The STUT-Santo Thyrso Ultra Trilhos 2026 is a trail running event taking place on February 14 and 15, 2026, in Santo Tirso, Portugal. It features multiple race distances catering to a range of participants: Ultra (44 km), Long (32 km), Short (17 km), and a 10 km Walk. There is also a dedicated Kids Trail event on February 14 with distances tailored for children aged 5 to 17 years.

The event is open to all runners, with minimum age limits depending on the race distance, and it promotes fair play and respect for the environment. The race courses traverse the scenic trails, forest paths, and rural roads around Santo Tirso and Paços de Ferreira, offering a beautiful and varied terrain for runners.

The atmosphere is inclusive and family-friendly, with special events for children and a non-competitive moderate difficulty walk alongside the competitive races. Awards are given for individual age groups and teams, and the event emphasizes safety and environmental responsibility.