Welcome to our second Tour du Mont Blanc conditions report of 2025. Follow our TMB conditions posts for monthly photos, trail descriptions and weather reports. Make sure to bookmark our main Trail Updates page so you can get more information next month!

Throughout the summer, we’ll also include information about local events, such as music festivals or village celebrations; scroll down to see what’s on this month.

The information in our TMB conditions reports come from local guides who are currently out on the trail. Our intention is to help 2025 TMB hikers get the most from their experience. To learn more about early TMB conditions, read this post from last month. You might also find this post helpful if you’re planning to hike the TMB in June 2026, or another year in the future. Of course, the weather varies year-by-year, but by reading this post you’ll get a basic idea of what TMB conditions are like in June, and what the weather is generally like. As we go along, we’ll mention what to look out for when planning an early TMB. You might also find this page on TMB weather useful.

We’ve been hiking, running and guiding around the classic route… read on to see what we’ve found in each sector!

Disclaimer : We describe our own observations and experiences on the TMB trail. Of course, conditions change quickly in the mountains, so please make sure that you have the correct experience to hike in the high mountains if you are not using a guide.

General TMB Conditions

We had fairly typical weather in May – that is, we had a lot of rain but also some warm, dry days, with temperatures reaching 25°c. This is good news for TMB hikers, as it means that the snow is melting quickly from the high passes! At the time of writing (start of June), there are lots of alpine flowers on the trail, and you can even find wild strawberries and blueberries around the Chamonix valley. The lakes are full of crystal clear water to dip your toes in!

June hiking TMB Conditions

The high passes on the classic TMB route are still snowy, but with so many groups now hiking, these passes have good tracks up and over. However, do watch out when crossing snow bridges, as these are quickly melting and can be dangerous – they often cross small streams or slippery rocks. If you are hiking in the upcoming weeks, this is something to be wary of, and something to look for when checking TMB conditions reports.

tmb conditions : Col du Bonhomme

Joel hiked up to Refuge Croix du Bonhomme via Col du Bonhomme on June 3rd. There was still snow from Plan de Dames, with lots of snow on the final traverse between the two cols. We had a bit more snow on Saturday 7th, but the warm, dry weather that followed melted most of the snow. On Saturday 14th June, Pavel reported that the few remaining snow patches that exist are just on the flat, easy sections. Look at the comparison photo below to see what a difference just two weeks can make to the TMB conditions!

There is often a difficult “snow bridge” above Refuge Mottets, which can become dangerous as it thins and starts to collapse (see photos below!). However, by mid-June this had completely gone, which is very good news! You will now have to walk through the river (and so get your feet wet!), but that is much nicer than walking across a thin snow bridge!

tmb conditions : Grand Col Ferret

Joel hiked up to Grand Col Ferret from Chalet Ferret on May 29th. As we found last month, the Swiss side was more snowy than the French side, and in general the pass was holding a fair bit of snow. This snow stuck around for a few weeks, but only on the mellow sections; the steeper sections were snow-free by the beginning of the month.

Bénédicte started guiding a trip on June 5th. You can see a photo below of the only “tricky” snow patch on the way down to La Peule, where the path is narrow but snow-free. Now, at the end of June, Grand Col Ferret is snow-free and the snow patch above La Peule has melted.

Gîte Alpage de La Peule opened partway through June, which is a great place to stop for refreshments!

Conditions in Val Veny

Lauren’s mum and her friend were our first self-guided hikers to do the the route. On Wednesday 4th they sent us these photos of the road to Refuge Elisabetta… there were 3 road blockages where the snow had been piled up, and they needed snow spikes to climb over one of them. A few days later we had another group that managed to cross these blockages without spikes. By the end of June, these blockages have melted.

conditions in Champex and Bovine

On the 9th June Oli sent these photos from trails between Champex and Bovine. At that time the snow crossings were fine, but they became increasingly difficult throughout the month. This is because the crossings go over rivers, and eventually become thin bridges that start to collapse into the water. If you are reading this post for information about future trips, this is something to be aware of, as snow crossings are common hazards in June. When reading TMB conditions reports, it’s a good idea to look specifically at these snow bridges. For anyone starting their hike this year (2025), these crossings have now all melted, except one about halfway up the climb from Champex. This snow bridge will probably stick around until mid- to late July, and will become increasingly challenging to cross.

Another thing to look out for is the water crossing. Because of the snow melt, the water is very deep in June – it will normally come over your boots. If you’re preparing for a trip in June, check current TMB conditions of this crossing. A good tip from Oli and Béné – take your shoes and socks off! Brave the cold water… it’s much better than having wet feet for the rest of the day!

The buvette (small restaurant / café) at the Bovine Alpage is now open, but make sure to call ahead (+41 79 679 23 11) if you’d like to eat a full meal!

tmb conditions : Col de Balme

At the start of June, Oli sent this photo for our TMB conditions report. It shows the final snow crossing up to Col de Balme. It was fairly steep at the top, but it was easy for Oli to help each hiker one at a time. If you’re hiking without a guide and with a mixed-ability group, it’s good to have a more confident hiker spot the others, as Oli was doing here.

By mid-June this snow patch was gone, and even the Swiss side of Col de Balme is now snow-free.

Tmb conditions : variants

As the month of June has been hot and dry, we’ve already had a few groups doing TMB variant routes. Below we’ll describe the TMB conditions of Fenêtre d’Arpette and Col des Fours, which are the more technical variants of the Tour du Mont Blanc.

Fenêtre d’Arpette

Fenêtre d’Arpette is a TMB variant from Champex to Trient. This variant can be challenging if there is a lot of snow still, as the terrain is steep and very rocky. There are often big snow patches that stick around late into the season. However, because we have had an unseasonably warm start to the season, Oli guided a group this way on June 30th. He found very little snow, and most of the bridges have already melted; there is just one tricky snow patch remaining. See below for a photo of the Arpette valley, which is already looking very green.

Col des Fours

Col des Fours is a TMB variant from Les Contamines to Refuge des Mottes / Les Chapieux. Like Fenêtre d’Arpette, hiking this variant can be dangerous when there’s still snow about. However, as you can see from the photos below, there is very little snow left on the trail. Aransxia guided a group this way in the last week of June with no problems.

• 10th – 15th June : Chamonix Film Festival
  This is the fifth edition of the Chamonix Film Festival. Eighteen films will be shown from the Vox cinema in town, and a number of workshops will run from Hotel Plan B and the Café des Aiguilles Gallery. On Friday and Saturday, you can watch two of the films for free in the beautiful Parc Couttet. See the festival’s website for more information.
  
• 21st June : Fête de la Musique
  This annual music festival runs across France to celebrate summer solstice. It is a free event that takes place throughout the day and evening. All of the bigger TMB French villages (Argentière, Chamonix, Les Houches, and Les Contamines) have free music events. Click on the links to find more information about each village’s festival.
  
• 26th – 29th June : Marathon du Mont-Blanc
  If you’re hiking the TMB during these dates, you will likely see some runners! A number of different trail races take place around the Chamonix valley. On the TMB, you might see runners up on Aiguillettes des Possettes, or on the traverse over to Flégère. You can watch the athletes start and finish in the centre of Chamonix, in Place du Triangle de L’Amitié.

We hope this information helps you prepare for your upcoming Tour du Mont Blanc! If you have any questions or comments, please post them below. We’ll add more information soon as our guides get further around the route!