| Mark | Athlete | School | Year | Meet |
|---|
| 57.83 | Hazel Bishop | Helena (AA) | 11 | Great Falls Optimist Club Invitational |
| 58.11 | Madilyn Todorovich | Helena (AA) | 12 | Great Falls/Helena Dual |
| 58.15 | Anneliese Bessette | Missoula Hellgate (AA) | 12 | Great Falls Optimist Club Invitational |
| 58.40 | Isabel Ross | Gallatin (Bozeman) (AA) | 12 | Bozeman Crosstown Dual |
| 58.67 | Aliyah Vogel | Billings West (AA) | 11 | Great Falls Optimist Club Invitational |
| 59.15 | Nya Myers | Missoula Big Sky (AA) | 10 | Western AA Divisional |
| 59.31 | Delainey Engen | Billings West (AA) | 12 | Senior/Gallatin/West Triangular |
| 59.86 | Emma Ormsby | Billings Senior (AA) | 10 | Midland Roundtable Top 10 |
| 59.88 | Hazel Cooper | Gallatin (Bozeman) (AA) | 10 | Bozeman Crosstown Dual |
| 1:00.16 | Carmen Eddy | Glacier (AA) | 12 | Glacier/Flathead Dual |
| 1:00.17 | Mia Swartz | Missoula Sentinel (AA) | 10 | Western AA Divisional |
| 1:00.35 | Alex Bonini | Billings West (AA) | 11 | Billings City Meet |
| 1:00.94 | Finley Samuels | Gallatin (Bozeman) (AA) | 10 | CMR/Gallatin Dual |
| 1:00.96 | Demry Boyd | Billings West (AA) | 11 | Senior/Gallatin/West Triangular |
| 1:01.00 | Clara Bishop | Missoula Sentinel (AA) | 10 | MCPS Invitational |
| 1:01.04 | Leah Roberts | Billings Skyview (AA) | 9 | Dan Hansen Invitational (WY) |
| 1:01.21 | Grace Marshal | Missoula Big Sky (AA) | 11 | Missoula "Greg Rice" City Meet |
| 1:01.53 | Dacia Benkelman | Glacier (AA) | 11 | Western AA Divisional |
| 1:01.62 | Elizabeth Urban | Helena Capital (AA) | 10 | Western AA Divisional |
| 1:01.63 | Gwendalyn Clingan | Belgrade (AA) | 12 | Midland Roundtable Top 10 |
| 1:01.79 | Isabella Donaghey | Gallatin (Bozeman) (AA) | 11 | CMR/Gallatin Dual |
| 1:01.85 | Avery Stulc | Billings Senior (AA) | 9 | Yellowstone Bank Freshman Meet |