Germany's largest trail running festival, set around the Zugspitze massif in the Bavarian Alps. Founded in 2011 in Grainau, the event grew to multiple distances and joined the UTMB World Series in 2024. The 2025 edition introduced a new 100-mile race (ZUT100) circling the Zugspitze, cementing the festival as one of the premier ultra events in the German-speaking Alps.