| Mark | Athlete | School | Year | Meet |
|---|
| 58.64 | Katelyn Frost | Corvallis (A) | 12 | State A |
| 58.99 | Jaree Mane | Fergus/Lewistown (A) | 11 | State A |
| 59.05 | Cierra Lamey | Beaverhead Co./Dillon (A) | 12 | State A |
| 1:00.17 | Grace Kurtz | Whitefish (A) | 12 | State A |
| 1:00.96 | Holly Andersen | Beaverhead Co./Dillon (A) | 12 | Dillon Invitational |
| 1:01.05 | Miranda Livingston | Columbia Falls (A) | 11 | Northwestern A Divisional |
| 1:01.09 | Kendra Zander | Dawson Co./Glendive (A) | 10 | State A |
| 1:01.31 | Tiara Duford | Polson (A) | 10 | Northwestern A Divisional |
| 1:01.31 | Lyric Devries | Hamilton (A) | 9 | State A |
| 1:01.31 | Lyric Devries | Hamilton (A) | 9 | State A |
| 1:01.62 | Keelie O Brien | Hamilton (A) | 11 | Southwestern A Divisional |
| 1:01.85 | Taylor Ludwig | Laurel (A) | 10 | Eastern A Divisional |