| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Rhian Douglas | Waimea College | 53.91q |
| 2 | Conner Woodcock | Rolleston College | 1:00.34q |
| 3 | Patrick Dawson | Roncalli College | 1:01.00q |
| 4 | Alex Lascelles | Christ's College | 1:01.28q |
| -- | Riley Horne | Otago Boys High School | DQ |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ollie Jackways | St Andrew's College | 58.25q |
| 2 | Hudson Garratt | Middleton Grange School | 59.99q |
| 3 | Jayden Dawson | James Hargest College | 1:01.73q |
| 4 | Jude Smillie | Otago Boys High School | 1:02.82q |
| 5 | Alex Kenure-Blackley | Ashburton College | 1:04.23 |
| 6 | Odin Bartlett | James Hargest College | 1:06.60 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Rhian Douglas | Waimea College | 52.58 |
| 2 | Ollie Jackways | St Andrew's College | 56.45 |
| 3 | Conner Woodcock | Rolleston College | 58.30 |
| 4 | Patrick Dawson | Roncalli College | 59.34 |
| 5 | Hudson Garratt | Middleton Grange School | 59.79 |
| 6 | Jayden Dawson | James Hargest College | 1:01.75 |
| 7 | Alex Lascelles | Christ's College | 1:04.22 |
| -- | Jude Smillie | Otago Boys High School | DNS |