| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Andrew Whyte | South Otago High School | 52.07q |
| 2 | Tyler Collings | Timaru Boys' High School | 52.26q |
| 3 | William Mohammed | Christ's College | 52.82q |
| 4 | Ethan Campbell | James Hargest High School | 53.45q |
| 5 | Yuma Sekijo | Marlborough Boys College | 53.65 |
| 6 | Tunawut Nitayawan | Burnside High School | 53.87 |
| 7 | Brodie O'Neill | Northern Southland College | 54.20 |
| -- | Martyn Taylor | Shirley Boys High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Alistair Adams | Nelson College | 51.75q |
| 2 | Ben Jowsey | Kaikorai Valley College | 52.76q |
| 3 | Connor Tyndall | Cashmere High School | 53.01q |
| 4 | Jamie Robb | Waitaki Boys' High School | 53.10q |
| 5 | Mike Rasmussen | Lincoln High School | 53.50 |
| 6 | Michael Peterson | James Hargest High School | 53.55 |
| 7 | Greg Redai | Dunstan High School | 53.83 |
| -- | Julian Lagan | St Bede's College | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Tyler Collings | Timaru Boys' High School | 48.31 |
| 2 | Andrew Whyte | South Otago High School | 48.81 |
| 3 | Alistair Adams | Nelson College | 50.62 |
| 4 | Ben Jowsey | Kaikorai Valley College | 50.71 |
| 5 | William Mohammed | Christ's College | 51.48 |
| 6 | Ethan Campbell | James Hargest High School | 52.33 |
| 7 | Connor Tyndall | Cashmere High School | 52.39 |
| 8 | Jamie Robb | Waitaki Boys' High School | 53.62 |