100 mile ultra runs in UK
Find 100 mile ultra runs in UK in 2026/2027 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.
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- Fri 24 Apr
- £125
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.
- 100 miles trail running
- Sat 23 May
- £163-£165
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
- Sat 11 - Sun 12 Jul
- £129.99-£319.99
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.
- 24 hrs trail running + 3182 ft ascent
- Sat 25 Jul
- £330
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.
- 100 miles trail running + 4853 ft ascent
- Fri 18 - Sun 20 Sep
- £160-£220
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.
- 100 miles fell running + 4600 m ascent
- Fri 18 Sep
- From £99
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