| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Dominik Yanzick | St Kevin's College | 1:04.66q |
| 2 | Jeremy Morris | John McGlashan | 1:05.93q |
| 3 | Kieran O'Connor | Southland Boys High School | 1:07.30q |
| 4 | Brad McDonald | Otago Boys | 1:11.61 |
| -- | Michael Innes | Southland Boys High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Michael Ogle | Otago Boys | 1:02.20q |
| 2 | Ben Jowsey | Kaikorai Valley | 1:02.78q |
| 3 | Ben Dolan | Kings High School | 1:04.61q |
| 4 | Aaron Dykes | Central Southland College | 1:08.07 |
| 5 | Callum Ashley | Aparima College | 1:09.94q |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Ben Jowsey | Kaikorai Valley | 59.55 |
| 2 | Michael Ogle | Otago Boys | 1:01.25 |
| 3 | Ben Dolan | Kings High School | 1:03.20 |
| 4 | Dominik Yanzick | St Kevin's College | 1:04.63 |
| 5 | Kieran O'Connor | Southland Boys High School | 1:04.86 |
| 6 | Jeremy Morris | John McGlashan | 1:05.17 |
| 7 | Callum Ashley | Aparima College | 1:12.04 |