100K ultra runs in UK
Find 100k ultra runs near me in UK for 2025/2026 - search by date or place, display on a map or use the advanced search to find your perfect race.
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Click an event for full event details, location, route, sustainability, what's included and how to enter.
- Sat 21 Jun
- £170-£180
- Entries closed
- Sat 21 Jun
- £170-£180
- Entries closed
Race to the King | 100K
Take on the full 100K Race to the King ultra marathon challenge in one go. Fully supported through day and night on a route combining castles and coastal scenery.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 4619 ft ascent
- Sat 21 - Sun 22 Jun
- £199
- Entries closed
- Sat 21 - Sun 22 Jun
- £199
- Entries closed
Cotswold Way Ultra Challenge | Full 100km continuous
Head into the rolling green hills of the Cotswolds with leg-testing climbs and breathtaking views on your 100km mission, with stops every 12-13km and a halfway break in Wotton, you're fully supported.
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 2250 m ascent
- Sat 21 - Sun 22 Jun
- £199
- Entries closed
- Sat 21 - Sun 22 Jun
- £199
- Entries closed
Cotswold Way Ultra Challenge | Full 100km over 2 days
Head into the rolling green hills of the Cotswolds with leg-testing climbs and breathtaking views on your 100km mission in daylight only with the benefit of a mid-way break and good night's sleep.
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 2250 m ascent
- Sat 28 - Sun 29 Jun
- £199
- Sat 28 - Sun 29 Jun
- £199
Peak District Ultra Challenge | Full 100km continuous
Take on the full 100km in a figure-of-eight route through the north and south of the Peak District with stops every 12-13km and whatever support you need to get you to the finish line celebration!
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 2150 m ascent
- Sat 28 - Sun 29 Jun
- £199
- Sat 28 - Sun 29 Jun
- £199
Peak District Ultra Challenge | Full 100km over 2 days
Take on the full 100km in a figure-of-eight route through the north and south of the Peak District in daylight with a good night's rest and full support to get you to the finish line celebration!
- Chip timing
- Enter online
- Undulating
- Hilly
- Age 18 & over
- 100 km trail running + 2150 m ascent
- Sat 12 Jul
- £180-£190
- Entries close soon
- Sat 12 Jul
- £180-£190
- Entries close soon
Race to the Stones | 100K Non-stop
Take on the full 100K ultramarathon in one go. Fully supported through day and night on an incredibly scenic and historic route to finish at the 5000-year-old Avebury standing stones.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 3704 ft ascent
- Sat 12 Jul
- £260-£270
- Entries close soon
- Sat 12 Jul
- £260-£270
- Entries close soon
Race to the Stones | 100K Two Days with camping
Take on the full 100K Race to the Stones ultramarathon with an overnight stop at the all-inclusive Basecamp, meaning a good nights' sleep in between the 50K stints.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 3704 ft ascent
- Sat 12 Jul
- £170-£180
- Entries close soon
- Sat 12 Jul
- £170-£180
- Entries close soon
Race to the Stones | 100K Two Days no camping
Take on the full Race to the Stones 100K ultramarathon over two days, making your own arrangements for overnight accommodation at the halfway point (ideal if you'd prefer not to camp).
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Age 18 & over
- 100 km trail running + 3704 ft ascent
- Sat 12 - Sun 13 Jul
- £121.99-£251.99
- Sat 12 - Sun 13 Jul
- £121.99-£251.99
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
- Relay
- Age 18 & over
- 24 hrs trail running + 3182 ft ascent
- Sat 19 - Sun 20 Jul
- £199
- Entries close tomorrow
- Sat 19 - Sun 20 Jul
- £199
- Entries close tomorrow
Gower Peninsula Ultra Challenge | Full Continuous 100K
A magnificent challenge from Penrice Castle featuring a figure-of-eight route, Oxwich Bay, the stunning Wales Coast Path, the Gower Way, Mumbles Head, Gowerton and a massive welcome celebration too!
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km multi terrain running + 2200 m ascent
- Sat 19 - Sun 20 Jul
- £199
- Entries close tomorrow
- Sat 19 - Sun 20 Jul
- £199
- Entries close tomorrow
Gower Peninsula Ultra Challenge | Full 2 Day Daylight 100K
A magnificent challenge from Penrice Castle featuring a figure-of-eight route, Oxwich Bay, the stunning Wales Coast Path, the Gower Way, Mumbles Head, Gowerton with a good night's sleep mid-way.
- Chip timing
- Enter online
- Hilly
- Age 18 & over
- 100 km multi terrain running + 2200 m ascent
- Sat 6 - Sun 7 Sep
- £199
- 14 charities
- Sat 6 - Sun 7 Sep
- £199
- 14 charities
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
- 13 charities
- Sat 6 - Sun 7 Sep
- £199
- 13 charities
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 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