Col de l'Iseran: South Climb from Val Cenis

The south climb officially starts in Lanslebourg-Mont-Cenis, which is part of Val Cenis. You can typically find parking in the villages within Val Cenis, such as Lanslebourg-Mont-Cenis, to begin your ride.

The estimated duration for cycling the south climb of the Col de l'Iseran from Val Cenis is around 4 hours and 2 minutes for the ascent, covering approximately 65 kilometers round trip. This can vary significantly based on your fitness level and how often you stop.

No, this climb is classified as 'difficult' and 'Hors Catégorie' (beyond category), the most challenging rating in professional cycling. It is not recommended for beginner cyclists due to its significant length, elevation gain of over 1,800 meters, and sustained steep gradients, especially above Bonneval-sur-Arc.

The initial 3 km from Lanslebourg-Mont-Cenis are relatively easy, with gradients under 3%. After Lanslevillard, it steepens, including an ascent to the Collet de la Madeleine, followed by a flatter 8 km section through Bessans to Bonneval-sur-Arc. The 'climb proper' begins from Bonneval-sur-Arc, featuring almost 1,000 meters of ascent over 13.5 km with an average gradient of 7.3%, and sections reaching 9% or even 13%. The final two kilometers average 7.5%.

Initially, you'll cycle through green pastures and valleys with traditional chalets. As you ascend past Bonneval-sur-Arc, the landscape transforms into a more 'mineral,' 'desolate, rough and untouched' high-alpine environment. You'll be surrounded by the majestic peaks of the Vanoise National Park, with views of glaciers and snow-capped mountains, often crossing the pass between walls of snow even in summer.

Yes, along the route, you'll pass through charming villages like Bessans and Bonneval-sur-Arc. Notable points include the Col de la Madeleine (a smaller pass before the main climb), the Plaine de Bessans, and the picturesque village of Bonneval-sur-Arc, before reaching the iconic Iseran Pass summit.

The best time to cycle the Col de l'Iseran is typically from late June to early October, once the pass is fully open and clear of snow. Even in summer, be prepared for rapidly changing weather conditions at high altitudes.

No, you do not need special permits or to pay entrance fees to cycle the paved road through the Vanoise National Park to the Col de l'Iseran. However, as you are in a national park, please respect all regulations regarding wildlife, litter, and noise.

While the paved road itself doesn't have specific restrictions for dogs, the route passes through the Vanoise National Park. Within the core zone of the park, dogs are generally not allowed, even on a leash, to protect wildlife. On the main road, it's less restrictive, but always keep your dog under control and be mindful of traffic and other cyclists.

Yes, the route extensively follows sections of the 'Route des Grandes Alpes à vélo, étape 6, Val d'Isère / Val-Cenis' and also intersects with the 'Haute-Mauriennaise' and the 'Col de l'Iseran' official trails.

Given the high altitude and potential for rapidly changing weather, pack layers including a windproof jacket, arm and leg warmers, and gloves. Bring sufficient water and nutrition, as services become sparse higher up. A bike repair kit, spare tubes, and a fully charged phone are also essential. Don't forget sunscreen and sunglasses.