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).
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
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Activity: Walking
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Distance: 14.38 km
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Average duration: 7h 25
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Difficulty: Moderate
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Return to departure point: Yes
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Vertical gain: + 1,152 m
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Vertical drop: - 1,154 m
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Highest point: 1,426 m
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Lowest point: 604 m
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Country: France
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Area: Jura mountains
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District: Attignat-Oncin (73610)
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Start/End: N 45.506381° / E 5.777608°
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IGN map(s): Ref. 3232ET, 3333OT, 3333OTR
Photos
Description of the walk
Waypoints
- S/E : km 0 - alt. 616 m - Attignat-Oncin: cemetery car park
- 1 : km 0.95 - alt. 746 m - La Fauchère reservoir
- 2 : km 1.85 - alt. 961 m - Crossing and going up the track
- 3 : km 3.7 - alt. 1,363 m - L'Arcelle
- 4 : km 5.25 - alt. 1,417 m - Mont Grelle (1425m)
- 5 : km 6.01 - alt. 1,275 m - Belvedere
- 6 : km 8.73 - alt. 1,309 m - Chemin de la Pissoire
- 7 : km 9.83 - alt. 1,179 m - Direction La Pissoire
- 8 : km 11.53 - alt. 838 m - Path along La Pissoire
- 9 : km 12.83 - alt. 619 m - Gerbezet
- 10 : km 13.66 - alt. 605 m - Take the road on the right
- S/E : km 14.38 - alt. 615 m - Attignat-Oncin: cemetery car park
Practical 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.
In the nearby area
Aiguebelette lake.
Chambéry.
Reviews and comments
4.4 / 5
4.4 / 5
4.4 / 5

Overall rating : 4 / 5
Date of walk : May 25, 2025
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Busy trail : No
Magnificent walk, especially at the finish where you have a magnificent view.
On the other hand, the track is not easy to follow and you often get it wrong.
Difficult hike, the first part climbs really hard, while on the way down the return path is also very difficult and dangerous at times.
But no regrets, it's really a hike to be done with care, especially on the way down.
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Overall rating : 4 / 5
Date of walk : Apr 10, 2025
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : No
First of all, the directions at the start are not accurate: there is at most 900m of ascent and not 1152m ... From the start, follow your advice to take the route de la Fauchère and not follow the only sign at the bottom which does not indicate the same direction. The ground was dry and therefore very passable. Once I'd arrived at the magnificent viewpoint over Lac d'Aiguebelette, I continued due north along the ridge, descending and ascending towards the pylons; there's a beautiful view of the Alps and Mont Blanc; I made a U-turn and descended the Chemin de la Pissoire. Between 7 and 8, it's not easy because there are a lot of tracks and very few signs, but thanks to the app I was able to quickly correct my error. All in all, this route is interesting in dry weather, when it's hot because the route is often in the forest, for the view from the belvedere and after the pylons. It's a very varied route, going from more or less rough forest roads to pretty wooded paths and ending up crossing hamlets and fields.
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Overall rating : 4.3 / 5
Date of walk : Jun 15, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : No
A beautiful hike (which I would classify as more difficult), done after heavy rain. Lots of water on very steep paths at the start, which is why you need waterproof, well-cramponed hiking boots!
The section between points 6 and 7 is still difficult to walk as it is very wet and muddy.
The view from the summit is superb.
This hike takes place in the heart of the forest, which is perfect for hot weather.
With the GPS, you're closer to 16 km and 900 D+.
Beware of the steep slopes, though, which require very good walkers.
A few inaccuracies at times in the choice of directions to take.
In my opinion, this hike should not be undertaken with young children.
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Overall rating : 5 / 5
Date of walk : May 09, 2024
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : No
Very nice walk, precise directions, easy to find your bearings
We did this walk on 09/05 and the section between points 6 and 7 was impassable. The path was completely damaged by the logging machines and we sank up to our calves in the mud. To be avoided at all costs
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Overall rating : 4.7 / 5
Date of walk : Aug 19, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No
A very beautiful hike be careful during the hunting season which can be very badly signposted.
An incredible view from the top. Access to bridge 5 is currently prohibited due to building work.
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Overall rating : 4 / 5
Date of walk : Aug 13, 2023
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : No
The start above the cemetery is no longer signposted, but with the map it's no problem.
In 8, the yellow-marked path no longer runs alongside the Pissoire, but it is possible to follow the original path by turning right, ignoring the yellow cross on the road. The path along the Pissoire is very pleasant.
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Overall rating : 4.3 / 5
Date of walk : Jul 13, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★☆ Good
Busy trail : No
A very shady walk on the way up, sometimes with a slightly steep slope. A few sections need a bit of attention on the way down, but nothing extraordinary for good walkers. Lovely views. L
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Overall rating : 3.7 / 5
Date of walk : Apr 09, 2023
Reliability of the description : ★★★☆☆ Average
Clarity of route map : ★★★☆☆ Average
Route interest : ★★★★★ Very good
Busy trail : Yes
WARNING: hike to be classed as very difficult!!!!!
First of all, the climb: with gradients regularly between 40 and 50°, it's no walk in the park (and I do hundreds of kilometres of hiking every year, even on extreme routes). I'll complete the information on the climb by adding that it's a red and black trail.
Then the descent: between points 7 and 8, very steep slope, trail width between 1 and 2 feet wide, lots of scree and very slippery trail (impossible to do in wet weather (even slightly)). And if you're unlucky enough to fall, the slopes are very steep and there are no trees, so I'll leave you to imagine the damage...
For your information, the route is 19 km long, measured with a GPS.
Finally, without a GPS or a solid knowledge of topography, the route downhill is very tricky to find.
However, the route is very pleasant and the views magnificent.
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Overall rating : 4.7 / 5
Date of walk : Apr 05, 2023
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★☆ Good
Busy trail : No
Pleasant route (uphill through the forest before arriving at the Belvedere). Nice views of the Aiguebelette and Aix-les-Bains lakes.
Not much point in continuing past the Belvedere (roadworks, electric poles) apart from the view of Belledonne and Mont Blanc.
No difficulty in finding the path at point 7. There may be one or two short passages on the path in the forest after point 7 where you need to be careful.
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Overall rating : 4.3 / 5
Date of walk : May 22, 2021
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★★☆ Good
Route interest : ★★★★★ Very good
Busy trail : No
A loop hike from Aiguebelette Le Lac to the car park just behind the railway line. A long climb through the forest before reaching the relatively flat ridge. Once you reach the Mont Grêle viewpoint, you'll have an incredible view of Lac d'Aiguebelette and even part of Lac du Bourget! We headed back down towards the Signal to complete the loop. It was a long hike of 17km and 1150m D+ for us.
https://hikesandtravels.com/aiguebelette...
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Overall rating : 3.7 / 5
Date of walk : Jan 31, 2001
Reliability of the description : ★★★★☆ Good
Clarity of route map : ★★★☆☆ Average
Route interest : ★★★★☆ Good
Busy trail : No
Walk completed on 11/02/2023.
We set off from the Attignat-Oncin cemetery car park. It took us 2 hours 40 minutes to complete this difficult climb for non-athletes.
Very good views over Lac d'Aiguebelette, with glimpses of Lac du Bourget and Mont du Chat.
Unfortunately we had quite a bit of fog, so the view was a little less impressive.
From point 3 onwards, the summit is flat until point 5, so you can take a rest.
From point 7 onwards, we had quite a few problems following the signs.
In view of the current snow and ice conditions, we advise against descending between points 7 and 9. The path is very rough and slippery.
We decided to skip point 9 and go straight from point 8 to 10.
However, even though we took a tarmac path, the road was very slippery and we fell.
This is still a very nice spot and we highly recommend it outside the winter period.
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Overall rating : 4.3 / 5
Date of walk : Aug 31, 2022
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★☆☆ Average
Busy trail : No
Walked on 01/09/2022, from the Attignat-Oncin school car park: time taken to climb: 1H20. No problems with orientation as the path is clearly visible and the markings are regular. On the other hand, it's true that it's not very interesting because of the forest, but the viewpoint(s) at the summit are unforgettable!!!! On the other hand, the descent (on the same path as the outward journey), after the rain, proved to be a bit tricky, requiring poles and care, as slipping can happen very quickly........ and can be prolonged due to the steepness of the slope. I was a little short of time, but I think it's better to follow the planned route (or, perhaps, come back via Aiguebellette).
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Overall rating : 4.7 / 5
Date of walk : Aug 20, 2021
Reliability of the description : ★★★★★ Very good
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★☆ Good
Busy trail : No
A great idea for a hike with a superb view of Lac d'Aiguebelette and Lac du Bourget. Thank you very much.
In view of the previous comments, I went back down the way I came. Thank you for the comments that alerted me to this problem. I can confirm that there is no network.
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Isabelle94
before you set off, download the map of the route onto your smartphone (via the function on the app) so that you are not dependent on a lack of network.
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Overall rating : 4.3 / 5
Date of walk : Aug 11, 2021
Reliability of the description : ★★★☆☆ Average
Clarity of route map : ★★★★★ Very good
Route interest : ★★★★★ Very good
Busy trail : Yes
A beautiful hike with magnificent views.
However, the finish at Mont Belvédère du Mont Grêle is a kilometre earlier.
From point 6 to point 7, the path had been changed and all the walking markers had disappeared.
We also made a mistake at point 7, as it was impossible to find the path indicated in the description, but we soon found the way back to point 8.
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