| Time | Date | Name | Meet |
|---|---|---|---|
| 42.24 | Feb. 23, 2019 | Payton Sorenson | Mountain Pacific Sports Federation Championships |
| 42.86 | March 3, 2016 | Payton Sorenson | American Short Course Championships - College |
| 42.94 | Feb. 20, 2016 | Payton Sorenson | Mountain Pacific Sports Federation Championships |
| 43.26 | Feb. 21, 2015 | Jake Taylor | Mountain Pacific Sports Federation Championships |
| 43.34 | Feb. 28, 2009 | Gregor Greiner | Mountain West Conference Championships - Day Four - Finals |
| 43.39 | March 15, 2007 | Brett Allen | NCAA Division I Mens Championships |
