2025 Tri312 Indoor Triathlon & Duathlon Series

Experience the ultimate fitness test at the 2025 Tri312 Indoor Triathlon & Duathlon Series in Chicago, Cook County, spanning from February 6 to December 31, 2025! This dynamic indoor event caters to athletes of all levels with its unique format: a 10-minute swim, 20-minute bike, and 15-minute run for the triathlon, and a 20-minute bike followed by a 15-minute run for the duathlon. Join a thriving community of fitness enthusiasts and showcase your skills with our innovative scoring system that levels the playing field across all disciplines. Whether you're a newcomer eager to explore triathlons or a seasoned competitor chasing victory, this event guarantees excitement, camaraderie, and a shot at prestigious prizes. Secure your spot early to enjoy discounts and revel in the thrill of indoor racing in the vibrant city of Chicago!