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100K ultra runs in UK

Find 100k ultra runs in UK in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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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
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
Set to be one of the greatest Ultra Challenges – basecamp is in Scarborough – famous for its Fair, and a popular seaside spa since the 17th century.
  • Sat 20 - Sun 21 Jun 2026
  • £49-£199
Scarborough, North Yorkshire, UK

North Yorks Ultra Challenge

Set to be one of the greatest Ultra Challenges – basecamp is in Scarborough – famous for its Fair, and a popular seaside spa since the 17th century.

  • Beginner-friendly
  • Event village
  • Age 16 & over
  • 100K ultra run 2
  • 50K ultra run 2
  • Trail run
  • 10 miler
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
  • £175
  • 2 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
Conquer Britain's oldest trail, the ancient Ridgeway, as you race towards the 5000-year-old Avebury Standing Stones.
  • Sat 11 - Sun 12 Jul 2026
  • £90-£275
Watlington, Oxfordshire, UK

Race to the Stones

Conquer Britain's oldest trail, the ancient Ridgeway, as you race towards the 5000-year-old Avebury Standing Stones.

  • Families
  • Recycling
  • Beginner-friendly
  • Event village
  • Rural
  • Sustainability policy
  • Public transport links
  • Age 18 & over
  • 50K ultra run 2
  • 100K ultra run 3
A runnable 100km with a Scottish Highland journey at the heart of the race experience with an exciting midnight mass start.
  • Sat 19 - Sun 20 Sep 2026
  • £140-£200
Fort William, Highland, UK

Skyline Scotland | Skyline Scotland 100K

A runnable 100km with a Scottish Highland journey at the heart of the race experience with an exciting midnight mass start.

  • Enter online
  • GPS tracking
  • Mountainous
  • Age 18 & over
  • 106 km trail running + 6350 m ascent
  • 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
  • Sat 16 - Sun 17 May 2026
Wareham, Dorset, UK

Jurassic Coast Ultra Challenge

  • Trail run 2
  • 50K ultra run 2
  • 100K ultra run 2
  • Marathon
  • Ultra run
  • + 1 more race
  • Sat 6 - Sun 7 Jun 2026
Kendal, Cumbria, UK

Lake District Ultra Challenge

  • Trail run 2
  • 50K ultra run 2
  • 100K ultra run 2
  • Marathon
  • Sat 20 Jun 2026
Hebden Bridge, West Yorkshire, UK

Two Rose Ultra | Two Roses Ultra - 100K

  • 100 km multi terrain running + 5175 ft ascent
  • Fri 3 - Sat 4 Jul 2026
Epping, Essex, UK

The Full Essex Way Ultra

  • 82 miles trail running + 3469 ft ascent
  • Sat 11 - Sun 12 Jul 2026
Caernarfon, Gwynedd, UK

Black Diamond Yr Wyddfa Snowdon24

  • 24 hrs trail running + 3182 ft ascent
  • Fri 11 - Sun 13 Sep 2026
London, UK

Thames Path Ultra Challenge

  • 100K ultra run 2
  • 50K ultra run 2
  • Trail run 4
  • Charity walk 4
  • Ultra run
  • + 1 more race
  • Fri 18 Sep 2026
Hope Valley, Derbyshire, UK

Peak District Challenge | Gold Ultra 100K

  • 100 km trail running + 3300 m ascent

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