| Mark | Athlete | School | Year | Meet |
|---|
| 56.51 | Christina Aragon | Billings Senior (AA) | 10 | Billings Senior Quad 4/29 |
| 56.65 | Carly Smiedala | Helena (AA) | 10 | Skor-DeKam Invitational |
| 58.73 | Josey Smiedala | Helena (AA) | 11 | State AA |
| 58.98 | Erika McLeod | Butte (AA) | 12 | Great Falls Optimist Meet |
| 59.20 | Olivia Romei | Billings Senior (AA) | 9 | Eastern AA Divisional |
| 59.62 | Tanna Holliday | Belgrade (AA) | 12 | State A |
| 59.86 | Anna Beck | Billings Skyview (AA) | 10 | Eastern AA Divisional |
| 59.96 | Meskerem Bradford | Bozeman (AA) | 12 | State AA |
| 1:00.00 | Morgan Sulser | Billings Senior (AA) | 12 | Billings Senior Quad 4/29 |
| 1:00.20 | Syd Steele | Missoula Sentinel (AA) | 9 | Western AA Divisional |
| 1:00.67 | Jess Raty | Billings Senior (AA) | 10 | Eastern AA Divisional |
| 1:00.74 | Olivia Burgad | Missoula Sentinel (AA) | 10 | State AA |
| 1:00.85 | Madeline Orrell | Belgrade (AA) | 11 | John Tomich Invitational |
| 1:01.08 | Haley Gellner | Billings Skyview (AA) | 12 | Billings City Meet |
| 1:01.11 | Ahna Kreitenger | Billings Senior (AA) | | Western AA Divisional |
| 1:01.23 | Mia Werner | Bozeman (AA) | 9 | Eastern AA Divisional |
| 1:01.40 | Trisha Carlson | Great Falls CMR (AA) | 9 | Great Falls Freshman Meet |
| 1:01.89 | Brielle Bumgarner | Glacier (AA) | 11 | Western AA Divisional |
| 1:01.90 | Bailee Hanson | Butte (AA) | 12 | John Tomich Invitational |
| 1:01.98 | Keegan Day | Billings Skyview (AA) | 11 | Gary Benson Border Wars (WY) |