Centurion Running Autumn 100®
The Autumn 100 is a 100 mile (161 km) continuous trail race based in the twinned villages of Goring & Streatley on the river Thames. The course reflects the shape of a cross and takes runners on a series of 4 different 25 mile out and back spurs using sections of both the Ridgeway and Thames Path National Trails.
Welcome to the fastest trail 100 in the UK! Runners will depart from Goring at 0900 and make their way to Little Wittenham on the first out and back section on the Thames Path. On returning to Goring, runners will be faced with the more challenging but beautiful second spur of the course, out to Swyncombe Farm on the Ridgeway before returning to Goring a second time. Spur three takes runners west on the Ridgeway to Chain Hill before returning to Goring for the final leg on the Thames Path to Reading and return for their 100 mile finish.
During a dry spell the route is flat, fast and picturesque presenting ideal conditions for a trail 100. However, runners will also be faced with up to 13 hours of darkness and the possibility of low temperatures and wet and windy conditions - classic British autumn!
As with all Centurion events, runners will be fully supported by 16 well stocked aid stations, full medical support and course markings in addition to the pre-existing National Trail waymarkers. Race held under full UK Athletics Permit granted through the TRA (Permit Number Pending).
Vital Stats
- Distance: 100mi (161KMs)
- Elevation: 5000ft (1500m)
- Cut-off: 28 hours
- Entry Fee: £220
- Date: 17 Oct 2026 09:00
- Location: EU / UK / ENGLAND / SOUTH-EAST
- Terrain: 20% road / 80% trail
- # of Aid Stations: 16
General Info
Entries for the event open on Saturday 8th November 2025 at 1000. Places are available on a first come, first served basis. Entrants must meet the minimum qualification standard below in order to apply. Qualifiers will be checked six weeks from race day - if you have not updated your registration with a valid qualifier by that point or have not met the criteria, you will be contacted and potentially removed from the start list. Once the event fills up we will run a waiting list.
The entry fee is £220 for UKA affiliated runners, £222 for unaffiliated. Runners may also enter the event as part of the 100 mile Grand Slam.