| Year | School | Time |
|---|---|---|
| 2022 | Cody | 4:13.74 |
| 2021 | Campbell County | 4:14.48 |
| 2020 | Cheyenne Central | 4:08.29 |
| 2019 | Thunder Basin | 4:11.56 |
| 2018 | Laramie | 4:07.18 |
| 2017 | Campbell County | 4:05.68 |
| 2016 | Campbell County | 4:09.34 |
| 2015 | Laramie | 4:08.40 |
| 2014 | Laramie | 4:11.44 |
| 2013 | Laramie | 4:09.69 |
| 2012 | Cheyenne Central | 4:11.67 |
| 2011 | Campbell County | 4:15.43 |
| 2010 | Laramie | 4:18.76 |
| 2009 | Cheyenne Central | 4:12.26 |
| 2008 | Cheyenne Central | 4:09.35 |
| 2007 | Cheyenne Central | 4:12.35 |
| 2006 | Cody | 4:16.50 |