| Year | School | Time |
|---|---|---|
| 2021 | Sheridan | 3:43.38 |
| 2020 | Laramie | 3:41.06 |
| 2019 | Natrona | 3:44.34 |
| 2018 | Rock Springs | 3:39.66 |
| 2017 | Not contested | |
| 2016 | Not contested | |
| 2015 | Not contested | |
| 2014 | Not contested | |
| 2013 | Not contested | |
| 2012 | Not contested | |
| 2011 | Not contested | |
| 2010 | Not contested | |
| 2009 | Not contested | |
| 2008 | Not contested | |
| 2007 | Not contested | |
| 2006 | Not contested |