The Duathlon de Carcassonne is a road duathlon held in early March in Carcassonne, located in the Aude department of Occitanie in southern France. It features short run-bike-run formats. The S race, the most popular option, consists of a 5 km road run, a 20 km road bike leg, and a final 2.5 km road run. The XS race shortens these distances to 2.5 km, 10 km, and 1.25 km, respectively.
The event offers children’s and junior courses, making it suitable for families and for athletes seeking a compact multisport race. Post-race, participants can easily access nearby Carcassonne landmarks, including the medieval walled city, the streets of the bastide Saint-Louis, and local cuisine like cassoulet.