| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Rianco Haggard | Howick College | 41.56q |
| 2 | Joshua Dos Santos | Middleton Grange School | 43.26q |
| 3 | Lloyd Crerar | St Peter's School | 44.32q |
| 4 | Dylan Jackson | Christ's College | 45.37 |
| 5 | James McGregor | Whanganui High School | 45.47 |
| 6 | Oran Sim YC | Nelson College | 46.22 |
| 7 | Marlin Brown YC | Nelson College | 47.84 |
| 8 | Toby Lane | St Peter's School | 1:17.35 |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Asher Robertson YC | Hutt International Boys' Schoo | 41.04q |
| 2 | Connor Brady | Takapuna Grammar School | 41.57q |
| 3 | Jakob Voorkamp | Southland Boys High School | 42.78q |
| 4 | Conner Woodcock | Rolleston College | 44.24q |
| 5 | Charlie Forde | Central Southland College | 44.75q |
| 6 | Conor Rook | St Patrick's College (Kilbirni | 45.49 |
| 7 | Spencer Brinsdon | Auckland Grammar School | 54.86 |
| -- | Tito Hay | St Peter's School | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Rianco Haggard | Howick College | 40.64 |
| 2 | Asher Robertson YC | Hutt International Boys' Schoo | 41.35 |
| 3 | Jakob Voorkamp | Southland Boys High School | 42.06 |
| 4 | Connor Brady | Takapuna Grammar School | 42.80 |
| 5 | Joshua Dos Santos | Middleton Grange School | 42.93 |
| 6 | Lloyd Crerar | St Peter's School | 44.02 |
| 7 | Conner Woodcock | Rolleston College | 44.08 |
| 8 | Charlie Forde | Central Southland College | 44.33 |