Loud Thunder 50

Join the thrilling Loud Thunder 50, proudly presented by Sun Trail Running, on Saturday, April 18th, 2026, for an unforgettable trail running experience in the scenic Loud Thunder Forest Preserve along the mighty Mississippi River. This event features challenging and rewarding 50-mile, 50k, and half marathon races on rugged, beautiful trails designed to showcase the park’s natural beauty while providing a low-key, community-focused ultra running experience. Starting and finishing at the Horse Corral Campground, the race offers fully stocked aid stations, custom swag, finisher awards, and post-race food and drink, with camping available on-site and nearby. With staggered start times and generous cutoffs, runners will navigate primarily looped courses that foster camaraderie and competition. Registration is exclusively online with no refunds or bib transfers, but deferral options and a waitlist are available. Participants finishing the 50-mile race within the 14-hour cutoff earn an exclusive finisher hoodie and commemorative patch. Whether you seek a personal challenge or the joy of trail running in a stunning natural setting, the Loud Thunder 50 delivers an exceptional, well-supported event dedicated to runners, trails, and conservation. Secure your spot early to be part of this premier late spring ultra running celebration.