100K ultra runs in UK
Find 100k ultra runs near me in UK for 2025/2026 - filter by date or location, display on a map or use the advanced search to find your perfect race.
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- Sat 6 - Sun 7 Sep
- £199
- Entries close soon
- Sat 6 - Sun 7 Sep
- £199
- Entries close soon
South Coast Ultra Challenge | Full 100km continuous
The full distance option of the South Coast Challenge from sunny Eastbourne, over the magnificent Seven Sisters, onto Cuckmere Haven and over the South Downs all the way to historic Arundel.
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 2100 m ascent
- Sat 6 - Sun 7 Sep
- £199
- Entries close soon
- Sat 6 - Sun 7 Sep
- £199
- Entries close soon
South Coast Ultra Challenge | Full 100km over 2 days
The full distance option of the South Coast Challenge over 2 days with 57km on day 1 and 43km on day 2, meaning you experience the route in daylight with the chance to sleep overnight.
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 2100 m ascent
- Sat 13 - Sun 14 Sep
- £199
- 17 charities
- Sat 13 - Sun 14 Sep
- £199
- 17 charities
Thames Path Ultra Challenge | Full 100km Continuous
The full, non-stop option of the epic Thames Path Challenge from leafy South West London following the river to Hampton Court, Runnymede to finish at Henley-on-Thames for a celebratory finish and BBQ!
- Chip timing
- Enter online
- GPS tracking
- Flat
- Undulating
- Age 18 & over
- 100 km trail running + 350 m ascent
- Sat 13 - Sun 14 Sep
- £199
- 17 charities
- Sat 13 - Sun 14 Sep
- £199
- 17 charities
Thames Path Ultra Challenge | Full 100km over 2 days
An epic challenge from leafy South West London on the River Thames featuring Hampton Court, Runnymede of Magna Carta Fame, Henley-on-Thames and a fabulous celebration finish - all in daylight.
- Chip timing
- Enter online
- GPS tracking
- Flat
- Age 18 & over
- 100 km trail running + 350 m ascent
- Fri 19 Sep
- £80
- Fri 19 Sep
- £80
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 25 Apr 2026
- £90.50
- Sat 25 Apr 2026
- £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 Jun 2026
- £150
- 3 charities
- Sat 20 Jun 2026
- £150
- 3 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 Jul 2026
- £175
- 6 charities
- Sat 11 Jul 2026
- £175
- 6 charities
Race to the Stones | 100K Non-stop
Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 3704 ft ascent
- Sat 11 Jul 2026
- £245
- 3 charities
- Sat 11 Jul 2026
- £245
- 3 charities
Race to the Stones | 100K Over Two Days
Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 3704 ft ascent
- Sat 11 Jul 2026
- £155
- Sat 11 Jul 2026
- £155
Race to the Stones | 100K Two Days no camping
Explore the Ridgeway, Britain’s oldest road, along a remarkably isolated and unspoilt corner of Southern England with sweeping chalk downs, ancient forests and the Avebury Standing Stones.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 3704 ft ascent
- Sat 9 Aug
Stour Valley Path Ultra Run | 100K
- 100 km trail running + 912 m ascent
- Sat 16 - Sun 17 Aug
Foxton Hound Ultras | 100K
- 100 km trail running + 1035 m ascent
- Sun 22 Mar 2026
Canalathon-Ultra Running Festival | 100K
- 100 km road running + 377 m ascent
- Sun 3 May 2026
Tempo Trail Races | 100K Ultra
- 100 km trail running + 6682 ft ascent