Barcelona Trail Races guides participants through the trails of Collserola Park, the largest green space within the Barcelona metropolitan area. The primary event is the 77 km Gran Trail Collserola, typically held in mid-November, offering both solo and relay entry options.
The course crosses natural, forested, and mountainous terrain just outside the city, featuring 2,640 metres of elevation gain over its 77 km length. As part of the UTMB Index, it draws trail runners seeking a demanding long-distance challenge while remaining in the Barcelona vicinity.