16

100K ultra runs in UK

Find 100k ultra runs near me in UK for 2025/2026 - filter by date or location, 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
  • Entries close soon
  • Sat 6 - Sun 7 Sep
  • £199
  • Entries close soon
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
Entries close soon
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
  • Entries close soon
  • Sat 6 - Sun 7 Sep
  • £199
  • Entries close soon
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
  • 17 charities
  • Sat 13 - Sun 14 Sep
  • £199
  • 17 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
  • 17 charities
  • Sat 13 - Sun 14 Sep
  • £199
  • 17 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
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 19 Sep
  • £80
  • Fri 19 Sep
  • £80
Hope Valley, Derbyshire, UK

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.

  • Enter online
  • GPS tracking
  • Hilly
  • Age 20 & over
  • 100 km trail running + 3300 m ascent
This event gives participants the opportunity to take in a runnable, beautiful route which follows the North Walian coastline between Prestatyn and Bangor.
  • Sat 25 Apr 2026
  • £90.50
  • Sat 25 Apr 2026
  • £90.50
Prestatyn, Clwyd, UK

North Wales 100K

This event gives participants the opportunity to take in a runnable, beautiful route which follows the North Walian coastline between Prestatyn and Bangor.

  • Chip timing
  • Enter online
  • GPS tracking
  • Age 18 & over
  • 100 km trail running + 8000 ft ascent
The full circuit takes in both the Coastal and Castle loops for a magnificent tour of the stunning South Downs. Steeped in history and uniquely varied, the 100K offers a course truly fit for royalty.
  • Sat 20 Jun 2026
  • £150
  • 3 charities
  • Sat 20 Jun 2026
  • £150
  • 3 charities
Chichester, West Sussex, UK

Race to the King | 100K Non-Stop

The full circuit takes in both the Coastal and Castle loops for a magnificent tour of the stunning South Downs. Steeped in history and uniquely varied, the 100K offers a course truly fit for royalty.

  • Chip timing
  • Enter online
  • GPS tracking
  • Undulating
  • Age 18 & over
  • 100 km trail running + 1510 m ascent
Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.
  • Sat 11 Jul 2026
  • £175
  • 6 charities
  • Sat 11 Jul 2026
  • £175
  • 6 charities
Watlington, Oxfordshire, UK

Race to the Stones | 100K Non-stop

Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.

  • Chip timing
  • Enter online
  • GPS tracking
  • Undulating
  • Age 18 & over
  • 100 km trail running + 3704 ft ascent
Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.
  • Sat 11 Jul 2026
  • £245
  • 3 charities
  • Sat 11 Jul 2026
  • £245
  • 3 charities
Watlington, Oxfordshire, UK

Race to the Stones | 100K Over Two Days

Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.

  • Chip timing
  • Enter online
  • GPS tracking
  • Undulating
  • Age 18 & over
  • 100 km trail running + 3704 ft ascent
Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.
  • Sat 11 Jul 2026
  • £155
  • Sat 11 Jul 2026
  • £155
Watlington, Oxfordshire, UK

Race to the Stones | 100K Two Days no camping

Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.

  • Chip timing
  • Enter online
  • GPS tracking
  • Undulating
  • Age 18 & over
  • 100 km trail running + 3704 ft ascent
  • Sat 9 Aug
Newmarket, Suffolk, UK

Stour Valley Path Ultra Run | 100K

  • 100 km trail running + 912 m ascent
  • Sat 16 - Sun 17 Aug
Northampton, Northamptonshire, UK

Foxton Hound Ultras | 100K

  • 100 km trail running + 1035 m ascent
  • Sat 23 Aug
Melrose, Scottish Borders, UK

Run the Borders | Full 109K

  • 109 km trail running
  • Sun 22 Mar 2026
Sowerby Bridge, West Yorkshire, UK

Canalathon-Ultra Running Festival | 100K

  • 100 km road running + 377 m ascent
  • Sun 3 May 2026
Shipston-on-Stour, Warwickshire, UK

Tempo Trail Races | 100K Ultra

  • 100 km trail running + 6682 ft ascent
  • Sat 9 May 2026
Chesham, Buckinghamshire, UK

Chiltern Hills 100K

  • 100 km trail running

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