| Mark | Athlete | School | Year | Meet |
|---|
| 59.55 | Haile Norred | Bigfork (A) | 10 | Archie Roe Invitational |
| 59.89 | Madison Patrick | Park/Livingston (A) | 11 | MidLand Round Table Top Ten |
| 1:00.14 | Lydia Kryshak | Whitefish (A) | 10 | ABC Invitational |
| 1:00.71 | Heidi Nisly | Corvallis (A) | 11 | MHSA Class A Championships |
| 1:00.76 | Mattison McAnaly | Bigfork (A) | 12 | MHSA Class B Championships |
| 1:00.84 | Penny Jessop | Corvallis (A) | 11 | Western A Divisionals |
| 1:00.95 | Mariah Wittman | Billings Central (A) | 12 | John Polich Cowgirl/Cowboy Invitational Track Meet |
| 1:00.99 | Taylor Ludwig | Laurel (A) | 11 | MHSA Class A Championships |
| 1:01.83 | Lauren Schulz | Whitefish (A) | 9 | Western A Divisionals |
| 1:01.96 | Jaree Mane | Fergus/Lewistown (A) | 12 | Eastern A Super Divisionals |
| 1:02.00 | Bryn Morley | Bigfork (A) | 10 | Eureka Invitational |