The Karwendellauf 52 km Scharnitz-Pertisau is a 52 km trail race in Austria. It starts in Scharnitz and runs toward Pertisau, crossing the Karwendel area. The event takes place in August, a month typically with warm, often sunny, and generally drier weather than July. Average temperatures range from highs near 25°C to lows around 14°C.
The course features 2,281 metres of elevation gain. It commences in Scharnitz, proceeding over the Schafstallbod. This is a long mountain trail run, not a road race, with a participant cap of 2,500. The event spans from early morning until evening.