| Mark | Athlete | School | Year | Meet |
|---|
| 12.19 | Quinlyn Simmons | Helena (AA) | 9 | Helena/Big Sky/Hellgate Tri |
| 12.31 | Emery Peel | Billings Senior (AA) | 11 | Billings City Meet |
| 12.35 | Isabella Donaghey | Gallatin (Bozeman) (AA) | 11 | Billings Invite |
| 12.36 | Sofia Szollosi | Missoula Hellgate (AA) | 12 | Helena/Big Sky/Hellgate Tri |
| 12.38 | Alayna Hurd | Billings West (AA) | 12 | Billings City Meet |
| 12.47 | Delainey Engen | Billings West (AA) | 12 | Senior/Gallatin/West Triangular |
| 12.47 | Demry Boyd | Billings West (AA) | 11 | Billings City Meet |
| 12.56 | Scotland Jones | Bozeman (AA) | 11 | Eastern AA Divisional |
| 12.58 | Hazel Bishop | Helena (AA) | 11 | Helena/Big Sky/Hellgate Tri |
| 12.60 | Mayiehl Shaw | Belgrade (AA) | 12 | Belgrade Open |
| 12.61 | Nora Allen | Billings West (AA) | 10 | Senior/Gallatin/West Triangular |
| 12.61 | Audrey Thelen | Belgrade (AA) | 11 | Belgrade Open |
| 12.65 | Alivia Rinehart | Flathead (AA) | 12 | Kalispell Time Trials |
| 12.68 | Anneliese Bessette | Missoula Hellgate (AA) | 12 | Western AA Divisional |
| 12.71 | Isabella Grutsch | Missoula Big Sky (AA) | 12 | Western AA Divisional |
| 12.75 | Myley Bronaugh | Billings Skyview (AA) | 11 | Billings City Meet |
| 12.79 | Hosnya Ayidomihou | Helena Capital (AA) | 11 | Helena Crosstown Meet |
| 12.82 | Carleigh Mahn | Billings West (AA) | 9 | Yellowstone Bank Freshman Meet |
| 12.83 | Scarlet Harris | Great Falls (AA) | 10 | Great Falls/Skyview Dual |
| 12.91 | Zeila Wagner | Glacier (AA) | 11 | Western AA Divisional |
| 12.99 | Addie Falls Down | Billings Senior (AA) | 12 | Dan Hansen Invitational (WY) |
| 12.99 | Harper Dirk | Great Falls (AA) | 10 | Great Falls/Bozeman Dual |
| 13.04 | Jacquie Etchart | Billings Senior (AA) | 11 | Billings City Meet |
| 13.06 | Ella Claunch | Billings West (AA) | 10 | Senior/Gallatin/West Triangular |
| 13.06 | Dylann Bartoletti | Butte (AA) | 12 | Western AA Divisional |
| 13.06 | Taleah Wilson | Belgrade (AA) | 12 | Belgrade Open |
| 13.06 | Bryn Fitzgerald | Billings West (AA) | 9 | Billings City Meet |
| 13.11 | Mia Carrell | Helena (AA) | 12 | Helena Crosstown Meet |
| 13.15 | Claire Townsend | Billings West (AA) | 10 | Senior/Gallatin/West Triangular |