| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ryan Williams | Ashburton College | 1:00.60q |
| 2 | Mark Benny | Mountainview High School | 1:02.20q |
| 3 | Daniel Sharp | Waitaki Boys' High School | 1:08.10q |
| -- | Darryl Tooley | Roncalli College | NT |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Ethan Clarke | Waitaki Boys' High School | 1:00.60q |
| 2 | Robert Mensen | Geraldine High School | 1:02.00q |
| 3 | Ethan Ligett | Timaru Boys' High School | 1:03.60q |
| 4 | Angus Norrie | Mt Hutt College | 1:05.50q |
| 5 | Mitchell Wills | Mackenzie College | 1:06.70q |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Ryan Williams | Ashburton College | 1:01.04 |
| 2 | Robert Mensen | Geraldine High School | 1:01.08 |
| 3 | Mark Benny | Mountainview High School | 1:02.08 |
| -- | Ethan Clarke | Waitaki Boys' High School | NT |
| -- | Ethan Ligett | Timaru Boys' High School | NT |
| -- | Angus Norrie | Mt Hutt College | NT |
| -- | Daniel Sharp | Waitaki Boys' High School | NT |
| -- | Mitchell Wills | Mackenzie College | NT |