- 1926 – College of Idaho
- 1927 – College of Idaho
- 1928 – Whitman
- 1929 – Willamette
- 1930 – Whitman
- 1931 – Whitman
- 1932 – Puget Sound
- 1933 – Puget Sound
- 1934 – Willamette
- 1935 – Linfield and Willamette
- 1936 – Willamette
- 1937 – Willamette
- 1938 – Pacific (OR) and Willamette
- 1939 – Pacific
- 1940 – Willamette
- 1941 – Willamette
- 1942 – Willamette
- 1943 – No champion
- 1944 – No champion
- 1945 – No champion
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- 1946 – Willamette
- 1947 – Willamette
- 1948 – College of Idaho
- 1949 – College of Idaho, Lewis & Clark, and Pacific (OR)
- 1950 – Lewis & Clark
- 1951 – Lewis & Clark and Pacific (OR)
- 1952 – Lewis & Clark and Pacific (OR)
- 1953 – College of Idaho
- 1954 – College of Idaho, Lewis & Clark, and Willamette
- 1955 – College of Idaho and Lewis & Clark
- 1956 – Linfield
- 1957 – Linfield
- 1958 – Willamette
- 1959 – Willamette
- 1960 – Willamette
- 1961 – Linfield
- 1962 – Linfield
- 1963 – Lewis & Clark
- 1964 – Linfield
- 1965 – Linfield
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- 1966 – Lewis & Clark
- 1967 – Lewis & Clark, Linfield, and Willamette
- 1968 – Willamette
- 1969 – Lewis & Clark, Linfield, Pacific Lutheran, and Whitman
- 1970 – Linfield
- 1971 – Linfield
- 1972 – Linfield
- 1973 – Pacific Lutheran
- 1974 – Linfield
- 1975 – Linfield, Pacific Lutheran, and Whitworth (WA)
- 1976 – Linfield
- 1977 – Linfield
- 1978 – Linfield
- 1979 – Pacific Lutheran
- 1980 – Linfield
- 1981 – Pacific Lutheran
- 1982 – Linfield
- 1983 – Pacific Lutheran
- 1984 – Linfield
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