| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Nat Kirk | Whanganui High School | 42.16q |
| 2 | Finn O'Sullivan | Christchurch Boys High School | 43.91q |
| 3 | Max Van Der Westhuizen | St Peter's College (Auckland) | 44.15q |
| 4 | James Hansen | Marlborough Boys College | 45.40q |
| 5 | Joseph Dunn | Kings College | 47.71 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Amilame Finau | St John's College | 43.34q |
| 2 | Jack Mitchell | Kings College | 43.66q |
| 3 | Thomas Leske | Rathkeale College/Trinity Seni | 44.91q |
| 4 | Samuel Warren | Macleans College | 45.66q |
| 5 | Wiremu Ngamotu | Avondale College | 46.57 |
| 6 | William Cole | Rathkeale College/Trinity Seni | 47.39 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Nat Kirk | Whanganui High School | 41.54 |
| 2 | Amilame Finau | St John's College | 42.11 |
| 3 | Finn O'Sullivan | Christchurch Boys High School | 42.55 |
| 4 | Max Van Der Westhuizen | St Peter's College (Auckland) | 42.63 |
| 5 | Jack Mitchell | Kings College | 42.95 |
| 6 | James Hansen | Marlborough Boys College | 44.12 |
| 7 | Samuel Warren | Macleans College | 44.94 |
| 8 | Thomas Leske | Rathkeale College/Trinity Seni | 45.02 |