| Time | Date | Name | Meet |
|---|---|---|---|
| 45.75 | March 17, 2023 | Tanner Filion | NCAA Division III Championship |
| 46.74 | Feb. 10, 2023 | Tanner Filion | Northwest Conference Championships |
| 46.89 | March 18, 2022 | Tanner Filion | NCAA Division III Championship |
| 47.74 | Feb. 12, 2022 | Tanner Filion | Northwest Conference Championships |
| 48.08 | Feb. 11, 2022 | Tanner Filion | Northwest Conference Championships |
| 49.28 | Dec. 5, 2021 | Tanner Filion | Logger Invitational |
| 49.53 | Dec. 4, 2021 | Tanner Filion | Logger Invitational |
| 49.93 | Feb. 15, 2020 | Tanner Filion | Northwest Conference Championships |
| 50.12 | Feb. 14, 2020 | Tanner Filion | Northwest Conference Championships |
| 50.64 | Feb. 14, 2015 | SAM Starr | Northwest Conference Championships |
| 50.99 | Feb. 15, 2014 | SAM Starr | Northwest Conference Championships |
| 51.94 | Feb. 8, 2013 | SAM Starr | Northwest Conference Championships |
| 52.86 | Feb. 11, 2012 | Kevin O'Leary | Northwest Conference Championships |
| 53.13 | Feb. 10, 2012 | Nicholas Win | Northwest Conference Championships |
| 54.04 | Feb. 13, 2010 | Eric Molnar | Northwest Conference Championships |
| 55.12 | Feb. 12, 2010 | Eric Molnar | Northwest Conference Championships |
| 56.34 | Nov. 15, 2008 | Noel Sollom-Brotherton | Pacific Lutheran @Whitman |
| 56.44 | Nov. 7, 2008 | Noel Sollom-Brotherton | Whitman @Linfield |
