3. Heidi-Challenge - Etappe3 Tour City Berlin 2026

The Heidi-Challenge is a five-stage ultramarathon in Berlin, scheduled for October, covering 316 km over multiple days rather than a single start-to-finish effort. The race begins in Berlin and is designed for experienced ultra runners seeking a multi-day challenge. The course features rolling terrain, with short ascents interspersed with flat sections. Its stage format distinguishes it from typical one-day races: participants must manage fatigue over several days, not just complete one long run. Berlin offers running events in various formats, but this one is at the demanding end of the local schedule.