4.3
(5)
28
hikers
2
hikes
Mountaineering routes around Attignat-Oncin are situated in a mountainous region, characterized by significant elevation changes and varied terrain. The area features prominent peaks and passes, offering challenging ascents and panoramic views. These routes often traverse through natural parklands, providing a mix of forested sections and open mountain landscapes. The region's geography makes it suitable for experienced mountaineers seeking demanding trails.
Last updated: May 8, 2026
5.0
(2)
9
hikers
9.43km
03:39
480m
480m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
6
hikers
20.1km
08:01
1,210m
1,210m
Hard mountaineering route. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

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4
hikers
7.29km
02:58
410m
410m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
5.0
(1)
3
hikers
9.00km
03:36
610m
610m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
2
hikers
6.84km
02:17
330m
340m
Moderate mountaineering route. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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Caution: This section involves a semi-stop and traverse along a cliff face without a handrail. Not recommended for people prone to vertigo or for children.
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Warning: The climb from the east side is extremely steep! An average gradient of around 10% over 9-10 km.
1
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Very beautiful view of the 2 lakes 👌
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Very good and quite accessible as a pass. Be careful of overtaking cars.
1
2
From Saint Pierre you pass through Entrement le veux and arrive at the top of Col de Granier, if you take the first right towards Col de Marcieu until Saint Hillaire de Touvet and descend into the valley to Grenoble, very calm, rolling and bucolic
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Done today, lots of snow at the top, the climbing sections are dry and the descent too
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Magnificent summit above the Col de la Ruchère, offering you one of the most beautiful panoramas of the Chartreuse.
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The mountaineering routes around Attignat-Oncin are primarily designed for experienced mountaineers. Most of the trails are classified as difficult, featuring significant elevation changes and challenging terrain. There is one moderate option, the Tracol loop from Chartreuse Regional Nature Park, which offers a slightly less demanding experience.
The routes vary significantly in length and ascent. You can find shorter, challenging loops like the Pointe de la Gorgeat – Mont Joigny loop from Col du Granier, which covers 7.2 km with over 400 meters of elevation gain. For a longer, more strenuous adventure, the Belvedere Montgrelle – Electric pole lookout loop from Lépin-le-Lac spans nearly 20 km with over 1200 meters of ascent.
Yes, several mountaineering routes around Attignat-Oncin are circular, allowing you to start and end at the same point. Examples include the Mount Outheran - 1686 m loop from Le Désert d'Entremont, the Ruchère Pass – Petit Som loop from Chartreuse Regional Nature Park, and the Tracol loop from Chartreuse Regional Nature Park.
The mountainous terrain around Attignat-Oncin is best explored during the warmer months, typically from late spring to early autumn. During this period, trails are generally clear of snow, and weather conditions are more stable, offering better visibility and safer passage through the high-altitude sections and passes.
Absolutely. The region is known for its panoramic views. Many routes offer expansive vistas, such as those found on the Belvedere Montgrelle – Electric pole lookout loop from Lépin-le-Lac. You can also visit specific highlights like the Étincelle Viewpoint or the Mont Grêle Viewpoint for stunning mountain scenery.
The mountaineering routes in Attignat-Oncin are highly rated by the komoot community, with an average score of 4.0 stars. Reviewers often praise the challenging ascents, the rewarding panoramic mountain views, and the diverse landscapes that include both forested sections and open mountain environments.
Yes, the area boasts several natural attractions. You might encounter the serene Lac d'Aiguebelette, the historic Old Saint-Martin Bridge, or the flowing Grenant Stream. The routes also traverse through prominent mountain passes like Épine Pass and Saint-Michel Pass.
While the region is popular for its challenging trails, routes like the Pointe de la Gorgeat – Mont Joigny loop from Col du Granier offer a robust mountaineering experience that might feel more secluded compared to the most popular options. Exploring trails that are not highlighted in the main guide can often lead to quieter discoveries.
The region is characterized by significant peaks and passes that define its mountaineering landscape. Notable summits include Mount Outheran and La Cochette Cross. Key mountain passes like Épine Pass and Saint-Michel Pass are also integral to the area's challenging routes.
Given that most mountaineering routes around Attignat-Oncin are classified as difficult and involve significant elevation changes and varied terrain, they are generally not recommended for families with young children or beginners. These trails are best suited for experienced mountaineers seeking demanding challenges.
There are several mountaineering routes available around Attignat-Oncin, offering a range of challenging experiences. Komoot currently lists 5 distinct routes in this guide, with more options available for exploration in the wider region.


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