| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Jamie Robb | Waitaki Boys' High School | 52.92q |
| 2 | Ethan Campbell | James Hargest High School | 53.47q |
| 3 | Samuel Gilchrist | Christ's College | 53.53q |
| 4 | Morgan Thomson | Timaru Boys' High School | 53.88q |
| 5 | Thomas Gordon | Lincoln High School | 54.25 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Thomas Martin | St Bede's College | 52.11q |
| 2 | Michael Peterson | James Hargest High School | 52.43q |
| 3 | Rodney Bungard | St Kevin's College | 52.74q |
| 4 | Sam Johnstone | Ashburton College | 53.05q |
| 5 | Nicholas Hutchinson | Christ's College | 53.91 |
| -- | Sean Clemenston | Waimea College | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Thomas Martin | St Bede's College | 50.48 |
| 2 | Michael Peterson | James Hargest High School | 51.64 |
| 3 | Samuel Gilchrist | Christ's College | 52.10 |
| 4 | Jamie Robb | Waitaki Boys' High School | 52.39 |
| 5 | Ethan Campbell | James Hargest High School | 52.72 |
| 6 | Rodney Bungard | St Kevin's College | 53.00 |
| 7 | Sam Johnstone | Ashburton College | 53.77 |
| 8 | Morgan Thomson | Timaru Boys' High School | 54.42 |