100K ultra runs in Wales
Find 100k ultra runs near me in Wales 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 26 Apr
- £84.50
- Sat 26 Apr
- £84.50
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
- 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
- Sat 19 - Sun 20 Jul
- £199
- 7 charities
- Sat 19 - Sun 20 Jul
- £199
- 7 charities
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
- 7 charities
- Sat 19 - Sun 20 Jul
- £199
- 7 charities
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