| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Clay Forward | John McGlashan | 55.84 |
| 2 | Regan Bennett | Tuatapere Community College | 56.61 |
| 3 | Ethan Campbell | James Hargest High School | 57.55 |
| 4 | James Park | East Otago High School | 58.11 |
| 5 | Sam Logie | Aparima College | 58.32 |
| 6 | Michael Peterson | James Hargest High School | 58.73 |
| 7 | Daniel Oldham | East Otago High School | 59.12 |
| 8 | Kahil McQueen | Otago Boys | 1:00.21 |