5

100K ultra runs in UK in September 2025

Find 100k ultra runs near me in UK in September 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.

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The full distance option of the South Coast Challenge from sunny Eastbourne, over the magnificent Seven Sisters, onto Cuckmere Haven and over the South Downs all the way to historic Arundel.
  • Sat 6 - Sun 7 Sep
  • £199
  • 15 charities
  • Sat 6 - Sun 7 Sep
  • £199
  • 15 charities
Polegate, East Sussex, UK

South Coast Ultra Challenge | Full 100km continuous

The full distance option of the South Coast Challenge from sunny Eastbourne, over the magnificent Seven Sisters, onto Cuckmere Haven and over the South Downs all the way to historic Arundel.

  • Chip timing
  • Enter online
  • GPS tracking
  • Hilly
  • Age 18 & over
  • 100 km trail running + 2100 m ascent
The full distance option of the South Coast Challenge over 2 days with 57km on day 1 and 43km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.
  • Sat 6 - Sun 7 Sep
  • £199
  • 14 charities
  • Sat 6 - Sun 7 Sep
  • £199
  • 14 charities
Polegate, East Sussex, UK

South Coast Ultra Challenge | Full 100km over 2 days

The full distance option of the South Coast Challenge over 2 days with 57km on day 1 and 43km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.

  • Chip timing
  • Enter online
  • GPS tracking
  • Hilly
  • Age 18 & over
  • 100 km trail running + 2100 m ascent
The full, non-stop option of the epic Thames Path Challenge from leafy South West London following the river to Hampton Court, Runnymede to finish at Henley-on-Thames for a celebratory finish and BBQ!
  • Sat 13 - Sun 14 Sep
  • £199
  • 18 charities
  • Sat 13 - Sun 14 Sep
  • £199
  • 18 charities
London, UK

Thames Path Ultra Challenge | Full 100km Continuous

The full, non-stop option of the epic Thames Path Challenge from leafy South West London following the river to Hampton Court, Runnymede to finish at Henley-on-Thames for a celebratory finish and BBQ!

  • Chip timing
  • Enter online
  • GPS tracking
  • Flat
  • Undulating
  • Age 18 & over
  • 100 km trail running + 350 m ascent
An epic challenge from leafy South West London on the River Thames featuring Hampton Court, Runnymede of Magna Carta Fame, Henley-on-Thames and a fabulous celebration finish - all in daylight.
  • Sat 13 - Sun 14 Sep
  • £199
  • 18 charities
  • Sat 13 - Sun 14 Sep
  • £199
  • 18 charities
London, UK

Thames Path Ultra Challenge | Full 100km over 2 days

An epic challenge from leafy South West London on the River Thames featuring Hampton Court, Runnymede of Magna Carta Fame, Henley-on-Thames and a fabulous celebration finish - all in daylight.

  • Chip timing
  • Enter online
  • GPS tracking
  • Flat
  • Age 18 & over
  • 100 km trail running + 350 m ascent
By Wilderness Development Trek or Run: 25km, 50km, 75km, 100km or 100miles in 24 hours
  • Fri 19 Sep
  • Fri 19 Sep
Hope Valley, Derbyshire, UK

Peak District Challenge | Gold Ultra 100K

By Wilderness Development Trek or Run: 25km, 50km, 75km, 100km or 100miles in 24 hours

  • Enter online
  • GPS tracking
  • Age 18 & over
  • 100 km trail running

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