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Arête des Cosmiques rock climbing and portaledge, Chamonix

A unique climbing program in the Arête des Cosmiques in Chamonix, spending a night on a portaledge, along with Mathis, an aspirant mountain guide. Enjoy the best views of the Mont Blanc Massif!

Not specified


2 Days

Jun, Jul, Aug, Sep




I invite you to a unique rock climbing experience in a spectacular scenery. Join me for a 2-day guided rock climb in the Arête des Cosmiques and spend a night in a portaledge!

If you have a good head for heights and a brave spirit, an overnight hanging from the rock is something you have to experience!

It might sound risky, but I assure you sleeping on a portaledge is very safe. It's such a unique feeling, sleeping there with no one around, just us and the mountains. And from the Cosmiques Ridge, we will be able to enjoy a magnificent view of Mont Blanc.

The Arête des Cosmiques, also called Cosmiques Ridge, is one of the most popular routes in the impressive Mont Blanc Massif. It has a few challenging sections, but it is not too difficult. It has varied routes that offer a great diversity of climbing options. Also, it's really exposed and offers amazing views. 

In the program I propose I offer you the option of just sleeping there: going down from the top and installing the portaledge not far from the top, or in the middle of the wall. Or we have the option of climbing up from the bottom of the wall and sleeping in the midddle. Then, with this option, the day after we would either abseil down or climb up.

Please note it’s possible to join this tour with no climbing experience.

If you want to go somewhere else or if the conditions at Arête des Cosmiques are not good, we can do this same program on the Brévent peak or in Annecy, above the lake. These are also 2 amazing spots for this great climbing adventure.

So if you want to be part of this unique experience, just send me a request! We will start planning this adventure in the  Arête des Cosmiques right away.

Price includes

- Guiding fee

- Accommodation included

Price details

The price does not include the guide´s expenses (accommodation, meals, lift tickets, etc).



In a portaledge

More info

I provide you with all the equipment. You need to bring a sleeping bag. I can take a maximum of 4 people with me, with 1 portaledge every 2 people and my own portaledge.

If you want a full day of climbing on Day 2, starting from the bottom on Day 1, the price per person is the following:

1 person: 800€ Group of 2: 400€ Group of 3: 270€ Group of 2: 200€

Meeting point


About the guide

Gauthier and his team of IFMGA/UIMLA-certified mountain guides & leaders and rock climbing instructors (Anabelle, Andrea, Andrej, Claire, Christophe, Daniel, Elis, Enrico, Etienne, François, Guillaume, Ivan, Jessy, Julia, Mathis, Mitja, Olivier, and Robin) are some of the top outdoor adventure professionals in Europe.

Whether you wish to climb some of the best mountains in the Alps or go on an exciting bouldering adventure in Fontainbleau, among other amazing options, they will be able to show you the top spots and the ropes to ensure you have an unforgettable and safe adventure.

Gauthier will be your main point of contact during the booking process and will be able to help you with all the questions you have in order to make sure you receive the best possible guiding service.

Pick one of the programs featured for E-S Adventure Guides and start planning an awe-inspiring experience in the mountains!


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What people are saying about E-S Adventure Guides Team

Serhiy Tkachenko


May, 2023

It was a great climbing day on almost a vertical rock about 70 meters high. Willy is the best guide I ever met in my life, and without him I wouldn't make it.

Kevin C.


June, 2005

Rebecca and I thoroughly enjoyed our time with Stephane and his wife. They were amazing guides.

Krisztina Kovari


April, 2023

We had a great experience with Willy Viez in Wallonie. He shared a lot of useful knowledge with us about alpine rock climbing, especially about lead climbing. His pointers and real life examples turned out to be essential on the following day when we tried to climb an easy route on our own (no quick draws were left behind). Willy assisted us in a way that resulted in great personal accomplishments for the day and he surely helped us to feel more at ease around real rocks. We are very happy with this adventure that has a long lasting after effect.

Claudia Schöninchen


March, 2023

Really enjoyed our day rock climbing in Les Calanques. Great routes and our guide was prepared, very flexible in terms of what we’d like to do and which levels he could do with us. The communication beforehand was a little unclear since I expected an email and didn’t quite get that I’d have to access the web application of explore share. Nothing major, just could be explained clearer in the email.

Moshe Lehmann


March, 2023

The traveller did not leave a comment.

Hannah Sande


January, 2023

We had a great day with Ivan in Fontainebleau. He was so knowledgeable about the area and its history, and about warming up for effective climbing. We had a lot of fun and climbed some very cool boulders despite the very cold weather.

Anne Cyron


December, 2022

My daughter has had a fantastic time at with the horses this week, perfectly organised by Explore-share. We are so grateful to Gauthier for making it all a fantastic experience, thank you!! We will be back.

Ying Sirina


October, 2022

I booked a private shinrin yoku session with Explore-Share, but unfortunately their guide was injured and couldn't do it. Gauthier had been very helpful, quick to communicate and agreed to work with another guide he'd never met. All went well. My first forest bath guided by Magda was powerful and I appreciated the experience so much. She was calm, reassuring, and led all the invitations smoothly and sensitively. An eye-opening experience that will be fondly remembered.

Hamish Bruce


October, 2022

The lift to the via ferrata des Evettes was closed so we did the via ferrata de curalla in Passy. Was a great day!

Nikita Kazantsev


September, 2022

Our guide, Claire, was very friendly, knowing and responsive and helped us to dive into an outdoor bouldring for the first time - exactly what we were looking for

Richard Williams


September, 2022

The traveller did not leave a comment.

Alexandre B



Yesterday was amazing. Olivier is a world class climber and has a natural ability to quickly assess my level and coach me to exceed what I thought I could do. He was very focused on making sure I was safe. Climbing with Olivier yesterday has had a deep impact on my life as a climber. An excellent climbing guide!

Vincent Coquette


September, 2022

Annulé pour la météo

Anne Cyron


September, 2022

We had a fantastic time with our guide and the horses at the stables in Les Houches. Everything was perfectly organised - thank you - we ill be back.

Ellen Patridge


September, 2022

We are so happy we got the chance to have a guided session at Fontainebleau with the E-S Guide team. They were super helpful and responsive, getting me and my climbing partner set up with a trip with <48 hours turnaround from first contact. We worked with Jèrèmie, who was top notch - he knew the area really well and was able to guide both of us to top multiple routes. He met us where we were at with our climbing ability, and was extremely creative at suggesting alternative beta and helping us through problems. THANK YOU!



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