| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Thomas Martin | St Bede's College | 55.60q |
| 2 | Archie McBride | St Bede's College | 56.52q |
| 3 | Morgan Thomson | Timaru Boys' High School | 57.25q |
| 4 | Luke Gough | Ellesmere College | 58.21 |
| -- | Taylor Garrett | Otago Boys High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Samuel Gilchrist | Christ's College | 54.51q |
| 2 | DJ Kilden | Christchurch Boys High School | 55.29q |
| 3 | Ed Davies | John McGlashan College | 56.21q |
| 4 | Jethro Palmer | Geraldine High School | 56.51q |
| 5 | Isaac Williamson | East Otago High School | 57.34q |
| 6 | Jack Bloomfield | Otago Boys High School | 57.80 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Thomas Martin | St Bede's College | 51.67 |
| 2 | DJ Kilden | Christchurch Boys High School | 53.39 |
| 3 | Samuel Gilchrist | Christ's College | 53.60 |
| 4 | Jethro Palmer | Geraldine High School | 54.74 |
| 5 | Ed Davies | John McGlashan College | 56.16 |
| 6 | Archie McBride | St Bede's College | 56.62 |
| 7 | Isaac Williamson | East Otago High School | 57.41 |
| 8 | Morgan Thomson | Timaru Boys' High School | 57.80 |