Important:

• This route is technically more demanding, with steep sections and higher exposure, and conditions vary. The 3-day format is also without acclimatization, suitable only for well-prepared climbers. For most clients, a 5-day program is the safer and more effective option.
• Booking the Cosmiques Hut is much easier than securing a spot at the Goûter or Tête Rousse huts. The Trois Monts route itself is a bit more challenging than the normal Goûter route, but with a guide it's perfectly manageable.

Day 1 — Training Climb (Cosmiques Ridge or similar)

• cable car to Aiguille du Midi
• introduction to snow and mixed terrain movement
• ascent of Cosmiques Arête or a similar training route
• ropework and movement practice

Night at Cosmiques Hut (3613 m).

Day 2 — Second Training Climb

• a non-technical but progressive alpine route in the Aiguille du Midi area
• (e.g., Pointe Lachenal Traverse or similar)
• practice of essential techniques
• rest and preparation for the night start

Night at Cosmiques.

Day 3 — Mont Blanc via Trois Monts

Night departure.

• ascent of Mont Blanc du Tacul
• traverse to Mont Maudit
• climb to the upper ridge of Mont Blanc
• summit of Mont Blanc (4810 m)
• long descent via Aiguille du Midi or Goûter (depending on conditions)
• return to Chamonix

Price
Private guide (1–2 people): €1800
(Lift passes, transport, rental equipment, accommodation, and meals in the mountain hut for both the guide and the client are not included.)