45–50° snow with steeper sections near the top. From the col a short rock and mixed step of about 30 m leads east to the summit of the Grande Rocheuse; the Verte is 10–30 minutes the other way along a snow crest. Descend the couloir before the sun reaches it: Camptocamp counts about 15–18 abseils from slings on the left bank (looking down), with 50–60 m ropes, then the very crevassed Talèfre Glacier back to the hut. Allow 5–8 hours summit to hut. When the couloir is dry, icy or too late in the day, the safer descent is the long Arête du Moine.

Start

Montenvers1,914 m

Chamonix–Montenvers rack railway and Mer de Glace gondola
Train to Chamonix-Mont-Blanc (via Saint-Gervais), then the Montenvers rack railway and the Mer de Glace gondola.

Stages

Day	Stage	km	m ascent	m descent	Time
1	Montenvers → Refuge du Couvercle	6.8	1,041	267	4h 51m
2	Refuge du Couvercle → Grande Rocheuse	2.8	1,490	76	5h 28m

Waypoints

Station:
Montenvers1,914 m
Rack railway from Chamonix; gondola down to the Mer de Glace
Feature:
Mer de Glace1,970 m
Hut:
Refuge du Couvercle2,688 m
Summit:
Grande Rocheuse4,102 m

Key Passages

Égralets ladders up to the Couvercle hut
Bergschrund at the foot of the Couloir Whymper
Secondary couloir and traverse into the main couloir
Upper couloir to the Col de la Grande Rocheuse (around 50–55°)
Short rock/mixed step from the col to the summit
Abseil descent of the couloir before sunrise warms it

Equipment

0/12 packed

Downloads

Route confidence 70%

Overview

A 4,102 m top on the Arête du Jardin, a few hundred metres east of the Aiguille Verte above Chamonix. It is usually climbed with the Verte by the steep Couloir Whymper from the Couvercle hut, a serious snow climb that is only sensible when frozen.

The Grande Rocheuse stands on the ridge running east from the Aiguille Verte (4,122 m) to the Aiguille du Jardin (4,035 m) and Les Droites, between the Talèfre Glacier to the south and the Argentière Glacier to the north. With about 50 m of prominence it is a satellite of the Verte, but it counts as one of the 82 UIAA 4,000 m summits. Its north-east face, above the Argentière basin, has some of the best modern ice and mixed lines in the Mont Blanc range; its south side drops into the Couloir Whymper.

There is no easy way up. Most people reach it from the Col de la Grande Rocheuse at the top of the Couloir Whymper, the Verte's normal route: about 600 m of 45–55° snow facing south-east, with stone and ice fall once the sun reaches it, descended by a long series of abseils. In summer the more reliable line is the Arête du Jardin (D-), a long rock and snow ridge at around 4,000 m.

Warmer summers have changed the season. Camptocamp now treats the Whymper as a spring and early-summer route, to be avoided in high summer, and recommends the Arête du Moine as the summer descent. Expect a two-day outing from Chamonix with a midnight start, steep snow and a long, committing descent.

Climbing Notes

This is a route for experienced alpinists: confident movement on 50° snow and ice with two tools, efficient abseiling (15–18 abseils on the descent, some from slings), crevasse rescue, and the judgement to turn back when the couloir is not frozen. Fitness for a 12–16 hour day after a short night is needed. Hiring an IFMGA guide is common; Chamonix guides offer the Verte and Grande Rocheuse from the Couvercle hut.

Acclimatise first with nights above 3,000 m and an easier 4,000 m peak. The usual plan: Montenvers train and Mer de Glace gondola, 4–5 hours to the Couvercle hut, depart around midnight, climb the couloir in the dark, reach the col around dawn, tag the Grande Rocheuse (and the Verte), and be off the couloir by about 08:00–09:00. If you are late or the snow is soft, descend by the Arête du Moine. Book the hut well in advance and check conditions with the guardian and the Chamonix Office de Haute Montagne.

History

Robert Fowler with the guides Michel Balmat and Michel Ambroise Ducroz made the first ascent on 17 or 18 September 1865, during the third ascent of the Aiguille Verte, by the south spur (Camptocamp). The first winter ascent was on 17 March 1928 by Max Fischer, Peter Hardegg, Herman Hoerlin and Erwin Schneider. The Arête du Jardin was first descended in 1924 and first climbed on 19 August 1926 by Armand Charlet, André Jacquemart and G. de Longchamp. Antonin Azéma and G. Fraissinet climbed the north-east spur on 12–14 July 1946. In March 2016 Davide Capozzi, Lambert Galli, Julien Herry and Denis Trento made the first ski and snowboard descent of the south pillar.

Season

Best May–Jun

January: Not advisable
February: Possible
March: Possible
April: Good
May: Best (best window)
June: Best (best window)
July: Possible
August: Possible
September: Possible
October: Possible
November: Not advisable
December: Not advisable

Jan: Winter; hut unstaffed, very long approach
Feb: Winter ascents and steep-ski descents in stable conditions
Mar: Spring snow; north-east face ice routes in condition
Apr: Good couloir conditions possible; hut winter room only until the staffed season
May: Often the best month for the Couloir Whymper: frozen snow, fewer stones
Jun: Good snow cover; Couvercle hut staffed from mid-June
Jul: Couloir increasingly dry and stonefall-prone; Arête du Jardin is the better summer option
Aug: Whymper usually not advisable; ridge routes only in cold spells
Sep: Cold spells after fresh snow can bring the couloir back into condition; hut closes late September
Oct: Autumn snow-ice conditions are sometimes good; hut unstaffed
Nov: Winter conditions
Dec: Winter conditions

Access & Permits

Hut Booking

Refuge du Couvercle (FFCAM): online via refugeducouvercle.ffcam.fr or +33 9 82 12 45 03 / +33 7 71 57 77 85. Reservation recommended in the unstaffed period too.

Fees

Montenvers rack railway and Mer de Glace gondola ticket
Refuge du Couvercle overnight fee (FFCAM; booking advised also outside the staffed season)

Rules

The old path and ladders from Montenvers down to the Mer de Glace are closed by municipal decree; use the gondola or the designated alternative
Bivouacking near the Refuge du Couvercle is regulated by Chamonix municipal decree 2026-00719 (13 August 2026); contact the hut guardian

Getting There

Chamonix-Mont-Blanc

Geneva (GVA)

Train to Chamonix-Mont-Blanc via Saint-Gervais-les-Bains-Le Fayet, or bus from Geneva airport
Montenvers rack railway from Chamonix, then the Mer de Glace gondola down to the glacier; about 4–5 hours from Montenvers to the Couvercle hut via the Égralets ladders

Hazards

Rockfall
Glacier
Crevasses
Avalanche
Altitude
Exposure
Weather

Huts & Shelters

Refuge du CouvercleRefugeStaffedBooking required
64 beds · Staffed 16 June – 25 September 2026 (FFCAM gives early April to end of September in general); winter room with 20 places
Book Refuge du Couvercle
2,683 m