| Mark | Athlete | School | Year | Meet |
|---|
| 43.79 | Morgan Evans | Great Falls (AA) | 11 | State AA |
| 44.48 | Hannah Coburn | Missoula Big Sky (AA) | 12 | State AA |
| 45.31 | Audri Demars | Billings West (AA) | 11 | State AA |
| 45.66 | Julia Zidack | Bozeman (AA) | 12 | State AA |
| 45.81 | Brittney Marosok | Billings West (AA) | 12 | Eastern AA Divisionals |
| 45.91 | Michaela Johnson | Billings West (AA) | 12 | MidLand Round Table Top Ten |
| 46.06 | Pipi Eitel | Belgrade (AA) | 11 | State A |
| 46.18 | Syd Steele | Missoula Sentinel (AA) | 11 | State AA |
| 46.40 | Kailee Stoppel | Billings West (AA) | 10 | Eastern AA Divisionals |
| 46.61 | Shelby Philipps | Great Falls CMR (AA) | 11 | State AA |
| 46.67 | Ahna Kreitinger | Glacier (AA) | 11 | Glacier v. Great Falls Dual |
| 46.77 | Tavy Findon | Billings Senior (AA) | 9 | State AA |
| 47.25 | Maysee Whitney | Billings Senior (AA) | 10 | State AA |
| 47.85 | Josie D'Agostino | Bozeman (AA) | 12 | MidLand Round Table Top Ten |
| 47.94 | Elsa Sveen | Bozeman (AA) | 11 | Butte Invite |
| 48.33 | Ashley McElmurry | Missoula Sentinel (AA) | 9 | Greg Rice Missoula City Meet |
| 48.36 | Abigail Harmon | Helena Capital (AA) | | State AA |
| 48.40 | Teresa Patten | Helena Capital (AA) | 12 | State AA |
| 48.57 | Joselyn Ketchum | Billings Senior (AA) | 9 | Yellowstone Bank Freshman Invitational |
| 48.85 | Katie Ellig | Bozeman (AA) | 10 | Eastern AA Divisionals |