| Poll # | Season | Date | Number 1 |
|---|---|---|---|
| 1 | 1995 | February 7 | Arizona |
| 50 | 1998 | Fresno State | |
| 100 | 2002 | Arizona | |
| 150 | 2006 | Michigan | |
| 200 | 2009 | March 10 | Florida |
| 250 | 2012 | April 3 | California |
| 300 | 2015 | Oregon | |
| 350 | 2018 | April 24 | UCLA |
| 400 | 2022 | March 22 | Oklahoma |
| 450 | 2025 | April 1 | Texas |