12
100K ultra runs in UK
Find 100k 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.
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- Sat 25 Apr 2026
- £90.50
Prestatyn, Clwyd, UK
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 Jun 2026
- £165
- 4 charities
Chichester, West Sussex, UK
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 2026
- £85-£255
Watlington, Oxfordshire, UK
Race to the Stones
Conquer Britain's oldest trail, the ancient Ridgeway, as you race towards the 5000-year-old Avebury Standing Stones.
- Families
- Recycling
- Newcomers
- Event village
- Rural
- Sustainability policy
- Public transport links
- Age 18 & over
- 50K ultra run 2
- 100K ultra run 3
- Sat 18 - Sun 19 Oct
Skipton, North Yorkshire, UK
Ultra Tour Yorkshire Dales (UTYD) 100K, 50K & 25K Challenge | 100K
- 100 km trail running + 2960 m ascent
- Sat 18 - Sun 19 Oct
High Peak, Derbyshire, UK
High Peak 70/100K Ultra | 100K
- 100 km trail running + 1460 m ascent
- Sun 22 Mar 2026
Sowerby Bridge, West Yorkshire, UK
Canalathon-Ultra Running Festival | 100K
- 100 km road running + 377 m ascent
- Sun 3 May 2026
Shipston-on-Stour, Warwickshire, UK
Tempo Trail Races | 100K Ultra
- 100 km trail running + 6682 ft ascent
- Sat 20 Jun 2026
Hebden Bridge, West Yorkshire, UK
Two Rose Ultra | Two Roses Ultra - 100K
- 100 km multi terrain running + 5175 ft ascent
- Fri 3 - Sat 4 Jul 2026
Epping, Essex, UK
The Full Essex Way Ultra
- 82 miles trail running + 3469 ft ascent