| Lane | # | Athlete | Age | Team | Seed | Note |
|---|---|---|---|---|---|---|
| 1 | 288 | Pandher, Riyah | 16 | Unattached British Columbia | NT | |
| 2 | 184 | McGrath, Aoife | 15 | Ocean Athletics Track & Field Club | NT | |
| 3 | 104 | Wesner, Maile | 15 | Comox Valley Cougars | 45.74 | |
| 4 | 150 | Aulakh-Kahlon, Tanaz | 14 | Ocean Athletics Track & Field Club | 44.68 | |
| 5 | 135 | Schoenroth, Alexis | 16 | Langley Mustangs | 44.91 | |
| 6 | 153 | Bateman, Kennedy | 15 | Ocean Athletics Track & Field Club | 48.63 | |
| 7 | 157 | Bradley, Claire | 13 | Ocean Athletics Track & Field Club | NT |