Best mountain passes around Theys are situated in the Isère department of southeastern France, within the Belledonne mountain range. This region is part of the Les Sept Laux winter sports resort. The area offers access to several mountain passes, popular for both challenging cycling routes and scenic hiking trails. The Belledonne range features numerous passes, providing diverse outdoor experiences.
Last updated: June 26, 2026
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The cross of the Aulp du seuil is located at 1825m above the cirque and marks the entrance to the high plateaus.
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Exceptional site at the foot of the Dent de Crolle with access via a wild forest road
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Climb to the Col du Barioz via Les Fontaines and Le Charpieux. A technical climb after Les Perrins requires vigilance and some pushing. Please note: Passage after Les Perrins may be blocked during the summer by an electric sheep fence.
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Beautiful rock formation. Here is one of the steepest sections
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Great hike! Make sure you have good shoes with crampons because some slopes are a bit slippery. Magnificent view at the top.
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Perched at 1,434 meters, the Col du Coq is accessible after a twelve-kilometer climb regardless of the direction of the road taken. It offers a beautiful view of the Dent de Crolles.
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on private property, with no-entry signs, especially at hunting time
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For breathtaking scenic drives and challenging cycling routes, consider the Col de la Croix de Fer and the Col du Glandon. Both are renowned for their panoramic Alpine views, often featuring in the Tour de France, and offer a rewarding experience for road cyclists.
Within the Belledonne massif, the Not of the eye provides access to the top of the Dent de Crolles, offering a unique hike to the summit plateau. The Pas de la Coche is another significant hiking pass, forming part of the GR®738 Haute Traversée Belledonne trail, known for its wild landscapes and high-altitude lakes.
Absolutely. For hikers, the Col de la Vache (Vache Pass), located at 2,535 meters, is a wild and rugged place offering superb views but requires sure footing due to rocks and snowfields. Cyclists will find the Col du Glandon particularly challenging, especially the ascent from La Chambre with sections exceeding 10% gradient.
Many passes offer stunning vistas. From Bellefont Pass, you can enjoy a breathtaking view of Mont Blanc and the highest peaks of the Chartreuse massif. The Col du Coq also provides a magnificent view of the Dent de Crolles. The Col de la Croix de Fer offers panoramic views of surrounding Alpine peaks, including the Aiguilles d'Arves.
The high mountain passes accessible by road, such as the Col du Glandon, are typically closed from early November to mid-May due to snow. For hiking and cycling, late spring through early autumn (June to October) generally offers the most favorable weather conditions, with clear paths and open roads.
While many high passes are challenging, the region offers diverse options. For easier exploration, consider routes on the Balcons de Belledonne plateau, which offer views over the Grésivaudan valley. When planning, look for routes described as 'intermediate' or 'easy' on komoot, and always check current conditions.
Beyond hiking and road cycling, the area around Theys is excellent for gravel biking and mountain biking. You can find various routes, including challenging loops like the 'Crêt du Poulet Refuge – The Grand Rock loop' for MTB, or 'Flat gravel path – Gravel Isere loop' for gravel biking. Explore more options in the Gravel biking around Theys or MTB Trails around Theys guides.
Yes, there are several running trails available. For example, you can find routes like the 'Col des Ayes (944 m) loop from Theys' or the 'Lac de Crêvecœur – Lac de Séchident loop from Col de Barioz'. These trails offer varying difficulties for runners. More details can be found in the Running Trails around Theys guide.
Visitors frequently praise the stunning panoramic views, the challenging yet rewarding ascents for cyclists, and the wild, rugged beauty of the hiking trails. The sense of accomplishment after conquering a pass and the immersion in the natural Alpine environment are often highlighted in community tips.
Yes, the Pas de la Coche is a significant point within the Belledonne range and is part of the GR®738 Haute Traversée Belledonne, a spectacular 130 km trail across the massif. This offers hikers an opportunity to experience a longer, multi-day adventure.
The Col de la Croix de Fer and Col du Glandon hold historical significance in professional cycling, being frequent stages in the Tour de France. Additionally, the Col du Merdaret has a historical narrative linked to a glacial lake catastrophe, adding a unique layer to its natural beauty.


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