| Year | Conference Champion(s) |
|---|---|
| 1987 | California (S), Washington (N) |
| 1988 | Stanford (S), Washington (N) |
| 1989 | Stanford (S), Washington (N) |
| 1990 | Stanford (S), Washington (N) |
| 1991 | Stanford (S), Washington (N) |
| 1992 | Stanford (S), Washington (N) |
| 1993 | Stanford (S), Washington (N) |
| 1994 | Stanford (S), Washington (N) |
| 1995 | Stanford (S), Washington State (N) |
| 1996 | Stanford (S), Washington State (N) |
| 1997 | Stanford (S), Washington (N) |
| 1998 | Stanford |
| 1999 | Stanford |
| 2000 | Stanford |
| 2001 | Stanford |
| 2002 | Stanford |
| 2003 | Stanford |
| 2004 | Stanford |
| 2005 | Stanford |
| 2006 | Stanford |
| 2007 | Stanford |
| 2008 | Stanford, UCLA |
| 2009 | USC |
| 2010 | Stanford |
| 2011 | Stanford |
| 2012 | Stanford, USC |
| 2013 | USC |
| 2014 | California |
| 2015 | USC |
| 2016 | Stanford |
| 2017 | Stanford |
| 2018 | Stanford |
| 2019 | Stanford |
| 2020 | season canceled in March due to COVID-19 global pandemic |
| 2021 | California |
Irvin
Conference Championships (28)
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