The NAC Trail 2026 is a trail running event scheduled for September 27, 2026, in Oliveira de Azeméis, Portugal. The start and finish lines are located at Parque Urbano de Cavaleiros, Santiago de Riba Ul. The event features three options: a competitive 17 km Trail Sprint, an approximately 10 km Mini Trail, and a 10 km non-competitive walk. Participants must be at least 18 years old for the Trail Sprint and Mini Trail. There is no age restriction for the walk. The Trail Sprint is part of the 1st District Trail Running Circuit of the Aveiro Athletics Association. The courses utilize trails and paths, incorporating river crossings and challenging natural terrain with considerable elevation gain. The event offers both competitive and non-competitive choices, aiming to be inclusive for trail running and walking enthusiasts.