| Mark | Athlete | School | Year | Meet |
|---|
| 56.02 | Odessa Zentz | Helena (AA) | 12 | State AA |
| 57.04 | Taylee Chirrick | Billings West (AA) | 10 | State AA |
| 58.09 | Madilyn Todorovich | Helena (AA) | 9 | Western AA Divisional |
| 59.58 | Hailey Burger | Helena Capital (AA) | 10 | State AA |
| 59.84 | Alexis Brauer | Billings Skyview (AA) | 11 | Eastern AA Divisional |
| 59.88 | Halle Haber | Billings West (AA) | 10 | State AA |
| 59.95 | Ela Bloyder | Billings West (AA) | 11 | State AA |
| 1:00.01 | Emilie Crago | Great Falls CMR (AA) | 12 | Great Falls Crosstown Dual |
| 1:00.03 | Sidney Gulick | Glacier (AA) | 12 | State AA |
| 1:00.24 | Ave Roberts | Billings Skyview (AA) | 11 | State AA |
| 1:00.35 | Olivia Collins | Gallatin (Bozeman) (AA) | 11 | Butte-Bozeman-Gallatin Tri |
| 1:00.37 | Peyton Walker | Flathead (AA) | 11 | Flathead-Hellgate-Sentinel Tri |
| 1:00.44 | Ela Bloyder | Billings West (AA) | 11 | Eastern AA Divisional |
| 1:00.76 | Hayley Burns | Bozeman (AA) | 12 | Skor DeKam Invite |
| 1:00.86 | Ruby Lorenz | Missoula Sentinel (AA) | 11 | Western AA Divisional |
| 1:01.05 | Leela Ormsby | Billings Senior (AA) | 9 | Eastern AA Divisional |
| 1:01.10 | Sydney Morris | Billings Skyview (AA) | 11 | Eastern AA Divisional |
| 1:01.15 | Sophia Miller | Missoula Hellgate (AA) | 10 | Flathead-Hellgate-Sentinel Tri |
| 1:01.37 | Beatrice Bentler | Billings Skyview (AA) | 10 | Eastern AA Divisional |
| 1:01.39 | Mykayla Miller | Missoula Sentinel (AA) | 10 | Greg Rice City Meet |
| 1:01.69 | Grace Stewart | Belgrade (AA) | 10 | Eastern AA Divisional |
| 1:01.71 | Ashlyn Graham | Gallatin (Bozeman) (AA) | | Eastern AA Divisional |
| 1:01.72 | Brynn Brower | Billings Skyview (AA) | 9 | Midland Roundtable Top 10 |
| 1:01.75 | Akilah Kubi | Flathead (AA) | 11 | Western AA Divisional |
| 1:01.89 | Hadley Brown | Bozeman (AA) | 9 | Yellowstone Bank Freshman Invite |