| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Gavin Stark | Blue Mountain | 55.90 |
| 2 | Rodney Bungard | St Kevin's College | 56.11 |
| 3 | Samuel Smith | James Hargest High School | 58.98 |
| 4 | Ethan Sharman | Gore High School | 59.03 |
| 5 | Jordan Cooper | Southland Boys High School | 1:01.08 |
| 6 | Cody Benck | Dunstan | 1:01.62 |
| 7 | Brodie McClelland | St Kevin's College | 1:02.97 |