You can either start from the landing of Perroix (1100 m of elevation gain), or start from Planfait's takeoff (700 meters of elevation gain). Once you get to the take-off keep going on a logging road. When you arrive at a large beech tree bearing several wooden signposts: follow the direction of the Col des Frêtes, and start a steep ascent in the forest. Once you go out from the forest, the path gets quite steep on grassy slopes as you arrive below the Dents de Lanfon. Please note that this final part to reach the Col becomes very muddy and slippery in case of rain/wet conditions. At the top, you can enjoy a breathtaking view of the lake, the Dents de Lanfon and the surrounding area. The take-off is south-west