Sean O'Brien 100K/50M/50K/26.2/30K

Experience the ultimate challenge at the Sean O'Brien 100K/50M/50K/26.2/30K race, a prestigious event serving as a 2026 WS100 qualifier. Choose from a variety of distances including the 100k, 50-mile, 50k, marathon, and 30k, each starting at different times in the early morning. Join top male and female athletes who have conquered this demanding course in the past, showcasing incredible performances and determination. Don't miss the chance to test your limits and be part of this thrilling event. For more information and registration, visit the official website at ultrasignup.com.