*Series cancelled due to rain. Bellingham and Eugene declared co-champions.
#Series cancelled due to rain and wet fields. Grays Harbor declared champion.
| Northwest League Champions |
| Year |
Winner |
| 1918 |
Seattle Giants |
| 1919 |
Vancouver Beavers |
| 1920 |
Victoria Islanders |
| 1921 |
Yakima Indians |
| 1922 |
Calgary Bronchos |
| 1923 |
No League |
| 1924 |
No League |
| 1925 |
No League |
| 1926 |
No League |
| 1927 |
No League |
| 1928 |
No League |
| 1929 |
No League |
| 1930 |
No League |
| 1931 |
No League |
| 1932 |
No League |
| 1933 |
No League |
| 1934 |
No League |
| 1935 |
No League |
| 1936 |
No League |
| 1937 |
Tacoma Tigers |
| 1938 |
Bellingham Chinooks |
| 1939 |
Tacoma Tigers |
| 1940 |
Tacoma Tigers |
| 1941 |
Spokane Indians |
| 1942 |
Vancouver Capilanos |
| 1943 |
No League |
| 1944 |
No League |
| 1945 |
No League |
| 1946 |
Wenatchee Chiefs |
| 1947 |
Vancouver Capilanos |
| 1948 |
Spokane Indians |
| 1949 |
Vancouver Capilanos |
| 1950 |
Yakima Bears |
| 1951 |
Spokane Indians |
| 1952 |
Victoria Tyees |
| 1953 |
Spokane Indians |
| 1954 |
Vancouver Capilanos |
| 1955 |
Eugene Emeralds |
| 1956 |
Yakima Bears |
| 1957 |
Wenatchee Chiefs |
| 1958 |
Yakima Bears |
| 1959 |
Yakima Bears |
| 1960 |
Yakima Bears |
| 1961 |
Lewiston Broncs |
| 1962 |
Wenatchee Chiefs |
| 1963 |
Yakima Bears |
| 1964 |
Yakima Bears |
| 1965 |
Tri-City Atoms |
| 1966 |
Tri-City Atoms |
| 1967 |
Medford Giants |
| 1968 |
Tri-City Atoms |
| 1969 |
Rogue Valley Dodgers |
| 1970 |
Coos Bay-North Bend Athletics |
| 1971 |
Tri-City Padres |
| 1972 |
Lewiston Broncs |
| 1973 |
Walla Walla Padres |
| 1974 |
Eugene Emeralds |
| 1975 |
Eugene Emeralds |
| 1976 |
Walla Walla Padres |
| 1977 |
Bellingham Mariners |
| #1978 |
Grays Harbor Loggers |
| 1979 |
Central Oregon Phillies |
| *1980 |
Bellingham Mariners |
| *1980 |
Eugene Emeralds |
| 1981 |
Medford Athletics |
| 1982 |
Salem Angels |
| 1983 |
Medford Athletics |
| 1984 |
Tri-Cities Triplets |
| 1985 |
Everett Giants |
| 1986 |
Bellingham Mariners |
| 1987 |
Spokane Indians |
| 1988 |
Spokane Indians |
| 1989 |
Spokane Indians |
| 1990 |
Spokane Indians |
| 1991 |
Boise Hawks |
| 1992 |
Bellingham Mariners |
| 1993 |
Boise Hawks |
| 1994 |
Boise Hawks |
| 1995 |
Boise Hawks |
| 1996 |
Yakima Bears |
| 1997 |
Portland Rockies |
| 1998 |
Salem-Keizer Volcanoes |
| 1999 |
Spokane Indians |
| 2000 |
Yakima Bears |
| 2001 |
Salem-Keizer Volcanoes |
| 2002 |
Boise Hawks |
| 2003 |
Spokane Indians |
| 2004 |
Boise Hawks |
| 2005 |
Spokane Indians |
| 2006 |
Salem-Keizer Volcanoes |
| 2007 |
Salem-Keizer Volcanoes |
