| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Michael Sellwood | Darfield High School | 59.99q |
| 2 | Thomas Barclay | Christ's College | 1:01.11 |
| 3 | Geoffrey Scott | Shirley Boys High School | 1:02.02 |
| 4 | paul Petersen | Papanui High School | 1:06.19 |
| -- | Malcolm Creelman | Christchurch Boys High Sc | DNS |
| -- | Shaun Glasson | Burnside High School | DNS |
| -- | Graeme Sullivan | St Thomas of Canterbury C | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Albert Adcock | Christchurch Boys High Sc | 58.55q |
| 2 | Rhett Moore | Papanui High School | 1:00.03q |
| 3 | Sam Bell | St Thomas of Canterbury C | 1:00.33q |
| 4 | Uddaka Wijesinghe | Christ's College | 1:00.95q |
| -- | James Howland | Unlimited Paenga Tawhiti | DNS |
| -- | Anton Tarasenko | Burnside High School | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ben Evans | St Bede's College | 57.53q |
| 2 | Jack Morrison | Christchurch Boys High Sc | 58.35q |
| 3 | Slade MCGill | Combined Country High Sch | 1:00.38q |
| 4 | Aaron Scott | Burnside High School | 1:02.94 |
| 5 | Callan Tucker | Shirley Boys High School | 1:03.50 |
| -- | Sam Wood | Lincoln High School | DNS |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Ben Evans | St Bede's College | 56.09 |
| 2 | Jack Morrison | Christchurch Boys High Sc | 56.30 |
| 3 | Albert Adcock | Christchurch Boys High Sc | 57.32 |
| 4 | Michael Sellwood | Darfield High School | 57.41 |
| 5 | Sam Bell | St Thomas of Canterbury C | 58.14 |
| 6 | Rhett Moore | Papanui High School | 58.48 |
| 7 | Uddaka Wijesinghe | Christ's College | 59.03 |
| -- | Slade MCGill | Combined Country High Sch | DNS |