17th Annual F^3 Lake Half Marathon & 5k

Get ready to join the 17th Annual F^3 Lake Half Marathon & 5k, a cherished winter tradition in Chicago, Cook County. Lace up for a thrilling run on January 31, 2026, starting at the United Club in Soldier Field. This event, featuring a picturesque lakefront course with 5-kilometer splits, caters to both seasoned runners preparing for a spring marathon and fitness enthusiasts embracing a new year of activity. With a history of consistently selling out, secure your spot for a chance to receive a trendy hoodie and a finisher's medal. After crossing the finish line, revel in your achievement at the post-race celebration at WEATHERMARK TAVERN on 1503 S. Michigan Ave. Embrace the joy of winter running and make unforgettable memories at this unmissable event.