| Mark | Athlete | School | Year | Meet |
|---|
| 56.51 | Liz Harper | Missoula Sentinel (AA) | 11 | Western AA Divisional |
| 57.07 | Marlow Schulz | Whitefish (A) | 10 | State A Track Meet |
| 57.14 | Tess Brenneman | Flathead (AA) | 12 | Western AA Divisional |
| 57.18 | Elle Tinkle | Missoula Big Sky (AA) | 12 | Western AA Divisional |
| 57.23 | Danielle Aragon | Billings Senior (AA) | 12 | State AA Track Meet |
| 58.49 | Sadi Henderson | Corvallis (A) | 10 | Southwestern A Divisional |
| 58.78 | Lakyn Connors | Corvallis (A) | 11 | 5-5 Seeley-Swan Invitational |
| 59.01 | Cate Hanna | Billings West (AA) | 11 | Midland Roundtable Top 10 Meet |
| 59.21 | Alyssa Espinoza | Billings West (AA) | 11 | Eastern AA Divisional |
| 59.24 | Marisa Sanchez | Helena Capital (AA) | 11 | Western Montana Top 10 |
| 59.38 | Shealynn Wacaser | Billings Skyview (AA) | 10 | Midland Roundtable Top 10 Meet |
| 59.65 | Ashley Olson | Plentywood (B) | 11 | Miles City Invitational |
| 59.67 | Amanda Foley | Whitefish (A) | 12 | Northwestern A Divisional |
| 59.74 | Sammy Elliott | Billings Central (A) | 11 | Midland Roundtable Top 10 Meet |
| 59.88 | Josey Smiedala | Helena (AA) | 9 | Optimist Track Meet |
| 1:00.02 | Lila Hamburg | Billings West (AA) | 11 | State AA Track Meet |
| 1:00.02 | Martha Dembek | Winnett-Grass Range (C) | 11 | 7C Districts |
| 1:00.30 | Kaitlyn Oliver | Helena (AA) | 11 | Western Montana Top 10 |
| 1:00.33 | Bailey Dooper | Laurel (A) | 12 | Midland Roundtable Top 10 Meet |
| 1:00.34 | Jessica Scarber | Powder River Co./Broadus (C) | 11 | Forsyth Invitational |
| 1:00.62 | Allison Morrison | Helena (AA) | 12 | CMR-Helena Dual |
| 1:00.68 | Ellen Ruby | Missoula Hellgate (AA) | 11 | Western AA Divisional |
| 1:00.73 | Katie McKay | Missoula Big Sky (AA) | 12 | Big Sky Meet |
| 1:00.74 | Rachel Stewart | Great Falls (AA) | 12 | Havre-Great Falls Dual |
| 1:00.78 | Kinsey Schwers | Harlowton (C) | 10 | Billings West Invitational |
| 1:00.96 | Madi Rembe | Great Falls CMR (AA) | 11 | State AA Track Meet |
| 1:00.97 | Jordyn Yarborough | Park/Livingston (A) | 12 | Midland Roundtable Top 10 Meet |
| 1:01.20 | Jaclyn Rauthe | Flathead (AA) | 11 | State AA Track Meet |
| 1:01.26 | Erica McLeod | Butte (AA) | 10 | Eastern AA Divisional |
| 1:01.33 | KeAnna Conley | Seeley-Swan (C) | 10 | State C Track Meet |
| 1:01.46 | Carly Rech | Sweet Grass Co./Big Timber (B) | 11 | 5B Districts |
| 1:01.47 | Kasey Robson | Dawson Co./Glendive (A) | 12 | Eastern A Divisional |
| 1:01.52 | Hanna Felice | Great Falls (AA) | 9 | Eastern AA Divisional |
| 1:01.72 | Selene Johnson | Sweet Grass Co./Big Timber (B) | 12 | Stillwater Invitational |
| 1:01.76 | Madison Seaman | Flathead (AA) | 9 | Western AA Divisional |
| 1:01.82 | Analeese Warner | Billings Skyview (AA) | 10 | Eastern AA Divisional |
| 1:01.84 | Hannah Porch | Florence-Carlton (B) | 9 | Western Montana Top 10 |
| 1:01.91 | Allison Hert | Colstrip (B) | 9 | Southern B Divisional |
| 1:02.10 | Tess Porch | Florence-Carlton (B) | 10 | 6B Districts |
| 1:02.41 | Kara Gerke | Belt (C) | 10 | 8C Districts |
| 1:02.41 | Kathryn Smit | Manhattan Christian (C) | 12 | State C Track Meet |
| 1:02.72 | Dusty Taber | Harlowton (C) | 10 | Southern C Divisional |