| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Tomi Obafemi | Ashburton College | 54.94q |
| 2 | Chad Butson | Southland Boys High School | 56.11q |
| 3 | Callum Webber | Nayland College | 58.23q |
| 4 | Ben Evans | St Bede's College | 58.43q |
| 5 | Brandon Ruffell | Roncalli College | 59.54 |
| 6 | Slade McGill | Amuri Area School | 59.64 |
| 7 | Danny Moore | Papanui High School | 1:03.94 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Alex Jordan | Nayland College | 53.38q |
| 2 | Damon Cleverley | Logan Park High School | 58.22q |
| 3 | Tim Smith | St Bede's College | 58.96q |
| 4 | Keegan Watson | Otago Boys High School | 59.26q |
| 5 | Joshua Vergeer | Burnside High School | 59.59 |
| 6 | Robere Hall | Kings High School | 1:02.55 |
| 7 | Frank Offen | John McGlashan | 1:04.47 |
| -- | Neil Hill | Waitaki Boys' High School | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Tomi Obafemi | Ashburton College | 54.77 |
| 2 | Damon Cleverley | Logan Park High School | 55.82 |
| 3 | Callum Webber | Nayland College | 58.39 |
| 4 | Keegan Watson | Otago Boys High School | 59.42 |
| 5 | Ben Evans | St Bede's College | 59.98 |
| -- | Chad Butson | Southland Boys High School | DNS |
| -- | Alex Jordan | Nayland College | DQ |
| -- | Tim Smith | St Bede's College | DNS |