100K ultra runs in UK
Find 100k 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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Select an event for photos, video, route, location, reviews, entry fees and how to enter.
- Sat 25 Apr
- £90.50
North Wales 100K
This event gives participants the opportunity to take in a runnable, beautiful route which follows the North Walian coastline between Prestatyn and Bangor.
- 100 km trail running + 8000 ft ascent
- Sat 20 Jun
- £175-£185
Race to the King | 100K Non-Stop
The full circuit takes in both the Coastal and Castle loops for a magnificent tour of the stunning South Downs. Steeped in history and uniquely varied, the 100K offers a course truly fit for royalty.
- 100 km trail running + 1510 m ascent
- Sat 11 - Sun 12 Jul
- £90-£275
Race to the Stones
Travel across the Ridgeway, the UK’s oldest footpath, pass through ancient landscapes, and end at the iconic Avebury Standing Stones. This is a journey on foot through 5,000 years of history.
- 50K ultra run 2
- 100K ultra run 3
- 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
- Fri 18 Sep
- From £86
Peak District Challenge | Gold Ultra 100K
A hilly and challenging route showcasing the best of the Peak District for those who can maintain 4kph over 24 hours. Night navigation experience is essential.
- 100 km trail running + 3300 m ascent
- Sat 19 - Sun 20 Sep
- £140-£200
Skyline Scotland | Skyline Scotland 100K
A runnable 100km with a Scottish Highland journey at the heart of the race experience with an exciting midnight mass start.
- 106 km trail running + 6350 m ascent
- Sun 22 Mar
- £90-£120
Canalathon-Ultra Running Festival | 100K
- 100 km road running + 377 m ascent
- Sat 2 - Sun 3 May
- £39-£199
Isle of Wight Ultra Challenge
- Trail run 3
- 50K ultra run 3
- 100K ultra run 2
- Ultra run
- Sun 3 May
- £77
Tempo Trail Races | 100K Ultra
- 100 km trail running + 6682 ft ascent
- Sat 16 - Sun 17 May
- £39-£199
Jurassic Coast Ultra Challenge
- Trail run 2
- 50K ultra run 2
- 100K ultra run 2
- Marathon
- Ultra run
- + 1 more race
- Sat 23 - Sun 24 May
- £89-£199
London 2 Brighton Ultra Challenge
- Trail run 3
- Ultra run 2
- Marathon
- 100K ultra run 2
- Sat 6 - Sun 7 Jun
- £39-£199
Lake District Ultra Challenge
- Trail run 2
- 50K ultra run 2
- 100K ultra run 2
- Marathon
- Sat 13 - Sun 14 Jun
- £39-£199
Cotswold Way Ultra Challenge
- Trail run 2
- Ultra run 4
- 100K ultra run
- 10K run
- Sat 20 - Sun 21 Jun
- £49-£199
North Yorks Ultra Challenge
- 100K ultra run 2
- 50K ultra run 2
- Trail run
- 10 miler
- Sat 20 Jun
- £20-£100
Two Rose Ultra | Two Roses Ultra - 100K
- 100 km multi terrain running + 5175 ft ascent
- Fri 3 - Sat 4 Jul
- £103-£105
The Full Essex Way Ultra
- 82 miles trail running + 3469 ft ascent
- Sat 4 - Sun 5 Jul
- £49-£199
Peak District Ultra Challenge
- Ultra run 3
- 100K ultra run 2
- Trail run 2
- Sat 18 - Sun 19 Jul
- £49-£199
Gower Peninsula Ultra Challenge
- 100K ultra run 2
- Ultra run
- 50K ultra run 2
- Marathon
- Multi-terrain run
- + 1 more race
- Sat 5 - Sun 6 Sep
- £89-£199
South Coast Ultra Challenge
- 100K ultra run 2
- Ultra run 2
- Trail run
- Fri 11 - Sun 13 Sep
- £39-£199
Thames Path Ultra Challenge
- 100K ultra run 2
- 50K ultra run 2
- Trail run 4
- Ultra run
- 10K run
- + 4 more races