Aiguille de la Grande Sassière

I don’t consider myself a particularly keen sportsman at all, but I can run 15 km (at my own pace, of course – bearing in mind I don’t cover more than 8 km an hour). And I walk a lot; I recently covered 350 km in 16 days on the GR 34 in Brittany.

I’ve climbed to the summit of the Aiguille de la Grande Sassière twice (August 2024 and August 2025) and didn’t experience any particular difficulties – no shortness of breath or problems with the altitude…
The only difficulty I experienced was the section after the first plateau, where on one side there’s a 1,000-metre drop and on the other the glacier. I found myself looking down at my walking poles and shoes to better cope with a distinct feeling of vertigo…
The first time I reached the second plateau, I could see the path leading up the slope and wondered if I’d manage it, given that at times the gradient reaches 40 per cent!
But it only took me an hour to reach the summit, and a total of four hours from the start at the dam.
The views from the summit are truly breathtaking: Mont Blanc, the Grandes Jorasses, the Matterhorn, the Monte Rosa and Gran Paradiso massifs, the Grande Casse, the Grande Motte, Mont Pourri…
On my first attempt, after returning to my car, I set off again after a coffee break to complete a circular route around Lac de la Sassière, which added another two hours’ walking and 220 metres of elevation gain!
I was in top form that day! 👍

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Date of your route : Jul 26, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Very busy route : Yes

WARNING – do not underestimate this hike
This hike is classified as very difficult and fully deserves its rating. I’m a fairly sedentary person who does weight training twice a week and can barely manage a 10km run; I’d say I’m in reasonably good shape, and yet… This was the most difficult hike I’ve ever done.

We set off at 9.30 am (a big mistake – I’d recommend setting off at 7.00 am ideally) as we were returning from a night at Lac de la Sassière, where it was 11°C with a bit of sunshine. You quickly feel the elevation gain; it just goes on and on. Tiring, but nothing insurmountable. There were a few sections with ladder rungs carved into the rock to help, but not over a drop. Some other sections required using your hands for extra security. For those with a fear of heights, the hike can be very frightening. During the hike, the weather turned cloudy and the temperature plummeted (below freezing at the summit).
My partner was very cold; luckily, we had the necessary kit in our rucksacks to cope with it.
Please note, the route isn’t very well signposted; on several occasions we took the wrong path for about thirty metres before realising our mistake, but thankfully Visorando helped us find our way back quickly. Then, halfway through the hike (checkpoint 2), the altitude and accumulated fatigue began to make the hike physically exhausting. When we reached checkpoint 3 (3,300 m), we thought we weren’t far from the end, but it turned out that, with the fatigue and, above all, the effects of the altitude – which shouldn’t be underestimated (shortness of breath, the cold, headaches) – the hike had become extremely difficult. All the more so as the final section of the hike is very steep. Over the final 200 metres of ascent, we couldn’t manage more than 10 steps without having to stop to catch our breath.
It wasn’t our physical strength that got us to the summit, but our mental resilience, as we really had no energy left at all. As we were in the clouds, we didn’t get to enjoy the views at all, either during the hike or at the summit. The ascent took 6 hours, including a lunch break, followed by the descent, which was very long and gruelling due to our accumulated fatigue. In the end, the whole hike took us 10 hours instead of the 7 hours originally estimated.

We’re proud to have reached the summit, but if we’d known in advance what lay ahead, we wouldn’t have done the hike as it was too difficult and dangerous at that altitude given our level of fitness.

In short, this review is simply intended to warn anyone planning to do this hike.
If you’re not used to high-altitude hiking and aren’t fit enough (able to run 10km easily), I strongly advise against attempting this climb.

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Date of your route : Jul 15, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

1,450 metres: mountain pastures, rocky outcrops and ridges follow one after another. No snow or ice on 9 July 2026. A 360° view from the summit, though these views can be seen from most of the neighbouring passes.

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Date of your route : Jul 06, 2026
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A hike enjoyed in lovely weather. We set off at 6.50 am from the Saut car park.
The ascent is gradual. If you come across a technically challenging section (climbing using your hands), it means you’re off the path. No exposed sections.
We spotted some chamois very close by at the pass before the final climb. The final climb is demanding in terms of cardio but is manageable, although it’s very steep on schist ground.
The view from the top is breathtaking. There’s plenty of space to rest before the very long descent!

In terms of fitness, you need to be a regular hiker or a fit person capable of running 10 km.
The ascent and descent take 7½ hours, plus an hour to take in the views at the top.

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Date of your route : Sep 18, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Superb, challenging hike with exceptional views (including the Swiss Alps).
We took ice axes and crampons but didn't use them. (There was no snow on the route, only hard ground on the last 200 metres of elevation gain). We came across a few people wearing forest crampons: this option seems interesting to me.
We are in our seventies and completed the climb in 5 hours.

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Date of your route : Aug 25, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

Very beautiful hike. Incredible view

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Date of your route : Sep 06, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

I agree with everything the author says and recommends. Only to be done in excellent weather conditions (which was the case for us). A very demanding but superb hike (magical ridges and summits)! Don't forget your crampons (many people turned back before the last ridge because they didn't have crampons, which I think were essential that day...). An incredible memory!!! Thanks to the author

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Date of your route : Sep 07, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

There was a crowd today from 8am, my departure time
The trail was well marked and easy to follow except for a rocky section with several possible routes.
The climb was steep but not too difficult, except for the final ascent.
Today, the trail was sometimes covered with icy snow.
I bypassed it on scree slopes, which were almost always stable, but sometimes you have to change direction when it's unstable or you reach a snowy area.
Very difficult.
Magnificent view from the top.
For the descent, I put on my crampons, which I should have done on the way up, and I was able to follow the trail, with the crampons gripping well in both icy snow and earth
It becomes easy.
Thank you for the trail and the instructions

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Date of your route : Sep 01, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

Departure from the car park at 7:45 a.m. with a return time of 7 p.m. on 20 August 2025. The trail is quite busy (which is normal for the highest hike in Europe), so you need to be in very good physical condition as the last ramp is very steep and high altitude. You also need to be careful of possible freezing/thawing conditions on this section.
Unfortunately, at the summit, there was a thick cloud hanging over the rock face.
Be sure to take the path on the left at the junction at point 2, on the glacier side, in the direction of the ascent.

Otherwise, the route along the ridges is magnificent.

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Date of your route : Aug 13, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

Great hike, with a summit offering breathtaking views.
I did it with my dog in 2 hours and 40 minutes, taking the paths on the left on the way up (no ladders and less vertiginous than the ridge path)
An "accessible" hike (well-marked trail with no major technical difficulties) but physically challenging: several (very) steep sections and prolonged effort at altitude (three-quarters of the route is above 2,500 metres and half is above 3,000 metres), so take this into account depending on your fitness level.
Quite busy, especially in summer - I didn't need crampons (everything was melted on the route), but you should bring good shoes and something to cover up with when you reach the summit.

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Date of your route : Aug 15, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

hike completed on 15 August. Departed at 5:15 a.m. from the car park and there were already about ten people ahead of me. The climb took 3½ hours, including all the short breaks, and the view from the summit was sublime. The route is very well marked: as indicated, at point 2, stay on the left-hand path and do the same just before point 3. But given how busy it was, it would have been difficult to get lost! I passed about 150 people on my way down!
Please note, as indicated, this hike is for people who are already used to walking in the mountains. The last climb is steep and icy patches make it dangerous. Suitable footwear and clothing are essential (it gets cold quickly towards the end of the route, despite the physical effort)

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Date of your route : Aug 16, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

Taken in August 2025, lots of people at the car park from 8 a.m., quite a few at the summit. Nice 360° view.

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Date of your route : Aug 11, 2025
Reliability of the description : Not used / Not applicable
Ease of following the route : Not used / Not applicable
Route interest : ★★★★★ Very good
Very busy route : Yes

Second climb to the summit of the Aiguille de la Grande Sassière after a first attempt on 5 August 2024.
I was very surprised to see so many vehicles parked in the Saut car park in the early evening!
Last year, there were less than 10, and now there were nearly 30!
Got up at 5:10 a.m., no chill in the air.
I started the hike at 6:25 a.m. and took four hours with a few short breaks. Exactly the same time as last year!
At the top, I chatted with a semi-professional trail runner who trains every day and made it up in 2 hours and 15 minutes! 😲
Since I knew the terrain, I felt more confident than last year. But I came across a section that caused me some problems.
I just had to get over a small rock ledge that wasn't very high, but the footing was very slippery, with a definite risk of slipping and ending up on the glacier. I didn't remember this section from last year. And despite several attempts, I couldn't do it!
A very nice couple (Anne-Marie and Patrick) held one of my feet so that I could get over the rock! What a relief! I reached the summit at 10:25 a.m. and was very surprised to see so many people there!
I stopped for an hour and 20 minutes at the summit to admire the view. There was some mist and it was a little overcast on some of the peaks (Matterhorn, Monte Rosa, Gran Paradiso), whereas on my first climb it was completely clear, cloudless and very sunny...
At the start of the descent, I met my "two saviours" from the morning again, and I walked with them, accompanied by another very friendly hiker, with whom I talked about Nepal. We took our time getting back to the car park (a little over 3 hours), stopping several times to enjoy the beautiful views of the Dent Parrachée (3,696 m), the Grande Motte (3,653 m), the Grande Casse (3,855 m), the Grand Bec (3,398 m), the Dôme de la Sache (3,601 m), the Mont Pourri (3,779 m), the Albaron (3,637 m) and the Pointe de Charbonnel (3,752 m) ...
This is probably one of the most beautiful hikes in France, but I fear that in the near future, it may unfortunately turn into a "motorway"! 😞

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Date of your route : Aug 10, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A magnificent hike with breathtaking views, but you have to work hard for them on the final climb.
It's not suitable for everyone; you need to be fairly fit.
otherwise, if you do it in the middle of summer in perfect weather conditions, it offers spectacular views.
However, there are a lot of people at the summit (thanks, Instagram 😅), so you really need to get up early to avoid the crowds, but even at 6 a.m., it was already starting to get busy, and it's impossible to be alone up there 😅.
The trail is clear, except for one spot on a ridge where you have to climb over some rocks. It's not the easiest part to find, but you quickly realise that if you take the wrong path, you won't be able to continue.
The car park is right in front of the start and you can even pitch your tent there.

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Date of your route : Aug 08, 2025
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

We left Le Saut at 6:25 a.m. and reached the summit at 10:50 a.m. We stayed there for an hour. It was the most beautiful view of our lives!
There were lots of people on the route, so we were able to easily find the right path when we needed to avoid the tricky section at point 2 and at the arrival point on the edge of the glacier. Despite above-zero temperatures, there were a few patches of ice between 3,400 and 3,650 metres, but no more snow on the route.
The weather conditions were almost perfect:
- exceptional visibility: Mt Viso, Ecrins, Mont Blanc, Jorasses, Grands Combins, Matterhorn, Monte Rosa, Gran Paradiso...
- mild temperatures: +5°C at the summit at 11:30 a.m
- nW wind 20-25 km/h, we quickly put on warm clothes at the summit.
Well acclimatised to the altitude (staying in an apartment in Tigne le Lac (2,100 m) since 2 August, we did three training hikes, including the Ouille Noire (3,300 m).
We found the ascent of the Grande Sassière less challenging than that of the Barrhorn (3,610 m) last year at the same time of year, starting from the Turtemannhütte.
In summary, training, acclimatisation to the altitude, good weather without snow or fog, and a desire to discover the panorama will enable you to reach the summit.
Patrick and Marie-Luce (aged 63 and 61, married for 37 years on 8 August at 11:20 a.m.!

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