Yr Wyddfa Ultra 100

The Yr Wyddfa Ultra 100 is a challenging ultramarathon covering 102 miles with 5,788 meters of elevation, set in Snowdonia National Park, Wales. Scheduled for September 6, 2025, the race features 10 checkpoints offering support and refreshments, with a 40-hour cut-off time. Participants must be at least 20 years old, in good health, and experienced in mountain ultramarathons.

The event is self-navigated, requiring runners to carry mandatory gear, including maps, a compass, and weather protection. Live GPS tracking is available, and finishers earn a distinctive buckle based on their placement. The race emphasizes safety, preparation, and respect for the mountain environment. Visit the organization's website for the most recent information.