| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Jayden Webb-Milner | Rathkeale College/Trinity Seni | 43.26q |
| 2 | Finn O'Sullivan | Christchurch Boys High School | 43.41q |
| 3 | Vincent Ye | Whanganui High School | 44.34 |
| 4 | Henry Russon | Motueka High School | 44.65 |
| 5 | Alex van Oeveren | Havelock North High School | 46.15 |
| 6 | Folau Havea | Middleton Grange School | 46.91 |
| -- | Lee Lober Chan | Auckland Grammar School | DQ |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ben Strang | St Pauls Collegiate (Hamilton) | 41.27q |
| 2 | John Wells | Christ's College | 41.74q |
| 3 | Karl Loebe | Whanganui High School | 41.77q |
| 4 | Adam Stack | Waimea College | 41.96q |
| 5 | Liam McKee | Hamilton Boys High School | 41.98 |
| 6 | Leiukamea Schaaf | Sacred Heart College (Auckland | 45.02 |
| 7 | Sam Hainsworth-Faaofo | Auckland Grammar School | 46.53 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Cameron Moffitt | Otago Boys High School | 41.13q |
| 2 | Zachary Saunders | Botany Downs Secondary College | 42.06q |
| 3 | Joshua Penney | Auckland Grammar School | 42.53 |
| 4 | Tony Su | Macleans College | 42.54 |
| 5 | John Mottus | Rolleston College | 42.86 |
| 6 | John McLean | St Peter's School | 43.36 |
| 7 | Thomas Leske | Rathkeale College/Trinity Seni | 44.95 |
| 8 | Jack Mitchell | Kings College | 45.02 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Cameron Moffitt | Otago Boys High School | 39.45 |
| 2 | Ben Strang | St Pauls Collegiate (Hamilton) | 40.75 |
| 3 | Adam Stack | Waimea College | 41.53 |
| 4 | Karl Loebe | Whanganui High School | 41.66 |
| 5 | Zachary Saunders | Botany Downs Secondary College | 43.42 |
| 6 | Finn O'Sullivan | Christchurch Boys High School | 43.67 |
| 7 | Jayden Webb-Milner | Rathkeale College/Trinity Seni | 44.57 |
| -- | John Wells | Christ's College | DQ |