| Mark | Athlete | School | Year | Meet |
|---|
| 44.69 | Lakyn Connors | Corvallis (A) | 12 | Southwestern A Divisional |
| 45.40 | Holly Anderson | Beaverhead Co./Dillon (A) | 10 | State A |
| 46.66 | Shalea Wallen | Frenchtown (A) | 11 | State A |
| 46.73 | Anna DiGiallonardo | Polson (A) | 12 | Northwestern A Divisional |
| 46.78 | Lexi Prevost | Sidney (A) | 11 | State A |
| 46.83 | Megan Hawkins | Park/Livingston (A) | 11 | Central A Divisional |
| 47.7 | Mattison McNally | Bigfork (A) | 9 | State B |
| 47.22 | Phoebe Guercio | Whitefish (A) | 11 | Northwestern A Divisional |
| 47.89 | Joire Chavez | Hardin (A) | 12 | State A |
| 48.50 | Espe Battrick | Fergus/Lewistown (A) | | State A |
| 48.74 | Taylor Jensen | Fergus/Lewistown (A) | 12 | 5/4 Havre Triangular |