Centurion Autumn 100
Goring, United Kingdom • 17 Oct 2026
Autumn 100 - Centurion Running
The Autumn 100 is a 100 mile (161 km) continuous trail race held on 17 October 2026 from Goring and Streatley on the River Thames. The course totals about 5000 ft (1500 m) of elevation, is marked, and has a 28 hour finish time limit. The event is limited to 250 starters.
The route is four separate 25 mile out and back sections that use both the Thames Path and the Ridgeway National Trails and meet at Goring and Streatley. The four spurs run to Little Wittenham, Swyncombe Farm, Chain Hill and Reading before each return to Goring. The course includes sections of trail and some road; about 80 percent is trail and 20 percent road.
Support measures include 16 fully stocked aid stations offering options for vegetarian, vegan and gluten free needs, hot drinks on legs 2 to 4, hot food at Goring and full medical support. Drop bags are available at miles 25, 50, 75 and 100 and must be under thirty litres. Pacers may join at mile 75 only and must cover the final 25 miles; crew access is not allowed.
Entries open 8 November 2025 and runners must meet a qualification standard of at least one 50 mile race completed within 15 hours since 1 January 2021. All finishers receive Centurion 100 mile buckles and additional awards are given for place, age groups and Grand Slam completion. Visit the organization's website for the most recent information.