| Mark | Athlete | School | Year | Meet |
|---|
| 56.40 | Carly Smiedala | Helena (AA) | 9 | Western AA Divisional |
| 56.93 | Liz Harper | Missoula Sentinel (AA) | 12 | State AA |
| 58.26 | Erica McLeod | Butte (AA) | 11 | Eastern AA Divisional |
| 58.80 | Marisa Sanchez | Helena Capital (AA) | 12 | Western AA Divisional |
| 59.07 | Lila Hamburg | Billings West (AA) | 12 | Billings City Meet |
| 59.33 | Cate Hanna | Billings West (AA) | 12 | 5/4 Skyview Triangular |
| 59.49 | Josey Smiedala | Helena (AA) | 10 | Great Falls Optimist Invitational |
| 59.70 | Anna Deleray | Glacier (AA) | 12 | Western AA Divisional |
| 59.70 | Jaclyn Rauthe | Flathead (AA) | 12 | Western AA Divisional |
| 1:00.20 | Ellen Ruby | Missoula Hellgate (AA) | 12 | Western AA Divisional |
| 1:00.34 | Alyssa Espinoza | Billings West (AA) | 12 | State AA |
| 1:00.61 | Haley Gellner | Billings Skyview (AA) | 11 | 5/4 Skyview Triangular |
| 1:00.72 | Tanna Holliday | Belgrade (AA) | 11 | State A |
| 1:00.87 | Madi Rembe | Great Falls CMR (AA) | 12 | State AA |
| 1:01.11 | Madeline Orrell | Belgrade (AA) | | State A |
| 1:01.15 | Keegan Day | Billings Skyview (AA) | 10 | 4/23 Billings Senior Meet |
| 1:01.20 | Anna Deleray | Glacier (AA) | 12 | Whitefish A.R.M. Invitational |
| 1:01.28 | Shealynn Wacaser | Billings Skyview (AA) | 11 | Great Falls Optimist Invitational |
| 1:01.83 | Jess Raty | Billings Senior (AA) | | Eastern AA Divisional |