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100K ultra runs in September 2026

Find 100k ultra runs near me in September 2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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The South Downs National Park is a superb backdrop for a real challenge featuring Beachy Head, the Seven Sisters and the South Downs Way with a choice of distances from 25km right up to 100km!
  • Sat 5 - Sun 6 Sep
  • £89-£199
Polegate, East Sussex

South Coast Ultra Challenge

The South Downs National Park is a superb backdrop for a real challenge featuring Beachy Head, the Seven Sisters and the South Downs Way with a choice of distances from 25km right up to 100km!

  • 100K ultra run 2
  • Ultra run 2
  • Trail run
  • Families
  • Beginner-friendly
  • Music
  • Event village
  • Urban
  • Rural
  • Coast
  • Age 14 & over
England’s greatest river provides a fantastic backdrop for an unforgettable 'festival' challenge weekend, with distances from 10km right up to 100km there’s a Thames Challenge for everyone!
  • Fri 11 - Sun 13 Sep
  • £39-£199
London

Thames Path Ultra Challenge

England’s greatest river provides a fantastic backdrop for an unforgettable 'festival' challenge weekend, with distances from 10km right up to 100km there’s a Thames Challenge for everyone!

  • 100K ultra run 2
  • 50K ultra run 2
  • Trail run 4
  • Charity walk 4
  • Ultra run
  • + 1 more race
  • Families
  • Beginner-friendly
  • Entertainment
  • Music
  • Event village
  • Urban
  • Rural
  • Age 14 & over
The Leeds Country Way In a Day 100km is a full circumnavigation of the city of Leeds via the local LCW footpaths.
  • Sat 12 Sep
  • £25-£27
Bradford, West Yorkshire

Leeds Country Way In A Day 100K

The Leeds Country Way In a Day 100km is a full circumnavigation of the city of Leeds via the local LCW footpaths.

  • 100K ultra run 2
  • Beginner-friendly
  • Event village
  • Rural
  • Age 18 & over
A hilly and challenging route showcasing the best of the Peak District for those who can maintain 4kph over 24 hours. Night navigation experience is essential.
  • Fri 18 Sep
  • From £86
Hope Valley, Derbyshire

Peak District Challenge | Gold Ultra 100K

A hilly and challenging route showcasing the best of the Peak District for those who can maintain 4kph over 24 hours. Night navigation experience is essential.

  • 100 km trail running + 2900 m ascent
  • Enter online
  • GPS tracking
  • Hilly
  • Age 20 & over

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