Climbing Mont BlancThree Summits
Climbing Mont Blanc via the Three Summits: Trois Monts
9 - 15.09.26
Mont Blanc via the Three Summits: Don't just climb, but walk with soul
The Trois Monts ("Three Mountains") route is more than just a way to reach Western Europe's highest peak. It's a true traverse: Mont Blanc du Tacul (4248 m), Mont Maudit (4465 m), and Mont Blanc proper (4810 m). Three four-thousanders in a single ascent. Spectacular, technical, and without the crowds of the classic route via Goûte.
But Trois Monts is technically more challenging (category AD- versus PD+), longer, and more demanding in preparation. People don't come here just to see what happens and then figure it out. They come here prepared.
At PVD Club, we prepare people for high-altitude climbs. This guide is a distillation of our experience: training, acclimatization, gear, weather. Everything to ensure you reach the summit and return with a smile, not the thought of "never again."
Admit it: you've already imagined yourself at the top of Mont Blanc. Snow, sun, clouds somewhere below, you're standing with an ice axe, feeling like the main character in a mountain movie.
Now imagine this: it's 2 a.m., freezing cold, and you're crawling up a glacier, wondering, "Why did I sign up for this?" Now that's Mont Blanc. Which scenario works out depends on your preparation.
The route starts at the Aiguille du Midi (3842 m), where you'll be dropped off by cable car from Chamonix. Then, descend along the famous Arête des Cosmiques ridge and spend the night at the Cosmiques refuge (3613 m). The start is at 2:00 a.m.
What are Trois Monts really?
First, a climb up the snowy slope of Mont Blanc du Tacul—400 meters of elevation gain with a steepness of 30-40°. Then comes a plateau and the most challenging section: a 300-meter climb to Mont Maudit with slopes of up to 45-50°. There are almost always fixed ropes there, and the climb is carried out with jumars. Then comes the Col de la Brenva saddle (4350 m), the last rest stop, and the final ascent to the summit of Mont Blanc.
Total: 6-8 hours ascent, 4-6 hours descent. Total walking time: 12-16 hours at an altitude of 3600-4810 m.
This isn't a walk in the park. It's a challenge. But it's doable—if you prepare.
Climbing program: day by day
Day 1: Arrival in Chamonix
Transfer from Geneva (1-1,5 hours). Hotel check-in. In the evening, meet your guide and check your gear. Need some crampons? Chamonix has dozens of rental shops with quality gear. Advice: only rent gear you don't mind breaking. Bring your own tried-and-true gear.
Day 2: Walking and easy adaptation
Trekking in the valley or climbing Brevent (2525 m) by cable car. No rush, no feats. The goal is simply to let your body understand: "We're in the mountains." In the evening, there's a briefing: working with crampons, an ice axe, and roped movements.
Day 3: Acclimatization hike – 3500+
Ascent to the Aiguille du Midi. From the station, there's a short hike to the Vallée Blanche glacier. We'll work with crampons and walk roped together. The main thing is to test your skills at altitude: how you breathe, how your head feels. In the evening, we'll descend to Chamonix.
Day 4: 4000+ Reach
An alternative is to climb the Aiguille du Tour (3542 m) or Pointes Lachenal. Ideally, a short ascent followed by a return descent. Climb high, sleep low—the gold standard for acclimatization.
Day 5: Rest
Sleep, eat, don't do anything useful. The guide checks the forecast. If the weather turns bad, we postpone the assault for a day or two. That's what the extra day is for.
Day 6: Exit to the Kosmik shelter (3613 m)
In the morning, take the cable car to the Aiguille du Midi. Descent along the ridge of the Arête des Cosmiques. The ridge is narrow, with steep cliffs on both sides. Many people get stuck—that's normal. Trust your guide, watch your steps. Then, across the glacier to the hut.
The Cosmique refuge is one of the best in the Alps: hot food, showers, decent beds. But the altitude is already 3613 meters. Sleeping will be terrible—that's normal. Drink water, take some ibuprofen, and lights out at 20:00 PM.
Day 7: Assault - Mont Blanc du Tacul, Mont Maudit, Mont Blanc
01:00 — Wake up. Light breakfast (porridge, tea, granola bar). No coffee—it dehydrates and increases heart rate.
02:00 — Exit. The headlamps are on, the harness is checked. The first 15 minutes are the descent from the shelter and a short approach to the foot of Takul. Everything is still ahead.
02:30–05:00 – Mont Blanc du Tacul (4248 m). A 400-meter climb along a snowy slope at 30-40°. Slow pace, step by step. If there's a line at the fixed ropes, wait, don't overtake. At 4000m, the main virtue isn't heroism, but patience. We traverse the summit of Takul, just below.
05:00–07:00 — Mont Maudit (4465 m). Descent to the plateau and ascent to the Cursed Mountain. The most challenging section: 300 meters of steep climb with inclines up to 50°. There are almost always hanging ropes—the climb is done with a jumar. It's exhausting. Save your breath, don't twitch. Traverse the summit—and a short break before the finale.
07:00–07:30 – Col de la Brenva (4350 m). Rest. Drink, eat, breathe. Whatever the weather, take off an extra layer if it's hot. You'll freeze on the descent.
07:30–09:00 — Final assault on Mont Blanc (4810 m). 450 meters of ascent along a gentle ridge. Technically, it's the easiest. Practically, it's the hardest. The altitude is oppressive, fatigue has accumulated, every step is an effort. But it's here that everything is decided.
09:00–09:30 — At the summit. 4810 m. If the sky is clear, the Alps are before you: the Matterhorn, Monte Rosa, Gran Paradiso, and even the southern slopes on the horizon. 20 minutes of happiness. Photo. The feeling of "I did it."
09:30–14:00 — Descent. Whether to go via the Goût refuge or back along Trois Monts is up to the guide, based on the route and weather conditions. The descent won't be a leisurely one: fatigue sets in, concentration wanes. It's on the descent that most mistakes happen. Be careful.
~15:00 — Downstairs. Chamonix, shower, khinkali, or fondue—whatever you prefer. You deserve it.
Day 8: Spare
Why it's needed. The weather in the Alps is unpredictable—wind, snow, and fog can linger for 2-3 days. If the summit pushes back, this day saves the day. If everything goes according to plan, you can spend it climbing, hiking, or relaxing.
Day 9: Departure
Transfer to Geneva. Or continue your journey—Italy, Switzerland, wherever. You've earned a vacation.
Weather and best season for Trois Monts
On Mont Blanc, the weather is everything. You can be in excellent shape and have perfect gear, but if the weather is bad, you won't see the summit. You can set out with minimal preparation and still find a window of opportunity.
Seasons
June: There's still a lot of snow along the route. The crevasses are filled in—the glacier appears solid, but that's deceptive. The weather is unstable: cyclones alternate, with windows of one to two days. The success rate is 60-70%. The advantage is that there aren't many people around.
July: A popular month. The weather is more stable, with more sunny days. The Kosmik shelter is fully booked—book 2-3 months in advance. The first half of July is better than the second: during the latter half, cracks begin to melt more actively, and the danger of rockfalls increases in the upper part.
August: The best time. The weather is extremely stable, with windows of 3-5 days. There's less wind. The success rate is 75-85%. Yes, there are more cracks, but team discipline makes the difference. Best dates: August 1-20.
September: The first half is for experienced climbers. There are almost no people, and the weather is still holding. But the nights are colder (around 0 degrees at the shelter). After September 20th, the windows become rare, and fresh snow along the route increases the avalanche danger.
Temperature by altitude
- Chamonix (1035 m): daytime +20…+28 in summer
- Aiguille du Midi (3842 m): daytime 0…+8
- Kosmik Shelter (3613 m): -2…-8 at night
- Mont Blanc summit (4810 m): -8…-20 depending on the month and wind
Rule: for every 1000 meters of elevation gain, the temperature drops by 6-7°C. With the wind, it feels like -25°C at the summit.
Where to watch the forecast
Regular weather apps don't work for Mont Blanc—the terrain is too unique. Use:
- Mountain-Forecast.com: Gives an accurate forecast for an altitude of 4810 m. Check the wind (up to 30 km/h is ok, 50+ is canceled).
- Meteoblue: good for understanding the overall picture in the region.
Signs of a good window: Clear skies in the morning, wind at the summit up to 30 km/h, no precipitation for 48 hours, atmospheric pressure stable or rising.
When not to go: Winds above 50 km/h – cancel. Thunderstorms in the valley – wait a day. Fresh snow at 4000+ – avalanche danger, wait 24-48 hours.
Comparison: Trois Monts
| Parameter | Trois Monts | Classics (Gute) | Kazbek (from Georgia) | Elbrus |
|---|---|---|---|---|
| Height | 4810 m | 4810 m | 5054 m | 5642 m |
| Complexity | AD- | PD+ | PD | PD |
| Walking day | 6-8 hours up | 5-6 hours up | 10-14 | 7-10 |
| The technique | High | Average | Average | Average |
| People on the route | Little | Lots of | Moderately | Lots of |
| Price (guide + equipment) | from € 2500 | from € 2000 | from $ 650 | from $ 1800 |
Equipment: What you really need to carry
You'll have an easy day at Trois Monts: a 30-45 liter backpack, carry everything you need, and the rest will be at the shelter. Here's the list with my comments—no water, just practice.
Footwear
- Mountaineering boots B2 or B3: Definitely. No trekking shoes—the soles need to grip crampons on a 50° icy slope. Worn-in, not new. A new pair guarantees blisters.
- Flip-flops/Crocs: for the shelter. Trust me, after 12 hours in these boots, you'll be blessing these rubber slippers.
- Socks: 2 pairs of thermal socks (merino). Not cotton! Cotton is the killer—it gets wet, doesn't dry, and gets sweaty.
Clothing - a system of layers
- Base: Thermal underwear (top and bottoms). Quick-drying. Two sets—one for daytime walking, one for overnight stays.
- Middle layer: Polartec 100-200 fleece. Lightweight, breathable, warm.
- Upper layer: A membrane jacket (Gore-Tex or similar) and membrane pants. With a hood that fits over the helmet.
- Down/synthetic: A light, insulated jacket for rest stops and the summit. Even in August, on a summit day at 4800 meters, it can be -15 degrees Celsius with no wind.
- Assault pants: Down or synthetic insulated. Thermal underwear and softshell pants are too little for the summit, I've tested it.
- Gloves: thin fleece (for the rope) + thick insulated waterproof (for the top).
- Hat, buff, mask: At 4000+, the wind is no joke. A buff to protect your nose and cheeks.
Climbing equipment
- Cats: 12-tooth steel, with anti-balloon (antipodal). Try them on with your boots beforehand.
- Ice axe: classic, 50-70 cm. Not technical - you won't be climbing waterfalls.
- Helmet: Definitely. The seracs on Takul are no joke.
- Binding: comfortable, with wide straps over the down jacket.
- Carabiner with clutch + trigger: standard set for glacier.
- Trekking poles: For approaching. On the glacier, you hand them over to the guide or leave them at the shelter.
Electronics and Hydration
- Headlamp: With new batteries! Start at 2am – no lights required.
- Thermos (0,5-1 l): Hot tea during rest stops is your dopamine.
- Water bottle (Nalgene 1L): Plastic freezes, Nalgene with a wide mouth does not.
- Sunglasses category 3-4: Without them in the snow, you'll get conjunctivitis in an hour. Spare ones are a must.
- SPF 50+ cream and lip balm: At high altitudes, ultraviolet radiation is present even in the clouds.
Medicine chest
- Ibuprofen - for headaches.
- Diacarb - subject to doctor's approval.
- Nasal spray with sea water - mountain air dries out mucous membranes.
- Callus patches (Compeed) - be sure to apply them to problem areas as a preventative measure.
- Sorbents - many people experience stomach cramps at altitude. Physical preparation: how to train for Trois Monts
The level of fitness for the Trois Monts is higher than for the classic route. Here's a test: can you walk 12 km with a 10-12 kg backpack and a 1000 m elevation gain in 4-5 hours without stopping to "die"? If so, you've got the base. If not, read on.
Frequently Asked Questions (FAQ)
This is my first four-thousander. Should I start with Trois Monts?
No. It's better to climb the classic route via Güte—it's more forgiving of mistakes in pace and technique. Trois Monts is a route for those who have climbed 4000+ meters, worn crampons on steep ice, and know how jumar works.
How many days should be allocated?
A minimum of 7-8 days from arrival to departure, 5-6 of which are for acclimatization and approach. A two-day program ("arrive and go") only works for those who live at altitude. For the average person, this is a recipe for altitude sickness and disappointment.
Is it necessary to take a guide?
Technically, you can do it yourself if you have mountaineering experience, glacier tactics, and rescue skills. In practice, 99% of commercial ascents of Mont Blanc are guided. You're not paying for "showing the way," but for the decision: "Do we go or not?", for weather assessment, and for safety in the crevasse glacier.
Do I need insurance?
Yes. Not a standard medical insurance, but a mountain insurance policy—covering rescue operations and helicopter evacuation. It costs between €50 and €150 per week. A helicopter call in France starts at €5000 without insurance.
Book a shelter in advance?
The Kosmik shelter has only about 50 beds. In July and August, reservations are booked 2-3 months in advance. If there are no beds, your only option is to wait for a refusal. Always book in advance.
What should I do if I don't make it before the cable car closes?
Descend to the Güte refuge and spend the night there, or descend to Nid d'Aigle (2-3 hours on foot). The guide always has a backup plan. Your goal is to reach the bottom, not to catch the last train.
What is the difference between the Three Summits and the Three Mont Blancs Traverse?
These are the same thing. Trois Monts, Three Monts, Three Summits are the French, English, and Russian versions of the name of the route Mont Blanc du Tacul – Mont Maudit – Mont Blanc.
Will preparing for Kazbek help Mont Blanc?
Yes, the training sessions overlap by 80%. Kazbek is higher (5054 m vs. 4810 m), but Trois Monts is technically more challenging. If you've trained for Kazbek, your physical base will be sufficient. Add some rope work, ice axe training, and increase the duration of your walking sessions.
Сonclusion
The Trois Monts is not the easiest way to climb Mont Blanc. But it is the most beautiful. Three distinct peaks, icy slopes, ridges, and finally, at 4810 meters, where Italy, France, and Switzerland are all beneath you.
This requires preparation. Real preparation, not the "I don't care, I'll go to the gym" mentality. Eight weeks of training, proper acclimatization, good gear, and respect for the mountain.
But if you do it right, it will be one of the most powerful memories of your life.
Ready to test yourself? Browse our Alpine climbing programs and choose a date. If you have any questions, contact us. We'll answer them personally, no templates required.
