| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Joesph Nash | Christ's College | 55.80q |
| 2 | Liam O'Donnel | St Thomas Of Canterbury Colleg | 58.90q |
| 3 | Couper Killick | St Andrew's College | 1:00.17q |
| 4 | Cameron Anderson | Geraldine High School | 1:02.95 |
| -- | Jack Bethell | Christ's College | DNS |
| -- | James Hansen | Marlborough Boys College | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Nicolas Alvarez Rey-Virag | Logan Park High School | 54.88q |
| 2 | Nikau McMurray | Motueka High School | 55.76q |
| 3 | Connor Troon | Shirley Boys High School | 56.09q |
| 4 | Millar McElrea | Tokomairiro High School | 58.38q |
| 5 | Ethan Bone | Burnside High School | 1:00.31q |
| 6 | Reuben Dempster | Marlborough Boys College | 1:02.54 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Nikau McMurray | Motueka High School | 53.38 |
| 2 | Nicolas Alvarez Rey-Virag | Logan Park High School | 54.76 |
| 3 | Connor Troon | Shirley Boys High School | 55.15 |
| 4 | Joesph Nash | Christ's College | 55.84 |
| 5 | Millar McElrea | Tokomairiro High School | 57.19 |
| 6 | Couper Killick | St Andrew's College | 58.38 |
| 7 | Liam O'Donnel | St Thomas Of Canterbury Colleg | 59.37 |
| 8 | Ethan Bone | Burnside High School | 1:00.10 |