100 mile ultra marathons

100 mile ultra marathons

The UK's most comprehensive calendar of 100 mile ultra runs - some of the biggest endurance challenges on Earth! Search by date, location or map to find a 100 mile ultra marathon near you or browse to discover your perfect event.

View all 100 mile ultra runs

100 mile ultra runs

The longest of the ultra distances, 100 mile ultra marathons are a big challenge for any runner. But distance isn't always the key challenge with long ultra runs - the total ascent gives a much better indication of how hard it will be. Select your location to find 100 mile ultra runs in your area or scroll down to browse events coming up.

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100 mile ultra runs in 2025

Featured events are listed below - select a month/region or the map view to see all events.

Set off 9pm Friday; get back by 9pm Saturday. Navigate 100 miles through the night via set checkpoints over hilly and challenging terrain and maintain 7kph throughout.
  • Fri 19 Sep
  • £99
Hope Valley, Derbyshire, UK

Peak District Challenge | 100 Miles Ultra

Set off 9pm Friday; get back by 9pm Saturday. Navigate 100 miles through the night via set checkpoints over hilly and challenging terrain and maintain 7kph throughout.

  • 100 miles trail running + 4800 m ascent
Can you survive Farmmageddon? Held over 32-hours, runners will cover the fantastic 5.3K loop through the lovely grounds of Hyde Hall Farm and receive a t-shirt, buckle and medal to prove it!
  • Sat 23 May 2026
  • £163-£165
Buntingford, Hertfordshire, UK

Farmmageddon | 100 Miles

Can you survive Farmmageddon? Held over 32-hours, runners will cover the fantastic 5.3K loop through the lovely grounds of Hyde Hall Farm and receive a t-shirt, buckle and medal to prove it!

  • 100 miles trail running + 164 ft ascent
  • Chip timing
  • Enter online
  • Undulating
  • Traffic free
  • Age 21 & over
  • Ultra runs

100 mile ultra runs near you

Select your location for 100 mile ultra marathons in your area.