Lake Lessy and Aiguille Verte from Le Petit-Bornand

A hike that will take you to Lac de Lessy, then to the Aiguille Verte du Chinaillon. The terrain is varied: mountain pastures, forests, scree, sharp limestone pavements, etc. The landscape is equally varied, culminating in the summit, which offers a 360° panorama of the Bornes, Aravis and Mont Blanc massifs. The area is also ideal for encountering the many ibexes that inhabit the massif.

Details

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  • Walking
    Activity: Walking
  • ↔
    Distance: 13.18 km
  • ◔
    Average duration: 6h 05 
  • ▲
    Difficulty: Difficult

  • ⚐
    Back to start: Yes
  • ↗
    Ascent: + 801 m
  • ↘
    Descent: - 798 m

  • ▲
    Highest point: 2,036 m
  • ▼
    Lowest point: 1,371 m

Photos

Description of the walk

Go to Le Petit Bornand, then turn right in the village onto the Route de Paradis. Park at the end of the road (the route is signposted in blue as "Lac de Lessy").

(S/E) Follow the wide mountain path south-southwest, which continues along the road. After the Pize chalet, the track enters the forest and comes out near the Lainvouet chalet.

(1) The lake trail starts sharply to the left 150 m before the chalet (signposted Lac de Lessy). The trail then reaches the foot of the cliff and, via a steep climb and a short section with steps, leads to the sharp limestone pavement at the summit. A horizontal traverse takes you to the mountain pasture and then to the Col de la Forclaz.

(2) Just below the pass, leave the wide lake path and take the trail on the right that leads to a small pass (unnamed) at the north-east ridge of the Aiguille Verte.

(3) From the pass, the path first follows the ridge and then crosses the grassy south-east face to reach the south ridge. Follow this to the summit (the crossing of the south-east face can be slippery after wet weather). Caution: the last few metres to the Aiguille Verte are steep and require caution.

(4) To descend, retrace your steps back to the pass.

(3: Quickly leave the ascent route and turn right towards the lake)5:: and the chalets of Lessy.

(6) From the huts, rejoin theGR®96, which completes the tour of Lac de Lessy, and resume the ascent route near the Col de la Forclaz.

(2) Follow the path to the right, retracing your steps until you reach the starting point (S/E).

Waypoints

  1. S/E : km 0 - alt. 1,375 m - End of the Paradis road
  2. 1 : km 2.3 - alt. 1,641 m - Lainvouet chalet
  3. 2 : km 4.41 - alt. 1,849 m - Forclaz Pass
  4. 3 : km 5.2 - alt. 1,903 m - Col de l'Arête (1902m)
  5. 4 : km 6.02 - alt. 2,036 m - Aiguille Verte
  6. 5 : km 7.61 - alt. 1,743 m - Lac de Lessy
  7. 6 : km 7.87 - alt. 1,766 m - Chalets de Lessy
  8. S/E : km 13.18 - alt. 1,375 m - Car park at the start

Worth a visit

For several years, a drop in the lake's water level had been observed, leading to its disappearance. Studies showed that these losses were linked to the presence of two sub-lake outlets. The average leakage flow was 83 m3/h. To preserve Lake Lessy, it was decided to limit the lake's leakage. In 2008, work was carried out to block the outlets with two watertight membranes.

 Always be cautious and plan ahead when you're outdoors. Visorando and the author of this route cannot be held responsible for any accidents occurring on this route.

The GR® and PR® markings are the intellectual property of the Fédération Française de Randonnée Pédestre.

Reviews and comments

4.7 / 5
Based on 23 reviews

Reliability of the description
4.6 / 5
Ease of following the route
4.6 / 5
Route interest
4.9 / 5
Stef74
Stef74

Overall rating : 5 / 5

Date of your route : Sep 20, 2025
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A great alternative to the classic climb via Chinaillon.
Few people and a wide variety of trails (forest, scree, rock, wooded plateau) make the ascent and descent very pleasant.
The final climb up the Aiguille Verte is challenging but the view is magnificent.
A beautiful hike and, in summer, a short stop at the Lessy refuge is very welcome!

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boize
boize

Overall rating : 5 / 5

Date of your route : Jul 29, 2024
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful walk, only one section on the descent could be problematic in wet weather.

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francois.tamburro
francois.tamburro

Overall rating : 5 / 5

Date of your route : Sep 25, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful hike around the lake.
Access to the last part of the Aiguille Verte is tricky.

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Randobriot
Randobriot

Overall rating : 4.7 / 5

Date of your route : Jul 15, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

After the Sous Buclon pass, you can choose the ridge that was the old GR trail. It is less crowded, but there are nettles. On 15 July, there was a crowd trying to get to the green area, especially as goats were occupying the land.

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SE VE RI NE
SE VE RI NE

Overall rating : 5 / 5

Date of your route : Jul 08, 2023
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful trail that climbs up to the Aiguille Verte.
We were alone at the start, but at this time of year the area around the lake is very busy.

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didier burel
didier burel

Overall rating : 4.3 / 5

Date of your route : Oct 05, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

The summit of the Green Needle is at 2,045 metres, not 1,965 metres.

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Deljp
Deljp

Overall rating : 4.3 / 5

Date of your route : Aug 08, 2022
Reliability of the description : ★★★★☆ Good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A small comment regarding the signposting, even though it is off topic. At an altitude of around 1,700 metres, under the cliff, a sign with arrows pointing right and left can be misleading because it is placed too high. At the same level, a poorly marked path branches off to the right (animals, hunters, etc.). Of course, when climbing, you should turn left, even if in the morning, in the shade, the path under the cliff may not be very obvious.
JP

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bg.gaillard
bg.gaillard

Overall rating : 5 / 5

Date of your route : Jul 31, 2022
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

A very beautiful hike, starting at 7:30 a.m. in the cool morning air, alone in the world. The forest section is very pleasant, and crossing the scree at the foot of the cliff looks impressive but is easy to navigate. Arriving at the pass with a view of the lake makes you want to keep going, and the panorama from the Aiguille Verte is magnificent, with a complete view of the Aravis mountain range and Mont Blanc in the background. The landscapes are wonderful, it's the "Yaute" as we like it! The circuit started to get very busy around midday, which is why it's a good idea to set off early. Zero difficulty, maximum enjoyment: to be repeated!

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gazet
gazet

Hello Rhéa25
What you saw were not chamois... We are in the Alps... nor were they mountain goats, but female ibexes and their young. They are often found near the path, either at the top of the scree or when you come out onto the mountain pasture.

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Rhéa25
Rhéa25

Overall rating : 5 / 5

Date of your route : Jun 29, 2022
Reliability of the description : Not used / Not applicable
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

An absolutely splendid hike... magical landscapes and a wide variety of terrain: forest, mountain pastures, scree, lake... We came across a family of chamois in the scree on the way back, they were less than 10 metres away from us!
The climb up to the Aiguille Verte is also enjoyable and worth the detour for the incredible 360° view.
A pleasant route, an easy climb, in short, it's a must-do!

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bebert38
bebert38

Overall rating : 4.7 / 5

Date of your route : Sep 02, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : Yes

A very varied hike; the only slightly difficult section is the scree slope leading up to the plateau and the Col de la Forclaz. The passages under the rock face are superb, and the route is quite challenging. There were lots of people at the lake. A hike well worth doing

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canu.odile@orange.fr
canu.odile@orange.fr

Overall rating : 5 / 5

Date of your route : Aug 15, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : Yes

A beautiful, varied hike with no difficulty. The first part of the route to the Col de la Forclaz is not too busy, but there are lots of people around the lake and at the Aiguille Verte (hike completed on a Sunday). Beautiful views. Thank you to the author of this route.

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jersen
jersen

Overall rating : 4.7 / 5

Date of your route : Jun 27, 2021
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★☆ Good
Route interest : ★★★★★ Very good
Very busy route : No

A beautiful mountain hike for adults and children who are good walkers.
After the forest, there is a steep descent over scree to reach a more undulating plateau towards the Col de la Forclaz.
Magnificent view of the lake. We didn't climb up to the Aiguille Verte because we wanted to enjoy a picnic by the lake.
At the top, there are views of the Glières plateau and Lake Geneva with Geneva in the distance.
You can also see vultures nesting in the cliffs, so bring your binoculars!

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Thierry CLERGET
Thierry CLERGET

Overall rating : 5 / 5

Date of your route : Sep 14, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★★ Very good
Very busy route : No

Very beautiful hike; the only slightly difficult section is the scree slope leading to the plateau and the Col de la Forclaz.

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Lolacat
Lolacat

Overall rating : 4.7 / 5

Date of your route : Aug 10, 2020
Reliability of the description : ★★★★★ Very good
Ease of following the route : ★★★★★ Very good
Route interest : ★★★★☆ Good
Very busy route : Yes

To climb on foot from Petit-Bornand, follow "Cocogne" on the right just before the fitness trail. This will take you above the Paradis car park (allow a good hour for the climb) and then just continue straight ahead following the sign for "Lac de Lessy". A lovely hike with varied landscapes, but very busy (done on a summer Sunday). Aiguille Verte: the last section to the summit is very vertiginous and risky. But the view is just as magnificent from the "mini" summit just before.

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