| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| -- | Byron Munro | Mackenzie College | q |
| -- | Sione Pulu | Waitaki Boys' High School | q |
| -- | Vinnie Purcell | Mountainview High School | q |
| -- | Sam Vereker-Bindon | Timaru Boys' High School | q |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| -- | Simon Bunckenburg | Roncalli College | q |
| -- | Robert Lord | Timaru Boys' High School | q |
| -- | Toby Obafemi | Ashburton College | q |
| -- | Blair Ritchie | Opihi College | |
| -- | Tom Verdonk | Waitaki Boys' High School | q |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Sam Vereker-Bindon | Timaru Boys' High School | 54.20 |
| 2 | Robert Lord | Timaru Boys' High School | 54.60 |
| 3 | Toby Obafemi | Ashburton College | 55.00 |
| -- | Simon Bunckenburg | Roncalli College | NT |
| -- | Byron Munro | Mackenzie College | NT |
| -- | Sione Pulu | Waitaki Boys' High School | NT |
| -- | Vinnie Purcell | Mountainview High School | NT |
| -- | Tom Verdonk | Waitaki Boys' High School | NT |