I'm planning to spend the night far above the tree line at Diablerets around the Oldenhorn with a friend. We'd be taking a tent and gear, and a small cooking stove. We plan on being discreet and all, but does anyone know if this is legal? We wouldn't be near any huts or gondola checkpoints, just high up near the peak, to the left of the Diablerets glacier. Does anyone have any experience with wild camping in this area?
"Wild camping is not allowed in the valleys, inhabited areas and forests. Regulations are set by local authorities, so exceptions may apply here and there, but it's best to assume that it's not allowed. You'd better book a camp site. It's never allowed in wildlife sanctuaries and conservation areas.
In the mountains, above the tree line, wild camping is basically allowed, apart from conservation areas. This applies for one night only, with a limited number of people, and if you don't make noise and leave no waste. Also it is important that you know how to stay safe from rock falls, flooding and storms. Additional regulations apply, so be sure to read the Swiss Alpine Club recommendations."
Part of the allowances for wild camping is that you need be "going somewhere" - in other words, not hanging out at the same camp for 2-3 nights. You're hiking from A -> B, and can't make it in one day so you're allowed to overnight along the way.
For those who read french, here's a fantastic account of a 27 day high altitude walking/camping tour around the Valais, including Les Diablerets. He was careful and was never bothered by farmers or authorities.