| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Kieran O'Conner | Southland Boys High School | 1:03.31q |
| 2 | Michael Robinson | Menzies College | 1:05.23q |
| 3 | Aaron Dykes | Central Southland College | 1:06.51q |
| 4 | Callum Ashley | Aparima College | 1:07.78q |
| 5 | Chris Lines | James Hargest High School | 1:10.82 |
| -- | Simon Watt | Central Southland College | NT |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Lucas Roughan | St Peter's College (Gore) | 1:03.89q |
| 2 | Michael Innes | Southland Boys High School | 1:05.73q |
| 3 | Hamish Rose | Central Southland College | 1:07.30q |
| 4 | Cormack Brayden | Menzies College | 1:08.13q |
| 5 | Jesse Barclay | Menzies College | 1:08.20 |
| -- | Regan Bennett | Tuatapere Community College | NT |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Michael Innes | Southland Boys High School | 1:03.07 |
| 2 | Kieran O'Conner | Southland Boys High School | 1:03.14 |
| 3 | Aaron Dykes | Central Southland College | 1:05.37 |
| 4 | Callum Ashley | Aparima College | 1:05.75 |
| 5 | Lucas Roughan | St Peter's College (Gore) | 1:06.28 |
| 6 | Hamish Rose | Central Southland College | 1:07.42 |
| 7 | Michael Robinson | Menzies College | 1:08.97 |
| 8 | Cormack Brayden | Menzies College | 1:14.63 |