OTT Marathon
Dol-y-Gaer, United Kingdom • 16 May 2026
Event Overview
The OTT Marathon & 10 Mile Race takes place on Saturday, May 16, 2026, starting and finishing at Parkwood Dolygaer in Merthyr Tydfil, within the Brecon Beacons. The event features two distances, a marathon and a 10-mile race, both on trail and mountain routes.
Distances
The event offers two trail running distances.
- Marathon: A looped course of approximately 26.2 miles with significant climbs, taking in Pen Y Fan, Fan Y Big, Talybont Reservoir, and Tor y Foel.
- 10 Mile Race: This course follows the marathon route to the first checkpoint before heading back to the finish via forestry tracks.
Course Details
The marathon route is described as a mountain run with climbs and scenic views. There is a single cutoff time of 6 hours at the 20.5-mile checkpoint, requiring a minimum pace of approximately 18 minutes per mile to continue. The event includes aid stations.
Participant Requirements
Participants must be 18 or older. The event has mandatory kit lists for each distance. For the marathon, this includes items such as a waterproof jacket and trousers, a warm layer, a head torch, a first aid kit, and a reusable cup. The 10-mile race requires a first aid kit, a bivvy or foil blanket, 500ml of water, a waterproof jacket, and a reusable cup. All finishers receive a coaster and a buff.
Entry Information
Entry is available for UK Athletics members and non-members at different fee levels. The entry period closes on Saturday, May 9, 2026. Visit the organization's website for the most recent information.