| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Sienna Stowers-Smith | St Andrew's College | 1:01.98q |
| 2 | Charlotte Mercer | Villa Maria College | 1:02.36q |
| 3 | Samantha Donaldson | John Paul II High School | 1:03.26q |
| 4 | Madeline Thomas | Craighead Diocesan School | 1:07.47 |
| 5 | Emily Osborne | Geraldine High School | 1:08.98 |
| -- | Julia Kersten | Garin College | DNS |
| Placing | Athlete | Team | Preliminaries |
|---|---|---|---|
| 1 | Billie Crowe | St Hilda's Collegiate | 1:01.91q |
| 2 | Sarah Jamison | Waitaki Girls' High School | 1:03.34q |
| 3 | Olivia Herman | Villa Maria College | 1:04.51q |
| 4 | Rosaria Gibson | Villa Maria College | 1:05.28q |
| 5 | Darcie Evans-Tobata | Otago Girls High School | 1:06.32q |
| 6 | Ella Hou | Otago Girls High School | 1:07.00 |
| 7 | Monica McDonald | Roncalli College | 1:07.80 |
| 8 | McKenzie Napier | Gore High School | 1:08.95 |
| Placing | Athlete | Team | Finals |
|---|---|---|---|
| 1 | Sienna Stowers-Smith | St Andrew's College | 59.58 |
| 2 | Billie Crowe | St Hilda's Collegiate | 1:00.80 |
| 3 | Charlotte Mercer | Villa Maria College | 1:01.58 |
| 4 | Samantha Donaldson | John Paul II High School | 1:01.65 |
| 5 | Sarah Jamison | Waitaki Girls' High School | 1:02.25 |
| 6 | Olivia Herman | Villa Maria College | 1:02.77 |
| 7 | Rosaria Gibson | Villa Maria College | 1:04.55 |
| 8 | Darcie Evans-Tobata | Otago Girls High School | 1:06.52 |