| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Tim Manson | Christ's College | 53.86q |
| 2 | Cameron Mitchell | St Andrew's College | 54.20q |
| 3 | Simon Morse | Cashmere High School | 56.91q |
| 4 | Hamish Upton | Burnside High School | 58.76q |
| -- | Tim Couprie | Middleton Grange | DNS |
| -- | Jason Morgan | St Bede's College | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Michael Scally | St Bede's College | 55.71q |
| 2 | Loren Burnett | Burnside High School | 57.55q |
| 3 | Laurence Holding | St Andrew's College | 57.97q |
| 4 | Scott Thompson | Combined Country High Sch | 58.57q |
| 5 | Hayden Fussell | Riccarton High School | 1:02.00 |
| -- | Richard Andrews | St Andrew's College | DNS |
| -- | Fraser Henderson | Christ's College | DNS |
| -- | Leroy Smith | Cathedral College | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Tim Manson | Christ's College | 53.29 |
| 2 | Cameron Mitchell | St Andrew's College | 54.28 |
| 3 | Michael Scally | St Bede's College | 54.63 |
| 4 | Loren Burnett | Burnside High School | 55.10 |
| 5 | Hamish Upton | Burnside High School | 55.85 |
| 6 | Scott Thompson | Combined Country High Sch | 56.13 |
| 7 | Simon Morse | Cashmere High School | 56.65 |
| -- | Laurence Holding | St Andrew's College | DNS |