4.6
(149)
10,785
riders
21
rides
Road cycling routes around Lac de Grand'Maison are situated in the Isère region of France, characterized by its Alpine landscapes and significant elevation changes. The area features the artificial Lac de Grand'Maison, formed by a large dam, which sits at 1698 meters. This location provides access to challenging climbs, including the renowned Col de la Croix de Fer and Col du Glandon, with roads that offer both demanding ascents and sections with panoramic views. The terrain includes high mountain passes and a relatively flat reservoir section, providing varied cycling experiences.
Last updated: July 1, 2026
5.0
(5)
147
riders
52.0km
03:25
1,600m
1,600m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.
37
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.

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166
riders
59.3km
03:57
1,890m
1,890m
Hard road ride. Very good fitness required. You may need to push your bike for some segments of this route.
5.0
(1)
60
riders
22.9km
01:40
860m
860m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
5.0
(4)
192
riders
19.7km
01:19
640m
640m
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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Beautiful church and small water spot.
2
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Grandiose ascent on the D110, great view at the pass.
2
0
Great road and wonderful views.
2
0
Nice little place with restaurant, church and the Lacets de Montvernier. Further ascent possible.
2
0
Fantastic ascent, great views,
2
0
Every cemetery has water... Drinkable or not 😂
0
0
The descent from the Col du Glandon towards the north offers a striking view towards the valley, the Col de la Madeleine and the Mont Blanc massif.
0
0
There are over 25 road cycling routes around Lac de Grand'Maison, offering a variety of experiences from moderate loops to challenging high-altitude ascents. These routes are highly rated by the komoot community.
The road cycling routes around Lac de Grand'Maison cater to various skill levels. You'll find 4 easy routes, 10 moderate routes, and 11 difficult routes, ensuring options for both casual riders and experienced climbers.
Road cycling around Lac de Grand'Maison offers breathtaking Alpine landscapes. You'll encounter panoramic mountain views of peaks like the Aiguilles de l'Argentière and Rocher Blanc, the impressive Grand'Maison Dam and reservoir, and potentially other natural features like Lac de l'Ane or the waterfall from the stream of Petite Lauze.
Absolutely. The area is renowned for its challenging climbs, including the legendary Col de la Croix de Fer and Col du Glandon, which are frequently featured in major cycling events. The climb to Col du Sabot is also a tough ascent with an average slope of 8.9% over 14.5 km, offering significant elevation gain and rewarding landscapes.
Yes, while the region is known for its challenging climbs, there are also moderate options. For example, the Chalet at Col du Glandon – Col de la Croix de Fer (Iron Cross Pass) loop from Le Rieu Claret is a moderate 26.2 km route connecting two iconic passes. The reservoir itself also offers relatively flatter sections for a brief reprieve amidst the mountainous terrain.
The road cycling routes around Lac de Grand'Maison are highly regarded by the komoot community, with an average rating of 4.6 stars from over 70 reviews. Cyclists often praise the stunning Alpine landscapes, the challenge of the iconic climbs, and the varied terrain that offers both demanding ascents and scenic, less steep sections.
Yes, many routes around Lac de Grand'Maison are designed as loops. For instance, the Montvernier – Lacets de Montvernier loop from Col du Glandon is a difficult 59.7 km circular path, and the Mollard Pass – Col du Mollard loop from Col du Glandon is another popular 47.9 km loop through high mountain passes.
While many routes involve significant climbs, the area around the reservoir itself offers some less steep sections that might be more suitable for families or those seeking a gentler ride. However, specific dedicated family-friendly road cycling routes are limited due to the predominantly mountainous terrain. Always check the route's difficulty and elevation profile before setting out with family.
The best time for road cycling around Lac de Grand'Maison is typically during the warmer months, from late spring to early autumn (roughly June to September), when the high mountain passes are clear of snow and the weather is most favorable. Always check local weather and road conditions, especially for high-altitude passes, as they can change rapidly.
Yes, some routes in the broader region can offer glimpses of Mont Blanc on clear days. For example, the View of Mont Blanc – Great cafe at the Col de Glandon🤩 loop from Saint-Jean-d'Arves is a shorter, difficult route that specifically highlights a view of Mont Blanc.
Parking availability can vary depending on your starting point. Many routes begin from or pass through villages and cols like Col du Glandon or Le Rieu Claret, where you may find designated parking areas. It's advisable to check specific route details or local information for the most convenient parking options near your chosen starting point.
Yes, routes often pass through or near cols and villages where cafes and refreshment stops can be found. For instance, the View of Mont Blanc – Great cafe at the Col de Glandon🤩 loop from Saint-Jean-d'Arves specifically mentions a cafe at Col du Glandon. It's always a good idea to plan your stops in advance, especially on longer or more remote routes.


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