San Silvestre de Alcobendas is a New Year's Eve road race held in Alcobendas, a town north of Madrid. The primary event is a 10K race. Additionally, a 5K is offered for novice runners, providing a shorter option to participate in the year-end running tradition.
The race receives support from the Alcobendas City Council and its Municipal Sports Board. The eighteenth edition introduced the 5K for beginners. The 10K remains the main event, featuring separate classifications for women and men. The race also provides start and finish videos, allowing participants to review their times and share their finish-line experiences.