| 2025 | 6 | 1 | Everett AquaSox | Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2024 | 6 | 1 | Spokane Indians | Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2023 | 6 | 1 | Vancouver Canadians | Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2022 | 6 | 1 | Eugene Emeralds | Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2021 | 6 | 1 | | Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2020 | 8 | 1 | | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2019 | 8 | 2 | Hillsboro Hops | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2018 | 8 | 2 | Eugene Emeralds | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2017 | 8 | 2 | Vancouver Canadians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2016 | 8 | 2 | Eugene Emeralds | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2015 | 8 | 2 | Hillsboro Hops | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2014 | 8 | 2 | Hillsboro Hops | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2013 | 8 | 2 | Vancouver Canadians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Hillsboro Hops,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians |
| 2012 | 8 | 2 | Vancouver Canadians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2011 | 8 | 2 | Vancouver Canadians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2010 | 8 | 2 | Everett AquaSox | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2009 | 8 | 2 | Salem-Keizer Volcanoes | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2008 | 8 | 2 | Spokane Indians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2007 | 8 | 2 | Salem-Keizer Volcanoes | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2006 | 8 | 2 | Salem-Keizer Volcanoes | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2005 | 8 | 2 | Spokane Indians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2004 | 8 | 2 | Boise Hawks | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2003 | 8 | 2 | Spokane Indians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2002 | 8 | 2 | Boise Hawks | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2001 | 8 | 2 | Salem-Keizer Volcanoes | Boise Hawks,Eugene Emeralds,Everett AquaSox,Salem-Keizer Volcanoes,Spokane Indians,Tri-City Dust Devils,Vancouver Canadians,Yakima Bears |
| 2000 | 8 | 2 | Yakima Bears | Boise Hawks,Eugene Emeralds,Everett AquaSox,Portland Rockies,Salem-Keizer Volcanoes,Spokane Indians,Vancouver Canadians,Yakima Bears |
| 1999 | 8 | 2 | Spokane Indians | Boise Hawks,Eugene Emeralds,Everett AquaSox,Portland Rockies,Salem-Keizer Volcanoes,Southern Oregon Timberjacks,Spokane Indians,Yakima Bears |
| 1998 | 8 | 2 | Salem-Keizer Volcanoes | Boise Hawks,Eugene Emeralds,Everett AquaSox,Portland Rockies,Salem-Keizer Volcanoes,Southern Oregon Timberjacks,Spokane Indians,Yakima Bears |
| 1997 | 8 | 2 | Portland Rockies | Boise Hawks,Eugene Emeralds,Everett AquaSox,Portland Rockies,Salem-Keizer Volcanoes,Southern Oregon Timberjacks,Spokane Indians,Yakima Bears |
| 1996 | 8 | 2 | Yakima Bears | Bellingham Giants,Boise Hawks,Eugene Emeralds,Everett AquaSox,Portland Rockies,Southern Oregon Timberjacks,Spokane Indians,Yakima Bears |
| 1995 | 8 | 2 | Boise Hawks | Bellingham Giants,Boise Hawks,Eugene Emeralds,Everett AquaSox,Portland Rockies,Southern Oregon A's,Spokane Indians,Yakima Bears |
| 1994 | 8 | 2 | Boise Hawks | Bellingham Mariners,Bend Rockies,Boise Hawks,Eugene Emeralds,Everett Giants,Southern Oregon A's,Spokane Indians,Yakima Bears |
| 1993 | 8 | 2 | Boise Hawks | Bellingham Mariners,Bend Rockies,Boise Hawks,Eugene Emeralds,Everett Giants,Southern Oregon A's,Spokane Indians,Yakima Bears |
| 1992 | 8 | 2 | Bellingham Mariners | Bellingham Mariners,Bend Rockies,Boise Hawks,Eugene Emeralds,Everett Giants,Southern Oregon A's,Spokane Indians,Yakima Bears |
| 1991 | 8 | 2 | Bend Bucks | Bellingham Mariners,Bend Bucks,Boise Hawks,Eugene Emeralds,Everett Giants,Southern Oregon A's,Spokane Indians,Yakima Bears |
| 1990 | 8 | 2 | Spokane Indians | Bellingham Mariners,Bend Bucks,Boise Hawks,Eugene Emeralds,Everett Giants,Southern Oregon A's,Spokane Indians,Yakima Bears |
| 1989 | 8 | 2 | Spokane Indians | Bellingham Mariners,Bend Bucks,Boise Hawks,Eugene Emeralds,Everett Giants,Salem Dodgers,Southern Oregon A's,Spokane Indians |
| 1988 | 8 | 2 | Spokane Indians | Bellingham Mariners,Bend Bucks,Boise Hawks,Eugene Emeralds,Everett Giants,Salem Dodgers,Southern Oregon A's,Spokane Indians |
| 1987 | 8 | 2 | Spokane Indians | Bellingham Mariners,Bend Phillies,Boise Hawks,Eugene Emeralds,Everett Giants,Medford A's,Salem Angels,Spokane Indians |
| 1986 | 8 | 2 | Bellingham Mariners | Bellingham Mariners,Bend Phillies,Eugene Emeralds,Everett Giants,Medford A's,Salem Angels,Spokane Indians,Tri-City Triplets |
| 1985 | 8 | 2 | Everett Giants | Bellingham Mariners,Bend Phillies,Eugene Emeralds,Everett Giants,Medford A's,Salem Angels,Spokane Indians,Tri-City Triplets |
| 1984 | 8 | 2 | Tri-City Triplets | Bellingham Mariners,Bend Phillies,Eugene Emeralds,Everett Giants,Medford A's,Salem Angels,Spokane Indians,Tri-City Triplets |
| 1983 | 8 | 2 | Medford A's | Bellingham Mariners,Bend Phillies,Eugene Emeralds,Medford A's,Salem Angels,Spokane Indians,Tri-City Triplets,Walla Walla Padres |
| 1982 | 6 | 2 | Salem Angels | Bellingham Mariners,Bend Phillies,Eugene Emeralds,Medford A's,Salem Angels,Walla Walla Padres |
| 1981 | 6 | 2 | Medford A's | Bellingham Mariners,Bend Phillies,Eugene Emeralds,Medford A's,Salem Senators,Walla Walla Padres |
| 1980 | 8 | 2 | Bellingham MarinersEugene Emeralds | Bellingham Mariners,Central Oregon Phillies,Eugene Emeralds,Grays Harbor Loggers,Medford A's,Salem Senators,Victoria Mussels,Walla Walla Padres |
| 1979 | 8 | 2 | Central Oregon Phillies | Bellingham Mariners,Central Oregon Phillies,Eugene Emeralds,Grays Harbor Loggers,Medford A's,Salem Senators,Victoria Mussels,Walla Walla Padres |
| 1978 | 8 | 2 | Grays Harbor Loggers | Bellingham Mariners,Bend Timber Hawks,Boise Buckskins,Eugene Emeralds,Grays Harbor Loggers,Salem Senators,Victoria Mussels,Walla Walla Padres |
| 1977 | 6 | 2 | | Bellingham Mariners,Eugene Emeralds,Grays Harbor Loggers,Portland Mavericks,Salem Senators,Walla Walla Padres |
| 49 record(s) |