7

100 mile ultra runs in UK

Find 100 mile 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.

Filter by date

Filter by place

Filter by category

Map

Event listings

Select an event for photos, video, route, location, reviews, entry fees and how to enter.

Tackle the new addition to the Thames Ring Series — a 100-mile ultra along rivers and canals, combining stunning scenery, grit, and determination in one unforgettable endurance adventure.
  • Fri 24 Apr 2026
  • £100-£120
Reading, Berkshire, UK

Thames Ring Series | TR100

Tackle the new addition to the Thames Ring Series — a 100-mile ultra along rivers and canals, combining stunning scenery, grit, and determination in one unforgettable endurance adventure.

  • Enter online
  • GPS tracking
  • Flat
  • Age 18 & over
  • 100 miles trail running
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!

  • Chip timing
  • Enter online
  • Undulating
  • Traffic free
  • Age 21 & over
  • 100 miles trail running
Yr Wyddfa (Snowdon) is the highest mountain in England and Wales. Your challenge is to ascend and descend as many times as possible in 24 hours - solo or as a relay team.
  • Sat 11 - Sun 12 Jul 2026
  • £129.99-£319.99
Caernarfon, Gwynedd, UK

Black Diamond Yr Wyddfa Snowdon24

Yr Wyddfa (Snowdon) is the highest mountain in England and Wales. Your challenge is to ascend and descend as many times as possible in 24 hours - solo or as a relay team.

  • Chip timing
  • Enter online
  • Mountainous
  • Traffic free
  • Relay
  • Age 18 & over
  • 24 hrs trail running + 3182 ft ascent
The 100-mile ultra for people who don't do 100-mile ultramarathons. Walk or run from Edinburgh Castle to Glamis within 48 hours, fully supported.
  • Sat 25 Jul 2026
  • £330
Edinburgh, UK

Rat Race 100 Ultramarathon

The 100-mile ultra for people who don't do 100-mile ultramarathons. Walk or run from Edinburgh Castle to Glamis within 48 hours, fully supported.

  • Recycling
  • Beginner-friendly
  • Enter online
  • GPS tracking
  • Hilly
  • Park
  • Rural
  • Coast
  • Sustainability policy
  • Public transport links
  • Age 18 & over
  • 100 miles trail running + 4853 ft ascent
Climb from Glen Nevis to Sgurr an Iubhair, traverse remote Corrour and Loch Ossian, then race rugged trails, forests and singletrack to a spectacular Nevis Range finish on this mountain adventure.
  • Fri 18 - Sun 20 Sep 2026
  • £160-£220
Fort William, Highland, UK

Skyline Scotland | Skyline Scotland 100M

Climb from Glen Nevis to Sgurr an Iubhair, traverse remote Corrour and Loch Ossian, then race rugged trails, forests and singletrack to a spectacular Nevis Range finish on this mountain adventure.

  • Chip timing
  • Enter online
  • GPS tracking
  • Mountainous
  • Age 18 & over
  • 100 miles fell running + 4600 m ascent
  • Sat 12 - Sun 13 Sep 2026
Retford, Nottinghamshire, UK

Robin Hood 100

  • 100 miles road running
  • Fri 18 Sep 2026
Hope Valley, Derbyshire, UK

Peak District Challenge | 100 Miles Ultra

  • 100 miles trail running + 4800 m ascent

Search options

Back to search options
4 steps to wellbeing
Sleep well

A good night's sleep is an essential foundation for a healthy lifestyle, effective training and weight control.

Train slow

Low-intensity training is easier for you, reduces the risk of injury and helps builds an efficient aerobic system.

Eat natural

Cut out sugar & junk food, reduce carbs, eat natural foods and train your body to burn fat for fuel.

Get outdoors

Fresh air, natural light and reconnecting with nature all help to improve mental and physical wellbeing.