Race statistics
DNF Rates: The 30 Toughest Races to Finish
DNF rate is the percentage of starters who did not finish, using only participants recorded as finished or DNF. Only races with at least 50 recorded starters are included, so the rates below are statistically meaningful.
| # | Race | Location | Distance | Starters | DNF Rate |
|---|---|---|---|---|---|
| 1 | UTS 165 | - | - | 92 | 65% |
| 2 | 13 Valleys Ultra | - | - | 192 | 59% |
| 3 | Dragon's Back Race | Wales, United Kingdom | 380km | 1,411 | 55% |
| 4 | Conwy Half Marathon | Conwy, Wales | 21.1km | 6,156 | 55% |
| 5 | C2C in a Day | - | - | 1,927 | 52% |
| 6 | Devon Coast to Coast - 180km | South Hams, England | 173.9km | 52 | 50% |
| 7 | Cape Wrath Ultra | - | - | 1,149 | 48% |
| 8 | Pilgrims Ultra - 100 Mile | Holy Island, England | 160.9km | 91 | 47% |
| 9 | Hardmoors 110 | - | 173.6km | 214 | 47% |
| 10 | Montane Spine Challenger South - Summer Edition | High Peak, England | 174.32km | 313 | 46% |
| 11 | Montane Spine - Summer Edition | - | - | 1,010 | 46% |
| 12 | Summer Spine | - | - | 91 | 46% |
| 13 | Hardmoors 160 | Cold Kirby, England | 247.65km | 339 | 44% |
| 14 | Salomon Ben Nevis Ultra | - | - | 229 | 44% |
| 15 | UTS 100 | - | - | 181 | 43% |
| 16 | Summer Spine Challenger Race | - | - | 111 | 39% |
| 17 | Essex Way Ultra | Epping Forest, England | 132.46km | 104 | 39% |
| 18 | Lakeland 100 | Coniston, England | 168.89km | 3,907 | 37% |
| 19 | 100 km Pilgrims Ultra | Holy Island, England | 99.91km | 205 | 36% |
| 20 | Montane Spine Challenger North - Summer Edition | Hawes, England | 242.57km | 118 | 36% |
| 21 | Hardmoors 60 | Guisborough, England | 100.58km | 950 | 35% |
| 22 | The Fellsman | - | - | 204 | 34% |
| 23 | Ultra Trail Snowdonia 100km | Snowdon, Wales | 100km | 1,189 | 33% |
| 24 | Montane Summer Spine | Edale, England | 431.304km | 480 | 33% |
| 25 | Saint Cuthbert's Way 100 KM | Melrose, Scotland | 102.24km | 421 | 31% |
| 26 | The Ridgeway Challenge | Ivinghoe Aston, England | 139.9km | 407 | 30% |
| 27 | Ultra Great Britain | - | - | 63 | 29% |
| 28 | LAW 75 | - | - | 172 | 28% |
| 29 | Wales Ultra Trail | - | - | 169 | 28% |
| 30 | North Coast 110 Mile Ultra | Torridge District, England | 170.18km | 81 | 27% |