| Mark | Athlete | School | Year | Meet |
|---|
| 43.37 | Taylee Chirrick | Roberts (C) | 12 | Southern C Divisional |
| 44.76 | Josie Brown | Saco (C) | 12 | Eastern C Divisional |
| 44.82 | Ayla Janzen | Twin Bridges (C) | 12 | State C Championship |
| 46.33 | Emma Konen | Twin Bridges (C) | 12 | Russ Plicher Western Top 10 |
| 46.75 | Claire Bucklin | Sunburst (C) | 12 | Havre Lions' Invitational |
| 47.22 | Mady Willis | Scobey (C) | 11 | State C Championship |
| 47.44 | Bella Triemstra | Manhattan Christian (C) | 11 | State C Championship |
| 47.53 | Jolee Klempel | Richey-Lambert (C) | 9 | Eastern C Divisional |
| 47.77 | Bridget Reed | Turner (C) | 10 | State C Championship |
| 47.92 | Ava White | Superior (C) | 9 | KLH Memorial Invitational |
| 48.24 | Krystan Hafla | Garfield Co./Jordan (C) | 12 | Norm Girard North/East Top 10 |
| 48.38 | Ali Doyle | Turner (C) | 9 | State C Championship |
| 48.62 | Allie Dale | Twin Bridges (C) | 12 | State C Championship |
| 48.70 | Elsie Wilson | Bainville (C) | 11 | Eastern C Divisional |