OTT Marathon
Always double-check with the organizer's website! This page may contain affiliate links.
OTT Marathon & 10 Mile Race
The OTT Marathon and 10 mile race take place on 16 May 2026 at Parkwood Dolygaer, Merthyr Tydfil, within the Brecon Beacons. The event uses a looped trail course that includes upland sections and notable climbs and views.
Distances:
- 26.2 (ish) Miles looped trail marathon starting and finishing at Parkwood Dolygaer
- 10 Miles follows the marathon route to Checkpoint 1 then returns to Dolygaer
The marathon route passes Pen Y Fan via Graig Fan Ddu, continues up Fan Y Big, goes toward Talybont Reservoir, and includes the final climb up Tor y Foel. The marathon has three checkpoints located at about 7 miles, 14.5 miles and 20.5 miles. The 10 mile race checks in at the 7 mile point before heading back to the finish.
There is a cutoff at the marathon Checkpoint 3 at 20.5 miles set at six hours after the start, which implies an approximate required pace of 18 minutes per mile or quicker. Aid stations include cakes.
Compulsory kit for marathon entrants includes a fully charged mobile phone, minimum 1 litre hydration, foil blanket or bivvy bag, 400 kcal emergency rations, basic first aid kit, head torch, compass, whistle, waterproof jacket and trousers (tapped seems), warm layer with hat and gloves, and a bag or rucksack with a reusable cup. Compulsory kit for the 10 mile race includes a first aid kit, bivvy or foil blanket, 500 ml of water, waterproof jacket, and a reusable cup.
Entrants must be 18 or older. All finishers receive an OTT Trail Marathon coaster and a buff. Visit the organization's website for the most recent information.
