- Riverside, California, 2014
- Las Vegas, Nevada, 2013
- Boise, Idaho, 2012
- San Diego, California, 2011
- Ashland, Oregon, 2010
- San Francisco, California, 2009
- Waimea, Hawaii, 2008
- Boise, Idaho, 2007
- San Diego, California, 2006
- Ashland, Oregon, 2005
- Logan, Utah, 2004
- San Francisco, California, 2003
- Waimea, Hawaii, 2002
- Irvine, California, 2001
- Ashland, Oregon, 2000
- San Francisco, California, 1999
- Logan, Utah, 1998
- Corvallis, Oregon, 1997
- San Jose, California, 1996
- Vancouver, British Columbia, 1995
- San Francisco, California, 1994
- Missoula, Montana, 1993
- Santa Barbara, California, 1992
- Logan, Utah, 1991
- Davis, California, 1990
- Chico, California, 1989
- Corvallis, Oregon, 1988
- San Diego, California, 1987
- Vancouver, British Columbia, 1986
- Missoula, Montana, 1985
- San Francisco, California, 1984
- Logan, Utah, 1983
- Santa Barbara, California, 1982
- Eugene, Oregon, 1981
- Davis, California, 1980
- Moscow, Idaho, 1979
- Seattle, Washington, 1978
- San Francisco, California, 1977
- Missoula, Montana, 1976
- Corvallis, Oregon, 1975
- Irvine, California, 1974
- Salt Lake City, Utah, 1973
- Eugene, Oregon, 1972
- San Diego, California, 1971
- Berkeley, California, 1970
- Pullman, Washington, 1969
- Logan, Utah, 1968
- Los Angeles, California, 1967
- Seattle, Washington, 1966
- Riverside, California, 1965
- Vancouver, British Columbia, 1964
- Stanford, California, 1963
- Corvallis, Oregon, 1962
- Davis, California, 1961
- Eugene, Oregon, 1960
- San Diego, California, 1959
- Logan, Utah, 1958
- Stanford, California, 1957
- Seattle, Washington, 1956
- Pasadena, California, 1955
- Pullman, Washington, 1954
- Santa Barbara, California, 1953
- Corvallis, Oregon, 1952
- Los Angeles, California, 1951
- Salt Lake City, Utah, 1950
- Vancouver, British Columbia, 1949
- Berkeley, California, 1948
- San Diego, California, 1947
- Reno, Nevada, 1946
- Salt Lake City, Utah, 1942
- Pasadena, California, 1941
- Seattle, Washington, 1940
- Palo Alto, California, 1939
- San Diego, California, 1938
- Denver, Colorado, 1937
- Seattle, Washington, 1936
- Los Angeles, California, 1935
- Berkeley, California, 1934
- Salt Lake City, Utah, 1933
- Pullman, Washington, 1932
- Pasadena, California, 1931
- Eugene, Oregon, 1930
- Berkeley, California, 1929
- Claremont, California, 1928
- Reno, Nevada, 1927
- Mills College, California, 1926
- Portland, Oregon, 1925
- Palo Alto, California, 1924
- Los Angeles, California, 1923
- Salt Lake City, Utah, 1922
- Berkeley, California, 1921
- Seattle, Washington, 1920
- Pasadena, California, 1919
- Palo Alto, California, 1918
- San Diego, California, 1916