The Les Diablerets site has about ten crags including the Naegelihorn and Oldenegg cliffs for moderate to advanced climbers. Given its North aspect, climbing is possible on hot summer days.
The left base of the North face of the Nägelihorn has a fantastic 150-metre high steep slab, adjacent to an overhang. From the Oldenegg mountain hut, go down the valley between La Reille until you get to the slab. Takes about 40-45 minutes.