The Duathlon des Collines Bleues is a late-winter youth duathlon held in Port-Launay, Finistère, Brittany, near Châteaulin. It features short-format racing across XS, S, and youth categories, focusing on quick run-bike-run segments instead of long-distance endurance. Team Triathlon Châteaulin organizes the event, using Port-Launay as the race hub, with bib collection at École Pierre Perret.
The competition is designed for young male and female athletes, with nearly 300 participants anticipated in recent years. The race is significant as it contributes to youth championship qualifications, including Breton and Finistère youth titles and quarter-final berths for the French Youth Championship. The schedule includes distinct women's XS and S races, aligning younger age groups with shorter distances.