South Downs 100 mile (Autumn Event)

Lewes, United Kingdom • 3 Oct 2026

The South Downs 100 mile (Autumn Event) is a challenging single-loop trail race held in the scenic South Downs National Park, starting at Plumpton Racecourse in Lewes, East Sussex. Covering 100 miles with over 12,000 feet of elevation, the course features rolling hills and stunning views, supported by 12 aid stations. Runners have a 34-hour cutoff time to complete the race. The event offers free onsite camping for participants over the weekend. Additionally, the race is part of the South Downs Triple Crown challenge, launching in 2025, where runners can complete three ultra-distance races within a calendar year. Visit the organization's website for the most recent information.

Race information

100 mi
3657 m+
100 Mile
Visit the organization's website for the most recent information.
Trail runs nearby

The Thackray Williams Sevenoaks 7 is a celebrated 7-mile trail race held annually in the scenic Knole Park, Sevenoaks, Kent. Marking its 30th edition in 2025, the course features challenging hills, multi-terrain paths, and picturesque woodland trails, offering an exhilarating experience for runners..

Bright Skies Surrey Hills is a daytime trail running event held at Denbies Wine Estate in Dorking, UK. It offers marathon, half marathon, and 10K distances, including canicross races, plus 1K and 2K kids’ races for ages 3-12. The course features an undulating route through Surrey’s rolling, muddy hi..

The Surrey Slog, also known as the Holmbury Hill Challenge, is a challenging trail running event held in the scenic Surrey Hills near Peaslake. The race features a hilly, undulating multi-loop cross-country course primarily on tracks around Holmbury Hill, with well-marked routes and marshalled key p..

The Ashdown Forest 10 & 5 Mile Series is an eco-friendly trail running event held at Pippingford Park Manor in East Sussex. This two-race series offers runners the choice of 10-mile or 5-mile distances through stunning, undulating forest trails with picturesque scenery. The event emphasizes sustaina..

The Maverick X Series East Sussex 2025 is a trail running event held at Stanmer Park, near Brighton, East Sussex. It offers five routes ranging from a 6 km sprint to a challenging 50 km ultra, all featuring hilly, hard-packed trails suitable for all levels. The course includes scenic sections of the..

UTMB Index

The Westfield 7.5km Trail Race is a scenic trail running event held at Westfield Community Hall in the UK. The course features a mainly off-road loop that follows the famous 1066 Country Walk for the first 3km, passing landmarks like the Bayeux Tapestry-inspired Farbanks Henge sculptures, then retur..