13th Schloss Marienburg Marathon

The 13. Schloss Marienburg Marathon takes place on 21 November 2026 in Nordstemmen‑Adensen and is organised by VfL Adensen‑Hallerburg. The event offers multiple formats on the same day including a marathon, the REWE‑Halbmarathon (21.1 km), a 4×10.55 km relay (Staffel) and a 21.1 km walking option. Participation is capped and entries are by online registration only, with bib collection on race morning; the organiser publishes results and certificates online from the day after the race. The official event website and the race regulations (Ausschreibung) carry the full entry conditions and cut‑off rules.

The course is a hilly figure‑of‑eight loop that uses village roads, asphalted and unpaved field paths, forest trails and a notable climb to Schloss Marienburg, with aid stations (including a refreshment point at the castle courtyard) and DRK medical cover on course. There is an early start option at 09:00 for runners who require more than six hours, while the standard starts are at 10:00; the organiser specifies intermediate cut‑offs along the route. Facilities at the start/finish include changing rooms, secure baggage storage, showers and toilets; all finishers receive a medal and prize awards are provided to top finishers in the marathon and half marathon.