| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Elliot Harvey | Marlborough Boys College | 56.98q |
| 2 | Adin Martinus | Greymouth High School | 58.18q |
| 3 | Michael Ogle | Otago Boys High School | 58.59q |
| 4 | Ben Dolan | Kings High School | 1:00.02q |
| 5 | Joseph Maeg | Hornby High School | 1:01.20 |
| 6 | Dominik Yanzick | St Kevin's College | 1:03.78 |
| -- | Mark Benny | Mountainview High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Aaron Williams | Golden Bay High School | 57.03q |
| 2 | Francis Donaldson | St Bede's College | 58.72q |
| 3 | Nick Rapana | Papanui High School | 58.76q |
| 4 | Sam Bell | St Thomas Of Canterbury Colleg | 58.90q |
| 5 | Prateek Atwal | Lincoln High School | 1:05.35 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Elliot Harvey | Marlborough Boys College | 55.54 |
| 2 | Francis Donaldson | St Bede's College | 57.24 |
| 3 | Michael Ogle | Otago Boys High School | 57.40 |
| 4 | Adin Martinus | Greymouth High School | 57.86 |
| 5 | Nick Rapana | Papanui High School | 59.34 |
| 6 | Ben Dolan | Kings High School | 59.80 |
| 7 | Sam Bell | St Thomas Of Canterbury Colleg | 1:00.13 |
| -- | Aaron Williams | Golden Bay High School | DNS |