| Mark | Athlete | School | Year | Meet |
|---|
| 42.87 | Liz Harper | Missoula Sentinel (AA) | 12 | State AA |
| 43.20 | Morgan Sulser | Billings Senior (AA) | 11 | State AA |
| 45.18 | Alyssa Espinoza | Billings West (AA) | 12 | Eastern AA Divisional |
| 45.43 | Hailey Copinga | Billings Skyview (AA) | 10 | State AA |
| 45.46 | Hannah Coburn | Missoula Big Sky (AA) | 9 | State AA |
| 46.65 | Rhiannon Sturgess | Flathead (AA) | 11 | Archie Roe Invitational |
| 46.77 | Haley Gellner | Billings Skyview (AA) | 11 | 4/23 Billings Senior Meet |
| 47.04 | Kwyn Johnson | Flathead (AA) | 12 | Great Falls Optimist Invitational |
| 47.39 | Courtney Carl | Missoula Big Sky (AA) | 10 | 4/26 Big Sky Quad |
| 47.88 | Alyssa Jonasen | Great Falls (AA) | 10 | State AA |
| 47.96 | Hailee Bennett | Glacier (AA) | | State AA |
| 48.08 | Caitlyn Farmer | Missoula Hellgate (AA) | 10 | Greg Rice City Meet |
| 48.39 | Julia Zidack | Bozeman (AA) | 9 | Midland Roundtable Top 10 Meet |
| 48.45 | Kirsten Kaste | Great Falls CMR (AA) | | State AA |
| 48.64 | Courtney Stromme | Belgrade (AA) | 11 | Park Invitational |
| 48.74 | Brittney Marosok | Billings West (AA) | | State AA |