The C.I. 100k - Jersey

The C.I. 100k - Jersey takes place on the Channel Island of Jersey on 22 November 2026, starting from Saint Catherine's. Held at the end of November, at night and in the depths of winter, it can see temperatures drop as low as 7°C. Four formats are on offer: 100 km solo, 50 km solo, or the 100 km as a relay for teams of two or three runners, with 2,700 m of elevation gain over the 100 km.

The course follows the island's north coast through Les Landes, a clifftop area rich in wildlife (rabbits, falcons, owls) and prehistoric remains (flints, an axe, standing stones). It also crosses St Ouen's Bay on the west coast, popular with surfers and dotted with Second World War bunkers, as well as St Brelade's Bay. The route is waymarked, but markers are only provided at decision points, so good prior knowledge of the course is recommended. This demanding race is aimed at experienced runners used to long distances.