| Time | Date | Name | Meet |
|---|---|---|---|
| 49.52 | Feb. 20, 2014 | Garrett Cadotte | 14 Nebraska State Championships |
| 50.49 | Feb. 8, 2014 | Garrett Cadotte | 14 Nebraska Non-State Best Times |
| 50.61 | Feb. 24, 2012 | Garrett Cadotte | 12 Nebraska State High School Championships |
| 51.98 | Feb. 24, 2011 | Garrett Cadotte | 11 Nebraska High School Best Times |
| 52.37 | Feb. 27, 2009 | Mitchell Shanahan | 09 Nebraska State Championships |
| 56.53 | Feb. 22, 2008 | Mitchell Shanahan | Nebraska State Championships |
