Below is a list of popular passes and their general opening season. Finden Sie die aktuellen Passzustände der Zentralalpenpässe und viele weitere … Check out our opening date and hours of operation here. Albula Pass in Graubünden (May to October/November); Sipapu Ski and Summer Resort hours of operation very throughout the year and season. The map shows current conditions for all passes. Check out our opening date and hours of operation here. Sipapu Ski and Summer Resort hours of operation very throughout the year and season.