| Year | School | Time |
|---|---|---|
| 2021 | Thunder Basin | 3:31.28 |
| 2020 | Sheridan | 3:32.27 |
| 2019 | Evanston | 3:33.31 |
| 2018 | Cheyenne Central | 3:32.23 |
| 2017 | Laramie | 3:26.41 |
| 2016 | Campbell County | 3:28.81 |
| 2015 | Rock Springs | 3:30.77 |
| 2014 | Kelly Walsh | 3:26.76 |
| 2013 | Campbell County | 3:29.39 |
| 2012 | Cheyenne Central | 3:33.14 |
| 2011 | Cheyenne Central | 3:32.62 |
| 2010 | Green River | 3:34.74 |
| 2009 | Campbell County | 3:33.98 |
| 2008 | Cody | 3:34.54 |
| 2007 | Laramie | 3:35.58 |
| 2006 | Campbell County | 3:38.51 |