| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Kyan Trebes | Christchurch Boys High School | 55.21q |
| 2 | Atlas Loutfi | St Pauls Collegiate (Hamilton) | 55.98q |
| 3 | Lachlan Stefanidis | Wellington College | 57.13q |
| 4 | Ethan Bone | Burnside High School | 57.57 |
| 5 | Robert McIvor | Otago Boys High School | 57.85 |
| 6 | Lindsay Johnstone | Whanganui Collegiate | 58.74 |
| 7 | Tobey Lim | St Patrick's College (Silverst | 1:01.40 |
| 8 | Sam Lohrey | Palmerston North Boys High Sch | 1:01.61 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Eamon Buick | Mt Albert Grammar | 54.92q |
| 2 | Nicolas Alvarez Rey-Virag | Logan Park High School | 55.30q |
| 3 | Finn O'Sullivan | Christchurch Boys High School | 55.64q |
| 4 | Aryan Rai | Burnside High School | 55.98q |
| 5 | Axel McKenna | Tawa College | 56.10q |
| 6 | Thomas Leske | Rathkeale College/Trinity Seni | 57.66 |
| 7 | Trent Scotson | St Patrick's College (Silverst | 59.76 |
| -- | Cory Lovell | Hutt International Boys' Schoo | DQ |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Lex Revell-Lewis | Avondale College | 54.39q |
| 2 | Charles Roil | Lindisfarne College | 55.01q |
| 3 | Symon Maguire | Otago Boys High School | 55.18q |
| 4 | Greg Austin | Palmerston North Boys High Sch | 55.91q |
| 5 | Corvin O'Rourke | James Hargest High School | 57.00 |
| 6 | Sidney Fimone | Cook Islands | 1:01.90 |
| 7 | Levi Hoekstra | Whanganui High School | 1:03.33 |
| -- | Rayhaan Idris | St Patrick's College (Silverst | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Liam Hill | Burnside High School | 55.98q |
| 2 | Liam Willcocks | St Patrick's College (Silverst | 56.03q |
| 3 | Nat Kirk | Whanganui High School | 56.25q |
| 4 | Jack Turner | Kristin School | 56.46q |
| 5 | Forbes Kennedy | Palmerston North Boys High Sch | 56.75 |
| 6 | Ashden Brew | Hutt Valley High School | 57.97 |
| 7 | Ben Goden | Wairarapa College | 59.45 |
| 8 | Jack Sadler | Campion College | 59.62 |
| Placing | Athlete | Team | Semi Finals |
|---|---|---|---|
| 1 | Lex Revell-Lewis | Avondale College | 54.52q |
| 2 | Charles Roil | Lindisfarne College | 54.71q |
| 3 | Symon Maguire | Otago Boys High School | 55.37q |
| 4 | Liam Hill | Burnside High School | 56.17 |
| 5 | Greg Austin | Palmerston North Boys High Sch | 56.57 |
| 6 | Lachlan Stefanidis | Wellington College | 57.14 |
| 7 | Liam Willcocks | St Patrick's College (Silverst | 58.30 |
| 8 | Jack Turner | Kristin School | 58.63 |
| Placing | Athlete | Team | Semi Finals |
|---|---|---|---|
| 1 | Kyan Trebes | Christchurch Boys High School | 54.19q |
| 2 | Nat Kirk | Whanganui High School | 54.30q |
| 3 | Eamon Buick | Mt Albert Grammar | 54.49q |
| 4 | Atlas Loutfi | St Pauls Collegiate (Hamilton) | 54.76q |
| 5 | Nicolas Alvarez Rey-Virag | Logan Park High School | 55.04q |
| 6 | Finn O'Sullivan | Christchurch Boys High School | 55.05 |
| 7 | Aryan Rai | Burnside High School | 55.99 |
| -- | Axel McKenna | Tawa College | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Lex Revell-Lewis | Avondale College | 51.57 |
| 2 | Charles Roil | Lindisfarne College | 52.30 |
| 3 | Symon Maguire | Otago Boys High School | 53.80 |
| 4 | Eamon Buick | Mt Albert Grammar | 54.00 |
| 5 | Kyan Trebes | Christchurch Boys High School | 54.05 |
| 6 | Nicolas Alvarez Rey-Virag | Logan Park High School | 54.17 |
| 7 | Atlas Loutfi | St Pauls Collegiate (Hamilton) | 54.54 |
| 8 | Nat Kirk | Whanganui High School | 55.79 |