Yr Wyddfa Ultra 100

Betws-y-Coed, United Kingdom • 6 Sep 2025

The Yr Wyddfa Ultra 100 is a challenging 102-mile ultramarathon held in Snowdonia National Park, Wales, featuring 5,788 meters of ascent across stunning mountainous terrain. The race starts and finishes in Betws-y-Coed and includes 10 well-supported checkpoints offering refreshments and medical aid. It is a self-navigation event requiring runners to carry mandatory safety and navigation kit.

With a 40-hour cut-off time, the race accommodates 250 participants and offers live GPS tracking. Finishers earn distinctive buckles based on their placement, and the event emphasizes safety, environmental care, and mountain experience. Entry is by application, requiring prior ultramarathon and mountain navigation experience. Visit the organization's website for the most recent information.

Race information

102 mi
5788 m+
Yr Wyddfa Ultra 100 Mile
Visit the organization's website for the most recent information.
Trail runs nearby

Moel Famau 24 is a unique 12- or 24-hour endurance event held on the iconic Clwydian Hill of Moel Famau, featuring a challenging 7.2 km loop with 500 meters of ascent per lap. Participants, including solo runners and teams, aim to complete as many laps as possible within their chosen time frame. The..

The Montane Dragon's Back Race® is a legendary and grueling 6-day ultra running event covering 380 kilometers with 16,400 meters of ascent along the spine of Wales. Starting at Conwy Castle and finishing at Cardiff Castle, it is widely regarded as the world's toughest mountain race. The course chall..

UTMB Index

The Dee Way 120 is a challenging ultra-distance trail race following nearly the entire 120-mile course of the River Dee from Llanwchllyn to Prestatyn in North Wales. The route traverses diverse and scenic landscapes, including valleys, historic villages, and coastal paths, offering breathtaking view..

The Yr Wyddfa Ultra 50 is a challenging 45-mile ultramarathon held in Snowdonia National Park, Wales, starting and finishing in the picturesque village of Betws-y-Coed. Featuring 3,254 meters of ascent, the mountain trail course includes iconic landmarks such as Heather Terrace on Tryfan, the summit..

UTMB Index

The RunThrough Snowdonia Sea2Sky Trail Races, held in September 2025 at Barmouth, UK, offer two challenging distances: 25k and 53k. Set in the stunning landscapes of Snowdonia, participants can enjoy breathtaking trail views while tackling a well-marshalled course with water stations. The event feat..

UTMB Index

The 2 Hillforts Hill Race is an exciting running event set to take place in 2024, starting and finishing at Plas Dolben Farm in Llangynhafal. Participants will tackle a challenging course that spans just under 9 miles, featuring a significant ascent of 2500 feet as it navigates the scenic Hillforts..