| Time | Date | Name | Meet |
|---|---|---|---|
| 44.36 | Dec. 4, 2022 | Nicholas Imig | PN KING 73rd Annual Husky Invitational |
| 44.52 | March 2, 2019 | Greg Raper | Western Athletic Conference Championships |
| 44.56 | Feb. 26, 2011 | Jordan Anderson | Mountain Pacific Sports Federation Championships |
| 44.95 | Feb. 10, 2010 | Jordan Anderson | Pacific Collegiate Swim Conference Championships |
| 46.35 | March 17, 2007 | Gordon Smith | NCAA Division II Championships |
| 46.55 | March 11, 2006 | Gordon Smith | NCAA Division II Championships |
