| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ben Collerton | St Andrew's College | 59.78q |
| 2 | Ryan Livesay | Taieri College | 1:00.42q |
| 3 | Liam Finnie | Otago Boys High School | 1:01.26q |
| 4 | Mitchell Kelly | Otago Boys High School | 1:02.76 |
| -- | Matthew McLellan | Waitaki Boys' High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Jordan Pinnock | Greymouth High School | 57.86q |
| 2 | Jesse Houston | Mt Hutt College | 58.85q |
| 3 | Tom Maslin | St Bede's College | 59.52q |
| 4 | Connor O'Neill | James Hargest High School | 59.68q |
| 5 | Alex Mander | Mairehau High School | 59.73q |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Jordan Pinnock | Greymouth High School | 56.42 |
| 2 | Jesse Houston | Mt Hutt College | 57.89 |
| 3 | Alex Mander | Mairehau High School | 59.58 |
| 4 | Ryan Livesay | Taieri College | 59.87 |
| 5 | Ben Collerton | St Andrew's College | 1:00.26 |
| 6 | Tom Maslin | St Bede's College | 1:00.77 |
| 7 | Connor O'Neill | James Hargest High School | 1:01.51 |
| 8 | Liam Finnie | Otago Boys High School | 1:01.73 |