The Mont Grêle lookout

The Mont Grêle lookout point and Archelle’s summit.
Mont Grêle is a peak that is visible from the valley of Chambéry and the Aiguebelette region.
It is easily spotted thanks to or because of the pylons that are installed at the top. Up close, these towers have still look great, but they do not alone justify the purpose of the tour, which is interesting because it offers views over Lake Aiguebelette and Chartreuse.

Technical sheet
No. 4098424
A Attignat-Oncin walk posted on 27/12/12 by visorando. Update : 04/09/19
Calculated time Calculated time: 6h35[?]
Distance Distance : 14.38km
Vertical gain Vertical gain : 870m
Vertical drop Vertical drop : 870m
Highest point Highest point : 1425m
Lowest point Lowest point : 603m
Moderate Difficulty : Moderate
Back to starting point Back to starting point : Yes
Walking Walking
Areas Areas : Jura mountains, Alps
Location Location : Attignat-Oncin (73610)
Starting point Starting point : N 45.506381° / E 5.777608°
Download : -


Head to the commune of Attignat-Oncin and park in the cemetery car park (S).
From the car park go up the asphalt road to the hamlet of La Fauchère, cross though and reach the reservoirs (1) visible from above the hamlet.
Take the path, marked by a wooden sign, that rises sharply to the Rousse climbing 960 m in 45 minutes.
Cross the track and take the path slightly above (2). Always following the yellow signs, take the trail slopes in segments to reach 1360 m altitude at the “Sommet de l’Archelle" in 1 hour 45 minutes from the start and a 750 m drop (3).
As the viewpoint has disappeared, head north by the ridge trail to the Mont Grêle lookout point (1410 m), this 1.8 km trail has had 1/3 of its length gouged out by logging traffic. (4) The lookout point can be reached in 40 minutes and there is some information explaining the formation of the Épine massif and Aiguebelette lake, a nice view over Chartreuse and the two lakes.
Return to Archelle (3), and then pass through grazing fallow land and enjoy the views of the Chartreuse mountains especially Grand Som and Petit Som that can be seen nearby.
The downhill trail (5) the Chemin de la Pissoire is well marked, it indicates a two hour walk and Attignat-Oncin 5.9 km away by foot.
This grassy path quickly becomes a more difficult, furrowed at one part and gouged by 4x4 vehicles at another..
At 1170 m of altitude, “Chemin de la Pissoire" heads in the direction of the Pissoire falls (6). It's a steep and slippery path that will follow and cross the Pissoire stream at a small waterfall.
Reach a forest road (7), leaving it three loops in the road later (8) to rejoin first the trail and then the path, both following the course of the Pissoire stream, leading to Gerbezet (9) (630 m). From there, follow the GR9 following the first road and a path that goes along and across meadows. It will cross the Merderet stream (10) and, soon after, reach a small road down the left (11), then take the higher road right (12) to the village and car park (F).

Waypoints :
D/A : km 0 - alt. 619m
1 : km 0.95 - alt. 741m - The Fauchère reservoir
2 : km 1.85 - alt. 963m - Cross and head up the path
3 : km 3.7 - alt. 1361m - L'Arcelle
4 : km 5.25 - alt. 1419m - Mont Grelle (1425m)
5 : km 6.01 - alt. 1365m - Lookout point
6 : km 8.73 - alt. 1310m - Chemin de la Pissoire
7 : km 9.83 - alt. 1175m - In the direction of the Pissoire falls
8 : km 11.53 - alt. 829m - The path along the Pissoire stream
9 : km 12.83 - alt. 619m - Gerbezet
10 : km 13.66 - alt. 608m - Take the road to the right
D/A : km 14.38 - alt. 618m

Useful Information

The high points of this hike can also be reached via:
Aiguebelette, la Bauche, Saint Thibault de Couz and Simons hamlet, Saint Sulpice and the Michetons hamlet, following the trail that leads up to the Saint Michel pass.
Walking shoes required.

Visorando and this author cannot be held responsible in the case of accidents or problems occuring on this walk.

During the walk or to do/see around

Aiguebelette lake.

Opinions and comments


Global average : 4/5
Number of opinions : 2
Description quality : 4.5/5
Routemap quality : 4/5
Walk interest : 3.5/5

on Fri 27 Sep 2019 09:44:01 CEST

Global average : 4 / 5

Date of walk : 21/09/19
Description quality : Very good
Routemap quality : Good
Walk interest : Average

The circuit around Mont Grêle starts by a continuous ascent of 750m up to the first view point. Mainly in the forest, this ascent lacks other viewpoints and does not alternate with descents. It is not as satisfactory as it could be. Then, close to the top, the landscape changes, you can see rocks, other trees and then a beautiful panorama over Aiguebelette lake and the surrounding area.
We were 20 people and some of us were tired, we stopped at the first viewpoint and then went to the right towards La Pissoire. The route back was easier, not so steep, the forest a bit more clear and you could see more things on the way. The waterfall is lovely, tall, definitely worth a visit.
Then DO FOLLOW the trail close to the water stream, otherwise you're tempted to follow the asphalt road which is a long descent that adds fatigue to your knees and feet.
All in all a nice walk, too bad we did not go all the way to the top of the mountain. Trekking poles might help.

on Tue 06 Aug 2019 09:16:56 CEST

Global average : 4 / 5

Date of walk : 01/08/19
Description quality : Good
Routemap quality : Good
Walk interest : Good

A wonderful walk that takes you to the top of the Mont Grêle, where you are rewarded with a magnificent view over the area. The description and routemap are clear, and the walk took us about 6 hours in total (and we are not really experienced, we just did the walk on sneakers).

Other walks in the area

Accommodation, Restaurant
distance 17.77km Vertical gain +1639m Vertical drop -1639m Durée 9h45 Difficult Difficult
Starting point Starting point in Saint-Christophe-sur-Guiers - 38 - Isère

Petit Som and Grand Som from Gîte à Rucher de la Ruchère.

Accommodation, Restaurant
distance 4.88km Vertical gain +176m Vertical drop -177m Durée 1h55 Easy Easy
Starting point Starting point in Chambéry - 73 - Savoie

Peri-urban circuit to quickly escape the city. Views of Chartreuse and Bauges.

distance 7.94km Vertical gain +832m Vertical drop -826m Durée 4h40 Moderate Moderate
Starting point Starting point in Saint-Bernard (Isère) - 38 - Isère

The "Passage de l'Aulp du Seuil" ("Aulp du Seuil" passing): this hike is one of the most beautiful hikes of the Chartreuse massif.

Accommodation, Restaurant
Tour of Lake Paladru
distance 17.88km Vertical gain +449m Vertical drop -447m Durée 6h25 Moderate Moderate
Starting point Starting point in Charavines - 38 - Isère

A day's walk, quite lovely and varied. You start by going through the Grand Platon Forest, then going along the south-east bank of the lake with beautiful views over the lake. You change banks and go along the Feydelière and Véronnière marshes ('Marais' - protected sites). The return is via the north-west bank of the lake with beautiful views over Chartreuse and, if the weather is clear, Mont Blanc.

Accommodation, Restaurant
distance 9.94km Vertical gain +284m Vertical drop -292m Durée 3h40 Easy Easy
Starting point Starting point in Les Déserts - 73 - Savoie

A circuit from Féclaz to the Nivolet Cross overlooking Chambéry.

Accommodation, Restaurant
distance 4.69km Vertical gain +332m Vertical drop -323m Durée 2h15 Moderate Moderate
Starting point Starting point in Saint-Pancrasse - 38 - Isère

Short family-friendly walk with a magnificent view, manageable on foot or on snowshoes.

Between Brangues and the Rhône
distance 15.28km Vertical gain +76m Vertical drop -77m Durée 4h35 Easy Easy
Starting point Starting point in Brangues - 38 - Isère

A lovely, gentle walk, part of which is along the Rhone, which you can do as a family.

Accommodation, Restaurant
distance 10.71km Vertical gain +339m Vertical drop -340m Durée 4h00 Moderate Moderate
Starting point Starting point in Montaud (Isère) - 38 - Isère

Easy walk on this “tooth” overlooking the Isère valley and offering an interesting view over the east foothills of Chartreuse.

For more walks, use our search engine.

The GPS track and description are the property of the author.