Trail du Viaduc is a trail race in Trégrom, Côtes-d'Armor, Brittany, offering 8 km and 16 km distances. It takes place in mid-March, organized by the local Trail du Viaduc association, giving the event a village-race atmosphere.
The routes traverse the local countryside, featuring a passage under the viaduct, which lends the race its name. This is the tenth edition of the event, and the two-distance format accommodates runners seeking a short off-road run or a longer rural trail challenge.