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Vallee Blanche Overnight at the Cosmiques hut
Duration:
1 day 1/2
Price from: 440€
Difficulty:
Infobulle générale
Difficulty Level 1: For blue-run skiers capable of making basic turns on wide, gentle slopes - Flocon / 1-Star Level.
Difficulty Level 2: For red-run skiers capable of making parallel turns on wide, steep slopes - Class 1 / Class 2 Level.
Difficulty Level 3: For black-run skiers capable of making short turns on narrow and/or mogul slopes - Class 3 Level.
Difficulty Level 4: For occasional off-piste skiers capable of skiing in powder snow along the edge the piste - Class 4 Level.
Difficulty Level 5: For regular off-piste skiers capable of skiing in all snow conditions off-piste - Competition and Off-Piste Level.
General information
Cosmiques hut - 3 613 m
Located by the Col du Midi and at the foot of Aiguille du Midi, at 3613 meters above sea level, the Cosmiques hut is one of a kind. Second highest mountain hut in France after the refuge du Goûter (3 815m), it once was a laboratory for the study of cosmic rays. The current structure was built in 1991 and is now operated by the Compagnie des Guides de Chamonix. In its basement, the refuge still hosts research activities carried out by the National Centre for Scientific Research. A night at the refuge des Cosmiques guarantees a total immersion in the high mountain world, where the sunrise and sunset are unforgettable.
A legendary run
From the very first step onto the ridge at the Aiguille du Midi, you’re immersed in an unforgettable adventure. With the highest peaks of the Alps all around you, the Vallée Blanche offers a 15 km descent and 2,000 vertical meters through the heart of the Mont Blanc glaciers — a legendary off-piste experience that starts with a short ridge walk secured by fixed ropes, and finishes with a return by the Montenvers train or, with exceptional snow, skiing all the way down to Chamonix.
Group booking
The group formula associates people who do not necessarily know each other. It is ideal for people looking for group friendliness and attractive prices.
⚠️ Snowboarders not accepted in group booking - private only
Dates for group booking
Sunday to Monday, see on-line booking
⚠️ The date should be read as referring to the night at the Cosmiques hut
Guiding policy for group booking
Group from 4 to 6 people. 16 years old minimum accompanied by a parent
Departure for groupe booking
Departure with a minimum of 4 people
Meeting point for group booking
3.30pm at the bottom of the Aiguille du Midi (Info Point)
2026 Price for group booking
440€ per person
✅ This price includes
- Mountain guiding service
- Glacier & avalanche safety gear
- Lift passes
- Hut fees (diner - night and breakfast)
❌ This price does not include
- Ski gear (no snowboard or snowblades)
- Crampons fitted to your boots (mandatory)
- Backpack (mandatory)
- drinks at the hut
- snack
- sleeping bag liner
Private booking
Want to share the Vallée Blanche only with your friends or family? Book a private guide and enjoy a tailor-made descent - Your guide, your pace.
⚠️ Snowboarders welcome only in private booking : telescopic poles mandatory
Dates for private booking
Except Friday and Saturday evening and subject to availability at the refuge
To book, thank you to send an email
Guiding policy for private booking
Group from 1 to 6 people. The number of participants per guide may vary depending on the glacier. 16 years old minimum accompanied by a parent
Meeting point for private booking
3.30pm at the bottom of the Aiguille du Midi (Info Point)
Route for private booking
Chosen according to your level and conditions
2026 Prices for private booking
2 people : 690€ per person
3 people : 540€ per person
4 people : 460€ per person
5 people : 415€ per person
6 people : 385€ per person
✅ This price includes
- Guiding fees
- Glacier & avalanche safety gear
- Lift passes
- Hut fees (diner - night and breakfast)
❌ This price does not include
- Ski gear (no snowblades)
- Crampons fitted to your boots (mandatory)
- Backpack
- drinks at the hut
- snack
- sleeping bag liner (mandatory)
Further information
Find in this section, all the information about this activity. For any further information please contact our advisors (contact details above).
⚠️ A night at high altitude can cause discomfort such as headache, nausea, or insomnia
Duration
From mid-afternoon to late morning the next day
Required level
Normal conditions: ability to ski a steep, mogulled black run in Europe — equivalent to a sustained double black diamond in North America. Not recommended for people with heart conditions
Fresh snow
More technical descent in several dozen centimeters of untracked powder - Class 4/5 level. North American equivalent: Double black diamond + / all-conditions off-piste
⚠️ Suitable skis required
Formality
Participants must have mountain sports insurance with repatriation cover. We strongly recommend that this also includes cancellation cover. You can take out insurance when you sign up
Documents available for download
Equipment
A standard outfit for piste skiing in cold weather is suitable for the Vallée Blanche descent
Equipment
- All-mountain or off-piste skis depending on conditions. Check your bindings before departure.
- One backpack per person to carry skis - mandatory
- Crampons adjusted to your ski boots - mandatory
Clothing
- Standard ski clothing for cold weather
- Spare clothing at your discretion
Accessories
- Ski helmet
- Sunglasses or ski goggles
- Sunscreen
- Snacks
- Sleeping bag liner
- Pills against headach
- Toilet set (No shower / water at the hut)
Our Rental Partners : You can rent your equipment with our rental shops partners and benefit from special price Millet (excluding crampons, ice axes and helmet), Sanglard Sports, Ravanel & Co & Concept Pro Shop
Our Equipment Partners : Millet, Dynastar, Julbo, Grivel & Monnet
Itinerary
Day 1
On the way to the Cosmiques Hut
Walk down the Aiguille du Midi ridge, skis on the pack and crampons on your feet. Short ski descent to reach the base of the Cosmiques Hut, then about a 20-minute walk to reach the hut.
Day 2
Vallée Blanche descent
Morning departure, returning to Chamonix by late morning.
Booking
Book your activity
Calculate your carbon footprint
Discover the carbon emissions of this activity and add your trip to the meeting point.
CO2 emitted per person for the activity: 13 kg. Learn out more about the footprint calculation of this activity
CO2 emitted per person for the activity: 13 kg. Learn out more about the footprint calculation of this activity
CO2 emitted per person for this activity & journey(s) = 0 kgIn order to limit global warming to +2°C by 2100, the COP-21 agreement stipulates that each human should emit no more than 2t of CO2 per year. According to the French Ministry of Ecology, today European citizens emit an average of 11t per year, and American citizens emit an average of 21t annually., or 1.3€The price for a ton of CO2 is currently 100€ in the European Union to offset.
Find out more about our zero impact strategy.
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