| Mark | Athlete | School | Year | Meet |
|---|
| 44.54 | Ashley McElmurry | Missoula Sentinel (AA) | 12 | State AA |
| 45.69 | Mayjia Horst | Bozeman (AA) | 11 | State AA |
| 45.78 | Audrey McElmurry | Missoula Sentinel (AA) | 10 | State AA |
| 45.84 | Wrenzi Wrzesinski | Baker (B) | 12 | State B |
| 46.24 | Melissa Moreni | Helena Capital (AA) | 11 | State AA |
| 46.49 | Anna Trudnowski | Butte (AA) | 10 | State AA |
| 46.54 | Aubry Grame | Glacier (AA) | 11 | Western Top 10 Meet |
| 46.59 | Macee Murphy | Huntley Project (B) | 9 | State B |
| 46.60 | Keara Burgess | Missoula Big Sky (AA) | 10 | State AA |
| 46.60 | Casey Ehmann | Darby (C) | 12 | State C |
| 46.90 | Mary Corbett | Bozeman (AA) | 12 | State AA |
| 46.92 | Ainsley Shipman | Beaverhead Co./Dillon (A) | 9 | State A |
| 46.94 | Kamryn Scully | Powell Co./Deer Lodge (B) | 12 | State B |
| 47.00 | Teigan Taylor | Fairview (C) | 9 | State C |
| 47.01 | Haven Moss | Missoula Big Sky (AA) | 11 | State AA |
| 47.02 | Gianna Migliaccio | Missoula Big Sky (AA) | 11 | Big Sky Meet 4/26 |
| 47.06 | Allie Wallace | Fort Benton (C) | 10 | State C |
| 47.09 | Cloie Banderob | Billings Senior (AA) | 12 | State AA |
| 47.31 | Skyleigh Thompson | Flathead (AA) | 10 | Archie Roe |
| 47.34 | Lindsey Paulson | Belt (C) | 9 | 8C Districts |
| 47.38 | Gracie Bradley | Colstrip (B) | 9 | Midland Roundtable Top 10 |
| 47.41 | Kaitlyn McColly | Hinsdale (C) | 10 | Eastern C Divisionals |
| 47.47 | Brooke Schraner | Belt (C) | 11 | 8C Districts |
| 47.76 | Amelia Hartshorn | Bozeman (AA) | 10 | State AA |
| 47.77 | Kinzie Peterson | Glacier (AA) | 11 | Western AA Divisional |
| 47.95 | Kailee McCready | Corvallis (A) | 10 | Nelson-Thomas ABC Meet |
| 47.97 | Bella Klein | Roundup (B) | 9 | State B |
| 48.15 | Jasmyn Murphy | Three Forks (B) | 9 | 5B Districts |
| 48.15 | Sidney Gulick | Glacier (AA) | 9 | State AA |
| 48.17 | Olleca Severson | Manhattan (B) | 10 | 5B Districts |
| 48.22 | Jenna Rust | Westby-Grenora (C) | 11 | Sidney Invitational |
| 48.27 | Kendall Lynn | Three Forks (B) | 11 | State B |
| 48.29 | Eliza Thomas | Helena Capital (AA) | 11 | Helena/Capital Crosstown |
| 48.33 | Taylor Brisendine | Glacier (AA) | 10 | Archie Roe |
| 48.45 | Sadie Filius | Havre (A) | 9 | State A |
| 48.50 | Carlee Fryberger | Charlo (C) | 10 | Western Top 10 Meet |
| 48.53 | Allie Delaney | Charlo (C) | 12 | State C |
| 48.63 | Grace Alexander | Jefferson/Boulder (B) | 10 | State B |
| 48.72 | Kennedy Grove | Whitefish (A) | 12 | State A |
| 48.80 | Libby Linder | Helena Capital (AA) | 10 | State AA |
| 49.13 | Anna Cook | Whitefish (A) | 11 | Western A Divisional |
| 49.17 | Rileigh McGree | Butte Central (A) | 9 | Belgrade Senior Night |