Vieux Émosson Dinosaur Footprints Trail

The ideal time to run this loop is from mid-July through early autumn. Snow can persist on the trail until mid-July, which can make certain sections challenging or impassable. Visiting after the snowmelt also allows you to see the ancient dinosaur footprints.

The starting point is typically near the Emosson Dam. You can drive and park there, or for a unique experience, consider taking the spectacular VerticAlp Emosson railway trio (funicular, panoramic train, and mini-funicular) which provides scenic access, though it's worth checking their operational status.

The terrain is quite varied and challenging. You'll encounter mountain paths with rocky sections, some of which are technical and may require using your hands for stability, with certain parts secured by metal chains. While some sections might be paved, expect mostly rugged, natural surfaces. Snow can linger until mid-July.

The complete loop, especially if it includes the geological hike, is generally considered 'difficult' due to its length, elevation gain, and technical rocky sections. A shorter, dedicated trail running loop around both Lac Emosson and Lac Vieux Emosson is rated 'moderate' in technical difficulty. Good fitness and sure-footedness are essential. Easier alternatives exist by sticking to paved paths or bypassing the more strenuous gorge sections.

There are no specific permits or entrance fees required to access the trail running loop itself. However, if you choose to use the VerticAlp Emosson railway for access, there will be a fee for that service.

You'll be treated to spectacular alpine panoramas, including impressive views of the Mont Blanc massif. Key features include the massive Lac d'Émosson and the older Lac du Vieux Émosson, both with their dramatic dams. A highlight is the 240-million-year-old fossilized dinosaur footprints visible at the southern end of Vallon du Vieux-Emosson, typically from mid-July. You can also find amenities like the Cabane du Vieux Emosson and the Restaurant du Barrage de Emosson.

While specific rules for dogs on this particular trail are not explicitly stated, it is generally recommended that dogs on mountain trails are kept on a leash, especially in areas with wildlife or other hikers. Always ensure your dog is well-behaved and that you clean up after them.

The complete loop, which is about 12.2 km with 858m of elevation gain, is rated as 'difficult' and could take experienced trail runners around 1 hour 30 minutes to 2 hours. A shorter, dedicated trail running loop (9.6 km, 486m/507m elevation) is estimated to take 60 to 90 minutes. Your actual time will depend on your fitness level and how often you stop to enjoy the views.

Yes, sections of this route overlap with other established trails. You will find it intersects with parts of the Tour de la Vallée du Trient, Chalet de Loriaz, 38-Alpine Passes Trail, 37-Alpine Passes Trail, and Traces des dinosaures-Col de la Terrasse.

Yes, there are a couple of options for refreshments. You can find the Cabane du Vieux Emosson and the Restaurant du Barrage de Emosson along the route, offering opportunities for meals and drinks.

To fully appreciate the unique geological features, plan your run for mid-July or later. This ensures the snow has melted, making the dinosaur footprints visible and the more technical sections of the trail, like the wild Veudale Gorge, more accessible and safer to navigate.