Grillenburg Backyard Ultra Marathon presents an intense endurance challenge set amidst the serene Tharandter Forest near Grillenburg, Germany. Organized by SC Freital e.V., this unique race begins on August 15, 2026, at 10:00 AM and continues hourly until only one participant remains. The event unfolds in a picturesque setting within the Jugendfreizeithof Grillenburg grounds, offering runners stunning views of nature while they navigate its challenging terrain. Participants will primarily run through winding forest paths that wind around Seerenteichstraße 11, Tharandt OT Grillenburg. The course layout is announced well before race day on SC Freital's website. The competition adheres to the international rules of a Backyard Ultra Marathon format: every hour, runners must complete one lap within an hour or drop out. Each loop measures approximately six miles and takes place either clockwise during daylight hours (from 6 AM) or counterclockwise at night (after 6 PM). Competitors are required to start each new loop on time; otherwise, they're disqualified. To ensure safety and fairness, the event has strict rules against shortcuts and outside assistance. Runners must carry their own gear and collect any waste produced during runs. Night runners should bring a flashlight or headlamp from 9:00 PM until dawn. Accommodation is available on-site with shared rooms at Grillenburg Youth Hostel for €20 per night, including breakfast options priced separately (€5 each). Early arrival is recommended; participants can enjoy meals and snacks provided by the organizers starting August 14th. Registration fees vary depending on when they are paid: up to January 31st, 2026 - €79; April 30th, 2026 - €89; May 1st onwards - €99. All participants receive a starter kit with a numbered chip for tracking purposes. The event's atmosphere is both competitive and supportive as runners push their limits against nature’s backdrop. The final victor receives a trophy while all others are awarded DNF medals, celebrating perseverance regardless of outcome. This unique blend of endurance running combined with the natural beauty of Tharandter Forest makes Grillenburg Backyard Ultra Marathon an unforgettable experience for serious athletes looking to test themselves in one of Europe's most distinctive races.