| Time | Date | Name | Meet |
|---|---|---|---|
| 57.22 | Feb. 20, 2016 | Maria Venneri | Midwest Conference Championships |
| 57.32 | Feb. 19, 2016 | Maria Venneri | Midwest Conference Championships |
| 57.95 | Feb. 13, 2015 | Maria Venneri | Midwest Conference Championships |
| 1:00.58 | Feb. 16, 2013 | Sara Hannemann | Midwest Conference Championships |
| 1:01.15 | Feb. 18, 2012 | Nikki Pyle | Midwest Conference Championships |
| 1:01.64 | Feb. 17, 2012 | Nikki Pyle | Midwest Conference Championships |
| 1:02.02 | Feb. 19, 2011 | Sara Hannemann | Midwest Conference Championships |
| 1:02.22 | Feb. 18, 2011 | Sara Hannemann | Midwest Conference Championships |
| 1:02.82 | Feb. 5, 2011 | Imelda Wistey | Grinnell vs. Nebraska (Club) |
| 1:04.59 | Dec. 4, 2010 | Nikki Pyle | Pioneer (Grinnell) Invitational |
| 1:06.11 | Jan. 15, 2010 | Morgan Horton | Grinnell Invitational |
