Kielder Marathon, Half Marathon & 10K 2026

The Kielder Marathon, Half Marathon & 10K takes place in early October, centered on the 26.2-mile Kielder Marathon. Shorter running distances and a gravel duathlon are also part of the programme. The marathon is promoted as “Britain’s most beautiful marathon,” and the weekend features junior races and spectator areas. Thousands of runners participate in the anniversary editions, including regular entrants and charity runners pursuing personal causes. The marathon is in its 15th year, with recent highlights including charity collaborations, notable guest appearances, and a mother-daughter team running to support research into a rare genetic condition.