| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | John Wells | Christ's College | 53.70q |
| 2 | Logan McCrae | Garin College | 54.05q |
| 3 | Jed Thompson-Fawcett | John McGlashan College | 54.79q |
| 4 | Finn McLachlan | Burnside High School | 55.46 |
| 5 | Jaden Meynell | Waimate High School | 57.00 |
| -- | Arthur Holden | Mackenzie College | SCR |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Jack Rodgers | Christchurch Boys High School | 51.79q |
| 2 | louie Howell | Cashmere High School | 52.79q |
| 3 | Josh Hou | John McGlashan College | 53.07q |
| 4 | Luke Barrett | Rolleston College | 53.60q |
| 5 | Thomas Sullivan | John McGlashan College | 54.66q |
| 6 | Apisalome Sikaldoka | Timaru Boys' High School | 55.76 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Jack Rodgers | Christchurch Boys High School | 50.88 |
| 2 | louie Howell | Cashmere High School | 51.20 |
| 3 | John Wells | Christ's College | 51.82 |
| 4 | Josh Hou | John McGlashan College | 52.10 |
| 5 | Luke Barrett | Rolleston College | 53.06 |
| 6 | Logan McCrae | Garin College | 53.54 |
| 7 | Jed Thompson-Fawcett | John McGlashan College | 53.87 |
| 8 | Thomas Sullivan | John McGlashan College | 54.10 |