| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Riley McDowell | Central Southland College | 1:02.17q |
| 2 | Metua Aerenga | Southland Boys High School | 1:03.23q |
| 3 | Dean Henderson | James Hargest High School | 1:07.16q |
| 4 | Josh Watkinson | Central Southland College | 1:12.72 |
| -- | Joe Gollan | Gore High School | SCR |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Simon Van Dam | Tuatapere Community College | 1:00.71q |
| 2 | Mattew Heads | Southland Boys High School | 1:02.49q |
| 3 | Samuel Smith | James Hargest High School | 1:02.97q |
| 4 | Tyler Jones | Central Southland College | 1:05.18q |
| 5 | Ethan Sharman | Gore High School | 1:06.92q |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Simon Van Dam | Tuatapere Community College | 1:02.16 |
| 2 | Samuel Smith | James Hargest High School | 1:02.85 |
| 3 | Ethan Sharman | Gore High School | 1:04.09 |
| 4 | Riley McDowell | Central Southland College | 1:04.77 |
| 5 | Metua Aerenga | Southland Boys High School | 1:11.89 |
| -- | Mattew Heads | Southland Boys High School | DNS |
| -- | Dean Henderson | James Hargest High School | SCR |
| -- | Tyler Jones | Central Southland College | SCR |