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100K ultra runs in UK in May 2025

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

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An epic challenge, making a full 106km circuit of the Isle of Wight, starting and finishing in Chale, enjoy well stocked rest stops and superb scenery every step of the way.
  • Sat 3 May 2025
  • 12 charities
  • Sat 3 May 2025
  • 12 charities
Ventnor, Isle of Wight, UK

Isle of Wight Ultra Challenge | Full continuous charity places

An epic challenge, making a full 106km circuit of the Isle of Wight, starting and finishing in Chale, enjoy well stocked rest stops and superb scenery every step of the way.

  • Chip timing
  • Enter online
  • GPS tracking
  • Undulating
  • Hilly
  • Age 18 & over
  • 106 km multi terrain running + 1960 m ascent
The full 106km circumnavigation of the Isle of Wight, in daylight hours. Overnight at Cowes for a well-earned rest on this wonderful exploration of the coastal routes around the island.
  • Sat 3 - Sun 4 May 2025
  • 12 charities
  • Sat 3 - Sun 4 May 2025
  • 12 charities
Ventnor, Isle of Wight, UK

Isle of Wight Ultra Challenge | Full 2 day daylight charity places

The full 106km circumnavigation of the Isle of Wight, in daylight hours. Overnight at Cowes for a well-earned rest on this wonderful exploration of the coastal routes around the island.

  • Chip timing
  • Enter online
  • Undulating
  • Hilly
  • Age 18 & over
  • 106 km multi terrain running + 1960 m ascent
Take on the full 100km challenge across two days, to enjoy the entirety of the route during daylight, with camping options at the halfway Basecamp in Weymouth.
  • Sat 17 - Sun 18 May 2025
  • 13 charities
  • Sat 17 - Sun 18 May 2025
  • 13 charities
Wareham, Dorset, UK

Jurassic Coast Ultra Challenge | Full 100km over 2 days charity places

Take on the full 100km challenge across two days, to enjoy the entirety of the route during daylight, with camping options at the halfway Basecamp in Weymouth.

  • Chip timing
  • Enter online
  • GPS tracking
  • Hilly
  • Age 18 & over
  • 100 km trail running + 2300 m ascent
A demanding challenge, taking on 100km along the UNESCO World Heritage Jurassic Coast, starting from Corfe Castle on a fully-supported challenge visiting the highlights of the region.
  • Sat 17 - Sun 18 May 2025
  • 13 charities
  • Sat 17 - Sun 18 May 2025
  • 13 charities
Wareham, Dorset, UK

Jurassic Coast Ultra Challenge | Full 100km continuous charity places

A demanding challenge, taking on 100km along the UNESCO World Heritage Jurassic Coast, starting from Corfe Castle on a fully-supported challenge visiting the highlights of the region.

  • Chip timing
  • Enter online
  • GPS tracking
  • Hilly
  • Age 18 & over
  • 100 km trail running + 2300 m ascent
Walk, jog or run the journey from Capital to Coast, over the North and South Downs. A fully supported challenge leaving Richmond-upon-Thames for the finish line at Brighton Racecourse.
  • Sat 24 May 2025
  • 13 charities
  • Sat 24 May 2025
  • 13 charities
Richmond, UK

London 2 Brighton Ultra Challenge | Full 100km continuous charity places

Walk, jog or run the journey from Capital to Coast, over the North and South Downs. A fully supported challenge leaving Richmond-upon-Thames for the finish line at Brighton Racecourse.

  • Chip timing
  • Enter online
  • GPS tracking
  • Hilly
  • Age 18 & over
  • 100 km trail running + 1500 m ascent
Walk, jog or run the full 100km London to Brighton route, over two daytime sessions, with an overnight stop at the Basecamp at Turners Hill.
  • Sat 24 - Sun 25 May 2025
  • 13 charities
  • Sat 24 - Sun 25 May 2025
  • 13 charities
Richmond, UK

London 2 Brighton Ultra Challenge | Full 100km over 2 days charity places

Walk, jog or run the full 100km London to Brighton route, over two daytime sessions, with an overnight stop at the Basecamp at Turners Hill.

  • Enter online
  • Undulating
  • Hilly
  • Age 18 & over
  • 100 km trail running + 1500 m ascent
  • Sun 25 May 2025
Arundel, West Sussex, UK

UK Ultra South Downs 100K

  • 100 km trail running

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