| Mark | Athlete | School | Year | Meet |
|---|
| 58.28 | Madilyn Todorovich | Helena (AA) | 10 | Western AA Divisional |
| 58.57 | Hazel Bishop | Helena (AA) | 9 | State AA Championship |
| 58.76 | Olivia Collins | Gallatin (Bozeman) (AA) | 12 | Skor DeKam Invite |
| 58.94 | Isabel Ross | Gallatin (Bozeman) (AA) | 10 | Eastern AA Divisional |
| 59.11 | Hailey Burger | Helena Capital (AA) | 11 | State AA Championship |
| 59.61 | Breanna Smith | Missoula Sentinel (AA) | 9 | Sentinel Invitational |
| 59.68 | Alexis Brauer | Billings Skyview (AA) | 12 | Billings Public City Meet |
| 59.92 | Brynn Brower | Billings Skyview (AA) | 10 | State AA Championship |
| 59.97 | Ashlyn Graham | Gallatin (Bozeman) (AA) | 12 | Bozeman Triangular |
| 1:00.13 | Hope Madill | Great Falls CMR (AA) | 11 | State AA Championship |
| 1:00.23 | Peyton Walker | Flathead (AA) | 12 | Last Chance Triangular |
| 1:00.51 | Ruby Lorenz | Missoula Sentinel (AA) | 12 | Western AA Divisional |
| 1:00.62 | Payton Grover | Billings Senior (AA) | 11 | Billings Public City Meet |
| 1:00.70 | Kourtney Grossman | Billings West (AA) | 11 | State AA Championship |
| 1:00.79 | Leela Ormsby | Billings Senior (AA) | 10 | Butte-Senior Dual |
| 1:00.81 | Emma Kirkhart | Great Falls (AA) | 12 | Great Falls Crosstown Dual |
| 1:00.96 | Sophia Miller | Missoula Hellgate (AA) | 11 | Archie Roe Invitational |
| 1:01.00 | Ela Bloyder | Billings West (AA) | 12 | Eastern AA Divisional |
| 1:01.07 | Halle Haber | Billings West (AA) | 11 | West-Skyview Dual |
| 1:01.15 | Kadynce Sperry | Missoula Big Sky (AA) | 11 | Big Sky-Butte Dual |
| 1:01.25 | Aliyah Vogel | Billings West (AA) | 9 | West-Skyview Dual |
| 1:01.30 | Bailey Wride | Flathead (AA) | 12 | Western AA Divisional |
| 1:01.36 | Shaylee Soule | Helena Capital (AA) | 10 | Helena Crosstown Meet |
| 1:01.43 | Isis Haslem | Great Falls (AA) | 11 | Great Falls Crosstown Dual |
| 1:01.46 | Mikenna Conan | Flathead (AA) | 11 | Western AA Divisional |
| 1:01.54 | Brooklyn Ludemann | Missoula Big Sky (AA) | 11 | Big Sky-Butte Dual |
| 1:01.59 | Claire Rutherford | Gallatin (Bozeman) (AA) | 10 | Bozeman Crosstown Dual |
| 1:01.71 | Kaitlyn Skinner | Missoula Hellgate (AA) | 11 | MCPS Invite |
| 1:01.72 | Layla Baumann | Billings West (AA) | 12 | Billings Central Invite |
| 1:01.80 | Kennady Garvin | Glacier (AA) | 10 | Western AA Divisional |