| Mark | Athlete | School | Year | Meet |
|---|
| 57.82 | Madilyn Todorovich | Helena (AA) | 11 | State AA Championship |
| 59.08 | Hazel Bishop | Helena (AA) | 10 | Helena Crosstown Meet |
| 59.09 | Isabel Ross | Gallatin (Bozeman) (AA) | 11 | Eastern AA Divisional |
| 59.41 | Sophia Miller | Missoula Hellgate (AA) | 12 | State AA Championship |
| 59.52 | Anneliese Bessette | Missoula Hellgate (AA) | 11 | Big Sky Triangular 4/9 |
| 59.57 | Aliyah Vogel | Billings West (AA) | 10 | State AA Championship |
| 59.94 | Kaitlyn Skinner | Missoula Hellgate (AA) | 12 | Western AA Divisional |
| 1:00.10 | Grace Stewart | Belgrade (AA) | 12 | State AA Championship |
| 1:00.23 | Isis Haslem | Great Falls (AA) | 12 | Great Falls Optimist Meet |
| 1:00.32 | Zoey Bortz | Flathead (AA) | 11 | State AA Championship |
| 1:00.37 | Phoenix Hyland | Missoula Hellgate (AA) | 9 | Greg Rice City Meet |
| 1:00.49 | Mia Swartz | Missoula Sentinel (AA) | 9 | Western AA Divisional |
| 1:00.54 | Reghan Skogen | Helena (AA) | 12 | Western AA Divisional |
| 1:00.58 | Breanna Smith | Missoula Sentinel (AA) | 10 | Sentinel Triangular 3/26 |
| 1:00.71 | Alex Bonini | Billings West (AA) | 10 | Eastern AA Divisional |
| 1:00.85 | Kourtney Grossman | Billings West (AA) | 12 | Midland Roundtable Top 10 |
| 1:00.87 | Shaylee Soule | Helena Capital (AA) | 11 | Western AA Divisional |
| 1:00.93 | Grace Curnow | Billings West (AA) | 11 | Bozeman Quad |
| 1:00.99 | Dacia Benkelman | Glacier (AA) | 10 | State AA Championship |
| 1:01.02 | Carmen Eddy | Glacier (AA) | 11 | Russ Plicher Western Top 10 |
| 1:01.18 | Grace Gall | Flathead (AA) | 9 | Last Chance Quad |
| 1:01.18 | Gwendalyn Clingan | Belgrade (AA) | 11 | State AA Championship |
| 1:01.21 | Isabella Donaghey | Gallatin (Bozeman) (AA) | 10 | Eastern AA Divisional |
| 1:01.44 | Leela Ormsby | Billings Senior (AA) | 11 | State AA Championship |
| 1:01.46 | Kadynce Sperry | Missoula Big Sky (AA) | 12 | Western AA Divisional |