| Place | Bib | Athlete | School | Result | |
|---|---|---|---|---|---|
| 1 | 405 | Joseph Mee | WAIK | 53.23 | |
| 2 | 361 | Charlie Hildyard | SACR | 53.74 | |
| 3 | 439 | Archie Richardson | PEMB | 54.28 | |
| 4 | 453 | Nicholas Schroder | TATA | 55.51 | |
| 5 | 502 | Max Cormack | MURR | 55.87 | |
| 6 | 318 | Hayden Crowe | MT. | 57.26 | |
| 7 | 482 | Lewis Warren | NORW | 58.54 | |
| 8 | 301 | Oliver Burge | HENL | 1:00.45 | |
| 324 | Blake Del Medico | TRIN | DNS |