| Lane | # | Athlete | Team | Seed | Note |
|---|---|---|---|---|---|
| 1 | 32 | JOHNSON, David | Unattached British Columbia | 51.31 | Class 12 |
| 2 | 40 | LOWTHER, Porter | Prairie Inn Harriers Racing Team | 53.60 | |
| 3 | 6 | BIEBER, Duncan | Prairie Inn Harriers Racing Team | 52.60 | |
| 4 | 16 | CRAM, William | Nanaimo & District Track & Field Club | 49.79 | |
| 5 | 25 | HAAGENSEN, Chase | Unattached British Columbia | 48.28 | |
| 6 | 56 | PRIMEAU, Luc | Vancouver Thunderbirds | 49.50 | |
| 7 | 74 | VENABLES, Levi | Victoria Speed Project | 50.17 | |
| 8 | 31 | HURTUBISE, Hayden | Vancouver Thunderbirds | 51.48 | |
| 9 | 43 | MALCOLM, Zachary | Victoria Speed Project | 53.49 |