Stage 18

The 2025 Tour's most challenging stage features a vertical ascent of 5,500 metres. A significant portion of this elevation gain occurs during the ascents to Col du Glandon and Col de la Madeleine, where riders will ascend to 2,000 metres for the first time today. Subsequently, they will climb even higher above Courchevel to reach Col de la Loze, approaching the pass from this side for the first time.

After navigating through the altiport, the final four kilometres unfold on a cycle path, marked by an uneven gradient that rivals the demanding routes of 2020 and 2023.