| Time | Date | Name | Meet |
|---|---|---|---|
| 46.83 | March 16, 2023 | Tanner Filion | NCAA Division III Championship |
| 47.56 | March 19, 2015 | Karl Mering | NCAA Division III Championships |
| 47.91 | March 20, 2014 | Karl Mering | NCAA Division III Championships |
| 48.20 | Feb. 15, 2014 | Karl Mering | Northwest Conference Championships |
| 48.29 | Dec. 7, 2013 | Karl Mering | Husky Invitational |
| 48.59 | Feb. 9, 2013 | Karl Mering | Northwest Conference Championships |
| 49.11 | Dec. 1, 2012 | Karl Mering | Husky Invitational |
| 49.70 | Dec. 3, 2011 | Karl Mering | Husky Invitational |
| 51.67 | Nov. 19, 2011 | Karl Mering | Northwest Invitational |
| 53.33 | Feb. 26, 2011 | Matt Liedtke | Northwest Conference Championships |
| 53.84 | Feb. 13, 2010 | Matt Liedtke | Northwest Conference Championships |
| 54.77 | Jan. 23, 2010 | Matt Liedtke | Whitman vs. Whitworth |
| 57.40 | Nov. 7, 2008 | Matt Rowett | Whitman @Linfield |
