100K ultra runs in UK in May 2025
Find 100k ultra runs near me in UK in May 2025 - search by date or place, display on a map or use the advanced search to find your perfect race.
Search by month
Search by place
MapEvents near me
Click an event for full event details, location, route, sustainability, what's included and how to enter.
- Sat 3 May
- £199
- Sat 3 May
- £199
Isle of Wight Ultra Challenge | Full Continuous
Great challenges need great settings, and up to 2,000 adventurers will take on the Isle of Wight stunning coastal path – all out to push themselves further.
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Hilly
- Age 18 & over
- 106 km multi terrain running + 1800 m ascent
- Sat 3 - Sun 4 May
- £199
- Sat 3 - Sun 4 May
- £199
Isle of Wight Ultra Challenge | Full 2 Day Daylight
The full 106km circumnavigation of the Isle of Wight, in daylight hours. Overnight at Cowes for a well-earned rest on this wonderful exploration of the coastal routes around the island.
- Chip timing
- Enter online
- Undulating
- Hilly
- Age 18 & over
- 106 km multi terrain running + 1960 m ascent
- Sat 3 May
- £75-£77
- Sat 3 May
- £75-£77
ATW Mallory Race Circuit 100K
Get ready for the challenge of a lifetime at the Mallory Park 100K race! A unique and thrilling chance to race on the same legendary motor racing circuit that once hosted a Formula 1 event!
- Enter online
- Flat
- Traffic free
- Age 20 & over
- 100 km multi terrain running
- Sat 17 - Sun 18 May
- £199
- Sat 17 - Sun 18 May
- £199
Jurassic Coast Ultra Challenge | Full 100km continuous
A demanding challenge, taking on 100km along the UNESCO World Heritage Jurassic Coast, starting from Corfe Castle on a fully-supported challenge visiting the highlights of the region.
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 2300 m ascent
- Sat 17 - Sun 18 May
- £199
- Sat 17 - Sun 18 May
- £199
Jurassic Coast Ultra Challenge | Full 100km over 2 days
Walk, jog or run along the spectacular UNESCO World Heritage coastline from Corfe Castle past Lulworth Cove and Durdle Door, with full support, welcoming base camp and finish line celebration!
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 2300 m ascent
- Sat 24 May
- £199
- Entries close today
- Sat 24 May
- £199
- Entries close today
London 2 Brighton Ultra Challenge | Full 100km Continuous
Leafy Richmond to sunny Brighton – over the North Downs and the South Downs, with some wonderful Surrey and Sussex countryside in between, fully supported all the way with a huge celebratory finish!
- Chip timing
- Enter online
- GPS tracking
- Hilly
- Age 18 & over
- 100 km trail running + 1500 m ascent
- Sat 24 - Sun 25 May
- £199
- Entries close today
- Sat 24 - Sun 25 May
- £199
- Entries close today
London 2 Brighton Ultra Challenge | Full 100km over 2 days
Leafy Richmond to sunny Brighton, over the North and South Downs, with some wonderful Surrey and Sussex countryside - all in daylight hours and with a good nights' sleep mid-way!
- Chip timing
- Enter online
- GPS tracking
- Undulating
- Hilly
- Age 18 & over
- 100 km trail running + 1500 m ascent
- Sat 17 May
Devon Coast to Coast Ultra Marathon | Devon 100K (Mid Devon and Exmoor)
- 100 km trail running