| Mark | Athlete | School | Year | Meet |
|---|
| 44.07 | Madilyn Todorovich | Helena (AA) | 12 | Skor Dekam Invite |
| 44.54 | Alivia Rinehart | Flathead (AA) | 12 | Western AA Divisional |
| 45.16 | Reagan Johnstone | Stevensville (A) | 9 | Western A Divisional |
| 45.31 | Ali Doyle | Turner (C) | 10 | Northern C Divisional |
| 45.36 | Delainey Engen | Billings West (AA) | 12 | Midland Roundtable Top 10 |
| 45.58 | Scarlet Harris | Great Falls (AA) | 10 | Great Falls Optimist Club Invitational |
| 46.06 | Nya Myers | Missoula Big Sky (AA) | 10 | Western AA Divisional |
| 46.07 | Sophia Berry | Loyola Sacred Heart (B) | 10 | 6B/13C District Meet |
| 46.23 | Ginger Bergland | Whitefish (A) | 9 | MCPS Invitational |
| 46.41 | Carmen Eddy | Glacier (AA) | 12 | Great Falls Optimist Club Invitational |
| 46.45 | Hazel Bishop | Helena (AA) | 11 | Great Falls/Helena Dual |
| 46.52 | Jenna Ellis | Hamilton (A) | 11 | Western A Divisional |
| 46.57 | Caidance Merecki | Huntley Project (B) | 11 | Al Walker Memorial Meet |
| 46.68 | Riley McCoy | Beaverhead Co./Dillon (A) | 12 | Nelson-Thomas ABC Meet |
| 46.69 | Ava White | Superior (B) | 9 | Russ Plicher Western Top 10 |
| 46.71 | Addison Brisendine | Glacier (AA) | 9 | Western AA Divisional |
| 46.76 | Kate Nasner | Circle (C) | 8 | Eastern C Divisional |
| 46.78 | Allison Gama | Loyola Sacred Heart (B) | 10 | Russ Plicher Western Top 10 |
| 46.87 | TJ Chirrick | Roberts (C) | 12 | Al Walker Memorial Meet |
| 47.12 | Bridget Reed | Turner (C) | 11 | 9C District Meet |
| 47.15 | Blythe Armstrong | Fergus/Lewistown (A) | 11 | Midland Roundtable Top 10 |
| 47.27 | Avery Stulc | Billings Senior (AA) | 9 | Eastern AA Divisional |
| 47.36 | Mady Willis | Scobey (C) | 12 | Eastern C Divisional |
| 47.37 | Scarlett Jones | Frenchtown (A) | 10 | Nelson-Thomas ABC Meet |
| 47.43 | Aubrey Korst | Hamilton (A) | 11 | Western A Divisional |
| 47.49 | Phoenix Hyland | Missoula Sentinel (AA) | 10 | Glacier/Sentinel Dual |
| 47.56 | Brie Mattson | Chester-Joplin-Inverness (C) | 10 | 9C District Meet |
| 47.59 | Reine McCoy | Beaverhead Co./Dillon (A) | 10 | Western A Divisional |
| 47.60 | Emmery Schmidt | Glacier (AA) | 12 | Russ Plicher Western Top 10 |
| 47.63 | Aizalyn Flaten | Great Falls (AA) | 11 | Great Falls Optimist Club Invitational |
| 47.65 | Addison Roush | Helena (AA) | 12 | Skor Dekam Invite |
| 47.66 | Maddison Akins | Huntley Project (B) | 12 | 2025 Midland Roundtable Top 10 |
| 48.01 | Maggie Darr | Gardiner (C) | 11 | Western B/C Divisional |
| 48.07 | Natalie Anderson | Darby (B) | 11 | Western B/C Divisional |
| 48.09 | Kalli Tuma | Plains (B) | 11 | Western B/C Divisional |
| 48.12 | Isabella Grutsch | Missoula Big Sky (AA) | 12 | Big Sky/Butte Dual |
| 48.17 | Bella Triemstra | Manhattan Christian (C) | 12 | Midland Roundtable Top 10 |
| 48.18 | Jaycee Luse | Cut Bank (B) | 11 | Northern B Divisional |
| 48.21 | Kellyn Nelson | Polson (A) | 11 | Western A Divisional |
| 48.21 | June Lay | Helena Capital (AA) | 11 | Helena Crosstown Meet |
| 48.22 | Cadence Graham | Butte (AA) | 10 | Big Sky/Butte Dual |
| 48.30 | Gracelee Banna | Missoula Big Sky (AA) | 12 | Missoula "Greg Rice" City Meet |
| 48.40 | Harper Morris | Lone Peak (B) | 11 | 5B/12C District Meet |
| 48.46 | Brynlee Tucker | Corvallis (A) | 9 | Western A Divisional |
| 48.47 | Perri Sloan | Custer Co./Miles City (A) | 10 | Billings Invite |
| 48.63 | Claire Townsend | Billings West (AA) | 10 | Midland Roundtable Top 10 |
| 48.72 | Blake Hardy | Frenchtown (A) | 10 | Hamilton Bronc Invitational |
| 48.73 | Brooke Howlett | Helena Capital (AA) | 10 | Helena Crosstown Meet |
| 48.75 | Mia Smith | Denton-Geyser-Stanford (C) | 9 | Northern C Divisional |
| 48.78 | Danica Yakos | Drummond (C) | 9 | 6B/13C District Meet |
| 48.80 | Emme Burckley | Billings Senior (AA) | 11 | Eastern AA Divisional |
| 48.82 | Talyn Draayer | Billings West (AA) | 10 | Billings City Meet |
| 48.85 | Grace Hicks | Fergus/Lewistown (A) | 11 | Eastern A Divisional |
| 48.88 | Kate Allen | Corvallis (A) | 10 | Western A Divisional |
| 48.89 | Ava Graham | Beaverhead Co./Dillon (A) | 12 | Sapphire Twilight Meet |