| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Kane Attrill | Kings High School | 23.20 |
| 2 | Jack Allan | St Kevin's College | 23.50 |
| 3 | Dylan Lovett | James Hargest High School | 23.80 |
| 4 | Patrick Hamer | Otago Boys | 24.20 |
| 5 | Mathew Kane | Central Southland College | 24.40 |
| 6 | Tyler Helm | Otago Boys | 24.70 |
| 7 | Michael Peterson | James Hargest High School | 24.90 |
| -- | Nathan Frisby | Southland Boys High School | DNS |