100K ultra runs

100K ultra runs

A serious endurance challenge at over 60 miles and taking a full day to complete!

37 100K ultra runs in the UK

The middle of the common ultra distances at just over 60 miles, 100K ultra marathons are a big step up from the marathon. Despite this, distance is not always the key challenge with ultra runs - the total ascent gives a much better indication of how hard it will be. Select your location to find 100K ultra runs in your area or scroll down to browse events coming up.

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100K ultra runs in 2023

Featured events are listed below - select your region to see all events.

100K ultra runs in 2024

Featured events are listed below - select your region to see all events.

A classic trail race between two cities finishing in the capital, brought to you by experienced race directors of over 100 races, with Gold/Silver/Bronze medals depending on finishing time.
  • Sat 27 Apr
  • £85
  • Entries closed
Brighton, East Sussex, UK

Brighton to London Ultra

A classic trail race between two cities finishing in the capital, brought to you by experienced race directors of over 100 races, with Gold/Silver/Bronze medals depending on finishing time.

  • Entries closed
  • 100 km trail running + 1489 m ascent
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.
  • Sun 5 May
  • £198
  • 8 charities
Ventnor, Isle of Wight, UK

Isle of Wight Challenge | Full 106km continuous

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.

  • 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.
  • Sun 5 - Mon 6 May
  • £198
  • 8 charities
Ventnor, Isle of Wight, UK

Isle of Wight Challenge | Full 106km over 2 days

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.

  • 106 km multi terrain running + 1960 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 25 May
  • £198
  • 9 charities
Richmond, UK

London 2 Brighton Challenge | Full 100km continuous

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.

  • 100 km trail running + 1490 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.
  • Sun 26 May
  • £198
  • 9 charities
Richmond, UK

London 2 Brighton Challenge | Full 100km over 2 days

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.

  • 100 km trail running + 1490 m ascent
Take on 50 historic miles across the beautiful Southern Upland Way - one of the greatest trails in the UK. Ultrarunners will tackle several ascents, pass through forests, valleys and by lochs.
  • Sat 8 Jun
  • £89
Castle Douglas, Dumfries and Galloway, UK

Ultra Scotland 50

Take on 50 historic miles across the beautiful Southern Upland Way - one of the greatest trails in the UK. Ultrarunners will tackle several ascents, pass through forests, valleys and by lochs.

  • 56 miles trail running + 2447 m ascent
Take on the full 100km challenge, starting from Kendal Base Camp, a fully supported ultra. making a glorious loop of the spectacular south Lakes.
  • Sat 8 Jun
  • £198
  • 8 charities
Kendal, Cumbria, UK

Lake District Challenge | Full 100km continuous

Take on the full 100km challenge, starting from Kendal Base Camp, a fully supported ultra. making a glorious loop of the spectacular south Lakes.

  • 100 km trail running + 2500 m ascent
Take on the full 100km challenge during the hours of daylight, split over the two days. Enjoy the whole incredible route, whilst also getting a well-deserved overnight sleep.
  • Sat 8 Jun
  • £198
  • 8 charities
Kendal, Cumbria, UK

Lake District Challenge | Full 100km over 2 days

Take on the full 100km challenge during the hours of daylight, split over the two days. Enjoy the whole incredible route, whilst also getting a well-deserved overnight sleep.

  • 100 km trail running + 2500 m ascent
Take on the full 100K Race to the King ultra marathon challenge in one go. Fully supported through day and night on a route combining castles and coastal scenery.
  • Sat 15 - Sun 16 Jun
  • £165
  • 1 charity
Chichester, West Sussex, West Sussex, UK

Race to the King | 100K Non-stop

Take on the full 100K Race to the King ultra marathon challenge in one go. Fully supported through day and night on a route combining castles and coastal scenery.

  • 100 km trail running + 4619 ft ascent
Take on a 100km challenge, making a fully supported loop from Cirencester, exploring the picturesque, undulating terrain of the Cotswolds on a spectacular challenge.
  • Sat 22 Jun
  • £198
  • 10 charities
Cirencester, Gloucestershire, UK

Cotswold Way Challenge | Full 100km continuous

Take on a 100km challenge, making a fully supported loop from Cirencester, exploring the picturesque, undulating terrain of the Cotswolds on a spectacular challenge.

  • 100 km trail running + 2250 m ascent
Walk, jog or run the full 100km challenge, split over two days, with a well deserved nights sleep at the half way basecamp, to recharge your batteries overnight.
  • Sat 22 Jun
  • £197.99
  • 10 charities
Cirencester, Gloucestershire, UK

Cotswold Way Challenge | Full 100km over 2 days

Walk, jog or run the full 100km challenge, split over two days, with a well deserved nights sleep at the half way basecamp, to recharge your batteries overnight.

  • 100 km trail running + 2250 m ascent
Take on a 100km challenge, starting and finishing at the Bakewell Showground on a fully supported exploration of the beautiful Peak District National Park.
  • Sat 6 Jul
  • £198
  • 8 charities
Bakewell, Derbyshire, UK

Peak District Challenge | Full 100km continuous

Take on a 100km challenge, starting and finishing at the Bakewell Showground on a fully supported exploration of the beautiful Peak District National Park.

  • 100 km trail running + 2450 m ascent
Undertake the full 100km challenge, split over two days, to allow a good nights rest and appreciate the glorious scenery during the daytime.
  • Sat 6 Jul
  • £198
  • 8 charities
Bakewell, Derbyshire, UK

Peak District Challenge | Full 100km over 2 days

Undertake the full 100km challenge, split over two days, to allow a good nights rest and appreciate the glorious scenery during the daytime.

  • 100 km trail running + 2450 m ascent
Take on the full 100K Race to the Stones ultramarathon in one go. Fully supported through day and night on an incredibly scenic and historic route.
  • Sat 13 Jul
  • £175
  • 3 charities
Watlington, Oxfordshire, UK

Race to the Stones | 100K Non-stop

Take on the full 100K Race to the Stones ultramarathon in one go. Fully supported through day and night on an incredibly scenic and historic route.

  • 100 km trail running + 3704 ft ascent
Take on the full 100K Race to the Stones ultramarathon with an overnight stop at the all-inclusive Basecamp, meaning a good nights' sleep in between the 50K stints.
  • Sat 13 Jul
  • £255
  • 2 charities
Watlington, Oxfordshire, UK

Race to the Stones | 100K Two Days with camping

Take on the full 100K Race to the Stones ultramarathon with an overnight stop at the all-inclusive Basecamp, meaning a good nights' sleep in between the 50K stints.

  • 100 km trail running + 3704 ft ascent
Take on the full Race to the Stones 100K ultramarathon over two days, making your own arrangements for overnight accommodation at the halfway point.
  • Sat 13 Jul
  • £165
Watlington, Oxfordshire, UK

Race to the Stones | 100K Two Days no camping

Take on the full Race to the Stones 100K ultramarathon over two days, making your own arrangements for overnight accommodation at the halfway point.

  • 100 km trail running + 3704 ft ascent
The full, non-stop option of the 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 14 - Sun 15 Sep
  • £40-£198
  • 12 charities
London, UK

Thames Path Challenge | Full 100km continuous

The full, non-stop option of the 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.

  • 100 km trail running + 350 m ascent
The full distance option of the Thames Path Challenge over 2 days with 50km on day 1 and 50km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.
  • Sat 14 - Sun 15 Sep
  • £40-£198
  • 11 charities
London, UK

Thames Path Challenge | Full 100km over 2 days

The full distance option of the Thames Path Challenge over 2 days with 50km on day 1 and 50km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.

  • 100 km trail running + 350 m ascent
An exciting and spectacular event exploring the beautiful Brecon Beacons and finishing deep in the heart of the Black Mountains with incredible support guaranteed.
  • Sat 28 Sep
  • £90
Crickhowell, Powys, UK

Beacons to the Blacks | 50 Mile Ultra

An exciting and spectacular event exploring the beautiful Brecon Beacons and finishing deep in the heart of the Black Mountains with incredible support guaranteed.

  • 50 miles trail running + 10442 ft ascent

100K ultra runs near you

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