Boys and girls remain juveniles until the day of their 16th birthday.
| Boys Event | Name | Time | Year |
| 3.5 Miles | M Howard | 9:07 | 2003 |
| 10 Miles | J Churchill | 22:07 | 2016 |
| 15 Miles | J Churchill | 36:56 | 2016 |
| 25 Miles | J Churchill | 59:17 | 2016 |
| 50 Miles | J Churchill | 2:13:12 | 2016 |
| Hill Climb Steyning Bostal | Z Corum-Haines | 4:44 | 2012 |
| Girls Event | Name | Time | Year |
| 10 Miles | Amy Smith | 24:55 | 2014 |