| Time | Date | Name | Meet |
|---|---|---|---|
| 45.46 | Feb. 19, 2023 | Rommin Adl | Midwest Conference Championships |
| 45.58 | Feb. 19, 2012 | Michael Brus | Midwest Conference Championships |
| 45.59 | Feb. 20, 2011 | Michael Brus | Midwest Conference Championships |
| 47.94 | Jan. 21, 2011 | Michael Brus | Grinnell Invitational |
| 49.25 | Dec. 6, 2008 | Marco Fulgoni | Falcon Invite |
