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Three Forts Marathon

Quick facts

Location Worthing, United Kingdom

Distance Ultra marathon

Rescheduled to 02 May 2021

Previous date: 03 May 2020

About Three Forts Marathon

The Three Forts Marathon, first run in 1977, is sometimes referred to as ‘The Tough One’. It is a tough race with one more mile than the standard marathon distance with an overall climb of 3,450 foot. There is also a half marathon option.

The ‘The Tough One’ is a hilly, rugged race starting from Hill Barn and heading north to Cissbury Ring. Ruuners then head eastwards towards Coombs and then on towards Botolphs and the crossing at River Adur before moving on to Devil’s Dyke and then back to the River Adur, and the inward half of the race.

The inward leg of the race carries on across the South Downs to Chanctonbury Ring. Next, runners are directed southwest towards Findon Park Farm. They then stays on public paths bridleways on to Cissbury Ring before returning to Hill Barn.


Half Marathon

  • 21.097km


  • 43.45218km

Hill Barn Recreation Ground



Known as "The Tough One" the Three Forts Marathon (approximately 27.2 miles) includes a total of c. 3450 ft of climb with stiles and rough tracks underfoot. The route runs northwards from Hill Barn to Cissbury Ring, then eastwards towards Coombs then to Botolphs and the River Adur crossing. The route then goes to Devil’s Dyke and back to the River Adur. It continues on the South Downs Way to Chanctonbury Ring, where it swings south-west to Findon Park Farm. It stays on public bridleways to Cissbury Ring and back to Hill Barn. The Half Marathon, with a total climb of c.1450 takes a shorter route to Steyning Bowl and picks up the last part of the Marathon route. The routes will be clearly sign posted and marshals will be placed at key places. In addition there are 8 Aid Stations spaced along the route providing refreshments and support to entrants. The start/finish is on the Recreation Ground at Hill Barn, Worthing.

The race information has been found on the official website of the event or through publicly available sources. Always refer to the official website the latest race information. Please let us know if any data is wrong or missing, by emailing us.