Croix de Cassini Loop from Col de Sarenne

The trail typically starts from the Col de Sarenne. You'll find parking available directly at the Col, making it convenient to begin your hike.

Dogs are generally allowed on a leash on this trail. However, be aware that some sections are described as 'aerial' with 'tricky passages' and may require scrambling. These parts are not recommended for dogs, so consider your dog's agility and comfort with exposed terrain before bringing them.

The best time to hike this high-altitude loop is typically during the summer months, from late June to early September, when the snow has melted and weather conditions are most stable. Always check local weather forecasts before heading out.

No, you do not need a permit or have to pay an entrance fee to hike the La Croix de Cassini loop from the Col de Sarenne.

The terrain is varied, primarily following a ridge. You'll encounter rocky sections and narrow passages, with some parts described as 'aerial' and potentially requiring the use of hands for progression. There are scrambling sections, some of which might be secured with fixed ropes. An alternative, safer route via Col Grange Pellorce is available for those preferring less exposure.

From the summit of Croix de Cassini, you'll be treated to spectacular 360-degree panoramic views. These include the Grandes Rousses, Aiguilles d'Arves, Taillefer, La Meije, and Le Râteau. You'll also get unique insights into the glacial landscape of the Écrins massif and may spot local wildlife.

Yes, the Croix de Cassini itself is historically significant. It is named after César-François Cassini, an 18th-century geographer who used this summit in 1739 for his measurements to map the kingdom of France. This connection adds a unique historical layer to your hike.

If you're looking for a less challenging ascent, consider taking an alternative route. Instead of the direct ridge path, descend slightly from the Col de Sarenne towards Alpe d'Huez and then take the path via Col Grange Pellorce. This route is longer but considered much safer, avoiding the more exposed and tricky sections of the direct ridge.

Yes, the route also passes through sections of the Route des Grandes Alpes à vélo, variante L'Alpe d'Huez / Briançon and the Tour de l'Oisans et Écrins.

Lucky hikers might spot local wildlife such as marmots, lammergeiers (bearded vultures), or chamois, especially in the wilder mountain sections of the trail.

While the Col de Sarenne itself is a more remote starting point, you can find cafes and accommodation options in the nearby Alpe d'Huez area, which is accessible from the Col.