The 20 100K ultramarathons in United Kingdom, with each one's climb, cutoff and date. Every race links to its own page, where you can see how it fits the runner you are now.
| Race | Distance | Where | Date | Climb | Cutoff |
|---|---|---|---|---|---|
| Devon Coast To Coast Ultra | 100km | Wembury, United Kingdom | Apr 17, 2027 | 6,644 ft | 25 h |
| North Wales | 100km | Prestatyn, United Kingdom | Apr 24, 2027 | 7,999 ft | 18 h |
| Chiltern Hills 100K | 100km | Chesham, United Kingdom | May 8, 2027 | 5,906 ft | 18 h |
| Epona 100 Miler | 100km | Abergavenny, United Kingdom | May 8, 2027 | 10,000 ft | 30 h |
| London 2 Brighton Challenge | 100km | Richmond, United Kingdom | May 29, 2027 | 4,921 ft | 33 h |
| Jurassic Extinction 105mi Ultra | 104 km | Poole, United Kingdom | Jun 19, 2027 | 8,858 ft | 24 h |
| North Yorks Challenge | 100 km | Scarborough, United Kingdom | Jun 19, 2027 | 3,281 ft | 24 h |
| Race to the King | 103 km | Goodwood, United Kingdom | Jun 19, 2027 | 4,888 ft | 30 h |
| Jurassic Coast 50km Ultra | 100km | Lyme Regis, United Kingdom | Jun 20, 2027 | 9,514 ft | 25 h |
| Serpent Trail Race | 100km | Petersfield, United Kingdom | Jul 3, 2027 | 5,856 ft | 18 h |
| Ultra-Trail Gower Peninsula | 100 km | Llanrhidian, United Kingdom | Jul 9, 2027 | 6,414 ft | 24 h |
| Race to the Stones 100km Non-Stop | 100km | Lewknor, United Kingdom | Jul 10, 2027 | 3,704 ft | 28 h |
| St. Cuthbert's Way 100 km Ultra | 100km | Melrose, United Kingdom | Jul 10, 2027 | 8,061 ft | 19 h |
| Beacons Way Ultra 100 | 62mi | Abergavenny, United Kingdom | Jul 24, 2027 | 10,400 ft | 24 h |
| South West Coast 50 Challenge | 100 km | Dunster, United Kingdom | Jul 24, 2027 | 7,021 ft | 24 h |
| Foxton Hound Ultra | 104km | Market Harborough, United Kingdom | Aug 14, 2027 | 3,412 ft | 18 h |
| Speyside Way Ultra | 100km | Aberlour, United Kingdom | Aug 14, 2027 | 4,081 ft | 18 h |
| Run the Borders | 109km | Melrose, United Kingdom | Aug 21, 2027 | 6,234 ft | 20 h |
| Peak District Challenge - Gold Ultra | 100km | Hathersage, United Kingdom | Sep 17, 2027 | 10,827 ft | 24 h |
| Triple Trail | 100km | Linton, United Kingdom | Sep 18, 2027 | 5,433 ft | 18 h |