| Time | Date | Name | Meet |
|---|---|---|---|
| 53.50 | Feb. 19, 2021 | Mahmoud ELGAYAR | Rocky Mountain Athletic Conference Championships |
| 54.07 | Feb. 16, 2018 | Joshua Bedford | Rocky Mountain Athletic Conference Championships |
| 55.21 | Feb. 10, 2017 | Joshua Bedford | Rocky Mountain Athletic Conference Championships |
| 55.90 | Feb. 12, 2016 | Joshua Bedford | Rocky Mountain Athletic Conference Championships |
| 56.53 | Feb. 15, 2013 | Brett Lowe | Rocky Mountain Athletic Conference Championships |
| 58.61 | Feb. 17, 2012 | Kirk O'Connell | Rocky Mountain Athletic Conference Championships |
| 59.82 | Oct. 8, 2010 | Andy Gibbons | Intermountain Shootout |
| 1:01.62 | Oct. 2, 2010 | Andy Gibbons | Adams State Duals |
