| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Jackson Rouland | Waimea College | 59.13q |
| 2 | Paul Casey | Ashburton College | 1:00.53q |
| 3 | J Millan | Menzies College | 1:00.56q |
| 4 | Thomas Mitchell | Timaru Boys' High School | 1:00.62q |
| -- | Finn Tieasdale | The Taieri High School | DNS |
| -- | Brad Van Der Loo | South Otago High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Luke Fowler | Geraldine High School | 1:01.21q |
| 2 | SAM CORDY | St Andrew's College | 1:01.82q |
| 3 | FRASER HENDERSON | Christ's College | 1:03.30q |
| 4 | PATRICK WONG | Burnside High School | 1:03.77q |
| 5 | KIRK MANSFIELD | Shirley Boys High School | 1:03.81 |
| 6 | Karl Bonniface | Garin College | 1:05.37 |
| -- | ELLIOT DIXON | St Bede's College | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Jackson Rouland | Waimea College | 59.79 |
| 2 | J Millan | Menzies College | 1:00.11 |
| 3 | FRASER HENDERSON | Christ's College | 1:00.54 |
| 4 | Thomas Mitchell | Timaru Boys' High School | 1:01.75 |
| 5 | SAM CORDY | St Andrew's College | 1:02.53 |
| 6 | Paul Casey | Ashburton College | 1:03.45 |
| 7 | Luke Fowler | Geraldine High School | 1:03.80 |
| 8 | PATRICK WONG | Burnside High School | 1:05.12 |