South Texas International Marathon

Get ready for an unforgettable running experience at the South Texas International Marathon, taking place on Sunday, December 7th, 2025, in the vibrant city of Mercedes, Hidalgo! This exciting event will feature a full marathon, along with two-person and five-person relays, making it perfect for both solo runners and teams looking to challenge themselves together. Whether you're a seasoned marathoner or a first-time participant, the scenic course and lively atmosphere promise to create lasting memories. Join fellow running enthusiasts in this celebration of fitness and camaraderie as you conquer the miles in beautiful South Texas!