| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Galwey Nick | Mackenzie College | 58.00q |
| 2 | Robert Mensen | Geraldine High School | 58.20q |
| 3 | Peter Knight | Waitaki Boys' High School | 1:04.20q |
| 4 | Nathan Ruthe | Opihi College | 1:07.30q |
| -- | Darryl Tooley | Roncalli College | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ethan Liggett | Timaru Boys' High School | 1:00.80q |
| 2 | Levi Hart | Geraldine High School | 1:02.60q |
| 3 | Jamie Askin | Mountainview High School | 1:04.20q |
| -- | Jeffery Breading | Mt Hutt College | DNS |
| -- | Panupong Ishikawa | Waitaki Boys' High School | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Robert Mensen | Geraldine High School | 57.50 |
| 2 | Galwey Nick | Mackenzie College | 59.00 |
| 3 | Levi Hart | Geraldine High School | 1:00.60 |
| 4 | Ethan Liggett | Timaru Boys' High School | 1:02.50 |
| 5 | Peter Knight | Waitaki Boys' High School | 1:03.70 |
| -- | Jamie Askin | Mountainview High School | NT |
| -- | Nathan Ruthe | Opihi College | NT |