| Mark | Athlete | School | Year | Meet |
|---|
| 44.66 | Maeve Ingelfinger | Whitefish (A) | 10 | State A |
| 44.67 | Ainsley Shipman | Beaverhead Co./Dillon (A) | 12 | State A |
| 44.97 | Olivia Lewis | Corvallis (A) | 10 | Western A Divisional |
| 46.12 | Hailey Ells | Whitefish (A) | 10 | Western A Divisional |
| 47.27 | Rylee Armstrong | Fergus/Lewistown (A) | 11 | Eastern A Divisional |
| 47.46 | Rylee Herbstritt | Corvallis (A) | 11 | State A |
| 47.46 | Lily Tanko | Bigfork (A) | 12 | Western B Divisional |
| 47.53 | Lauryn Petersen | Beaverhead Co./Dillon (A) | 12 | Russ Plicher Top 10 |
| 48.46 | Rileigh McGree | Butte Central (A) | 12 | Butte-Bozeman-Gallatin Tri |