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.
- Chip timing
- Enter online
- GPS tracking
- Age 18 & over
- 100 km trail running + 8000 ft ascent
- Sat 20 - Sun 21 Jun
- £49-£199
North Yorks Ultra Challenge
Set to be one of the greatest Ultra Challenges – basecamp is in Scarborough – famous for its Fair, and a popular seaside spa since the 17th century.
- Beginner-friendly
- Event village
- Age 16 & over
- 100K ultra run 2
- 50K ultra run 2
- Trail run
- 10 miler
- Sat 20 Jun
- £175
- 2 charities
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.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 1510 m ascent
- 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.
- Chip timing
- Enter online
- Mountainous
- Traffic free
- Relay
- Age 18 & over
- 24 hrs trail running + 3182 ft ascent
- Fri 18 Sep
- £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.
- Enter online
- GPS tracking
- Hilly
- Age 20 & over
- 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.
- Enter online
- GPS tracking
- Mountainous
- Age 18 & over
- 106 km trail running + 6350 m ascent
- Sun 22 Mar
Canalathon-Ultra Running Festival | 100K
- 100 km road running + 377 m ascent
- Sun 3 May
Tempo Trail Races | 100K Ultra
- 100 km trail running + 6682 ft ascent
- Sat 16 - Sun 17 May
Jurassic Coast Ultra Challenge
- Trail run 2
- 50K ultra run 2
- 100K ultra run 2
- Marathon
- Ultra run
- + 1 more race
- Sat 6 - Sun 7 Jun
Lake District Ultra Challenge
- Trail run 2
- 50K ultra run 2
- 100K ultra run 2
- Marathon
- Sat 20 Jun
Two Rose Ultra | Two Roses Ultra - 100K
- 100 km multi terrain running + 5175 ft ascent
- Fri 3 - Sat 4 Jul
The Full Essex Way Ultra
- 82 miles trail running + 3469 ft ascent
- Fri 11 - Sun 13 Sep
Thames Path Ultra Challenge
- 100K ultra run 2
- 50K ultra run 2
- Trail run 4
- Ultra run
- 10K run
- + 4 more races