| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Toby Obafemi | Ashburton College | 53.26q |
| 2 | Tim Wilkinson | Otago Boys High School | 53.55q |
| 3 | Glen Beadle | Taieri College | 53.58q |
| 4 | Tim Manson | Christ's College | 54.01q |
| 5 | Cameron Mitchell | St Andrew's College | 54.37 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Brandon Spencer | Southland Boys High School | 53.39q |
| 2 | Ben Speden | St Peter's College (Gore) | 54.22q |
| 3 | Kalum Martinus | Greymouth High School | 54.24q |
| 4 | Loren Burnett | Burnside High School | 54.26q |
| 5 | Alan Stringer | Northern Southland College | 54.43 |
| 6 | Sam Vereker-Bindon | Timaru Boys' High School | 54.60 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Brandon Spencer | Southland Boys High School | 49.62 |
| 2 | Glen Beadle | Taieri College | 52.86 |
| 3 | Tim Wilkinson | Otago Boys High School | 53.51 |
| 4 | Toby Obafemi | Ashburton College | 53.63 |
| 5 | Kalum Martinus | Greymouth High School | 54.23 |
| 6 | Tim Manson | Christ's College | 54.94 |
| 7 | Ben Speden | St Peter's College (Gore) | 55.84 |
| 8 | Loren Burnett | Burnside High School | 56.06 |