| Mark | Athlete | School | Year | Meet |
|---|
| 57.07 | Marlow Schulz | Whitefish (A) | 10 | State A Track Meet |
| 58.49 | Sadi Henderson | Corvallis (A) | 10 | Southwestern A Divisional |
| 58.78 | Lakyn Connors | Corvallis (A) | 11 | 5-5 Seeley-Swan Invitational |
| 59.67 | Amanda Foley | Whitefish (A) | 12 | Northwestern A Divisional |
| 59.74 | Sammy Elliott | Billings Central (A) | 11 | Midland Roundtable Top 10 Meet |
| 1:00.33 | Bailey Dooper | Laurel (A) | 12 | Midland Roundtable Top 10 Meet |
| 1:00.97 | Jordyn Yarborough | Park/Livingston (A) | 12 | Midland Roundtable Top 10 Meet |
| 1:01.47 | Kasey Robson | Dawson Co./Glendive (A) | 12 | Eastern A Divisional |