One year later, Washington State College (now Washington State University) joined the league, followed by Stanford University in 1918.
In 1922, the PCC expanded to eight teams with the admission of USC and Idaho. Montana joined the Conference in 1924, and in 1928, the PCC grew to 10 members with the addition of UCLA.
For many years, the conference split into two divisions for basketball -- a Southern Division comprising the four California schools and a Northern Division comprising the six schools in the Pacific Northwest.
In 1950, Montana departed to join the Mountain States Conference. The PCC continued as a nine-team league through 1958.
On July 1, 1959 the Athletic Association of Western Universities was formed, with Cal, Stanford, UCLA, USC, and Washington as charter members. The conference also was popularly known as the Big Five from 1960-1962 Washington State University joined in 1962. The conference was then known as the Big Six.
In 1968, the AAWU renamed itself the Pacific-8 Conference, or Pac-8 for short.
The Pac-10 claims the PCC's history as its own. It inherited the PCC's berth in the Rose Bowl, and the eight largest schools in the old PCC all eventually joined the new league. However, the older league had a separate charter.
The Pac-10 is one of the founding members of the Mountain Pacific Sports Federation, a conference organized to provide competition in non-revenue Olympic sports. All Pac-10 members participate in at least one MPSF sport, and for certain sports, the Pac-10 admits certain schools as Associate Members (which currently are San Diego State for men's soccer, and UC Davis, Cal Poly San Luis Obispo, Boise State, Cal State Fullerton, Portland State, and Cal State Bakersfield for wrestling).
The conference expressed interest in admitting Texas after the collapse of the Southwest Conference. Texas expressed an interest in joining a strong academic conference, but joined three fellow SWC schools in forming the Big 12 Conference in 1996.
Of Division I conferences, only the Ivy League has maintained its current membership for a longer time than the Pac-10.
The Pac-10 is an anomaly in college sports, in that each school within the conference has its own in-state, conference rivalry. One is an intracity rivalry (UCLA-USC), and another is within the same metropolitan area (Cal-Stanford). These rivalries (and the name given to the football forms) are:
There are other notable football rivalries within the Pac-10 conference.
All of the California schools consider each other major rivals, due to the culture clash between Northern and Southern California. USC and Stanford have long-standing football grudge as the only two private institutions in the conference . Cal and UCLA have a rivalry rooted in their shared history as the top programs within the University of California system. Cal and USC also have a long history, having played each other every year in football since 1916.
Oregon and Washington also have an unofficial rivalry (despite recent efforts to give it the name "The Cascade Clash"). All of the Northwest schools consider each other as rivals due to the proximity and long history.
The University of Arizona and the University of New Mexico have a recently renewed rivalry game, based upon when they were both members of the Western Athletic Conference and both states were territories before being admitted as states. They played for the Kit Carson Rifle trophy, which was no longer used starting with their meeting in the 1997 Insight Bowl.
USC and Notre Dame have an intersectional rivalry (See Notre Dame-USC rivalry). The games in Indiana are played in mid-October, while the games in Los Angeles are usually played in late November.
With the NCAA permanently approving 12-game schedules in college football in 2006, the Pac-10 — alone among major conferences in doing so — went to a nine-game conference schedule in which member schools now play each conference opponent every year. Previously, the schools did not play one non-rival opponent, resulting in an eight-game conference schedule (4 home games and 4 away).
During the 1970s, UCLA and Notre Dame had an intense men's basketball rivalry. For several years, it was the only nonconference game in Division I basketball that was played twice a season (home-and-home). Unquestionably, the most famous game in the rivalry was on January 19, 1974, when Notre Dame scored the last 12 points of the game to nip UCLA and end the Bruins' record 88-game winning streak. This rivalry is now dormant, partly because Notre Dame is no longer independent in sports other than football.
In Baseball, there are intense rivalries between the four southern schools. Arizona, Arizona State, USC and UCLA have long and successful histories in baseball and all have won national titles in the sport. The most intense series is widely regarded to be the "Basebrawl" series between #97 USC and #95 Arizona State in 1990. Arizona State swept the series and in the final game a bench clearing brawl spread quickly to the stands and made national headlines. Several were injured and riot police were called to end the fracas.
Washington and California have a longstanding rivalry in men's crew as the two traditionally dominant programs on the West Coast.
The campuses of Washington State University and the University of Idaho are eight miles apart, creating a natural border war. Recently, the football rivalry has been dubbed Battle of the Palouse.
Due to the unique geographic nature of the Pac-10 teams, the teams travel in pairs for road basketball games. For example, on Thursday, February 28, 2008, USC played Arizona and UCLA played Arizona State. Two nights later the teams switched and USC played Arizona State and UCLA played Arizona. The teams are paired as followed: USC and UCLA (the L.A. teams), Arizona and Arizona State (the Arizona teams), Cal and Stanford (the Bay Area teams), Washington and Washington State (the Washington teams), and Oregon and Oregon State (the Oregon teams). Usually, the games are played on Thursdays and Saturdays with a game or occasionally two on Sundays for television purposes.
| School | Football stadium | Capacity | Basketball arena | Capacity | Baseball stadium | Capacity |
|---|---|---|---|---|---|---|
| Arizona | Arizona Stadium | 57,803 | McKale Center | 14,545 | Kindall Field | 6,500 |
| Arizona State | Sun Devil Stadium at Frank Kush Field | 71,706 | Wells Fargo Arena | 14,198 | Packard Stadium | over 4,000 |
| California | California Memorial Stadium | 71,799 | Haas Pavilion | 11,877 | Evans Diamond | 2,500 |
| Oregon | Autzen Stadium at Rich Brooks Field | 54,000 | McArthur Court | 9,087 | PK Park ** Resumes play in 2008-09 | 4,000-5,000 projected |
| Oregon State | Reser Stadium | 45,674 | Gill Coliseum | 10,400 | Goss Stadium at Coleman Field | 2,000 |
| Stanford | Stanford Stadium | 50,000 | Maples Pavilion | 7,233 | Sunken Diamond | 4,000 |
| UCLA | Rose Bowl | 91,936 | Pauley Pavilion | 12,819 | Jackie Robinson Stadium | 1,250 |
| USC | Los Angeles Memorial Coliseum | 93,607 | Galen Center | 10,258 | Dedeaux Field | more than 1,800 |
| Washington | Husky Stadium | 72,500 | Bank of America Arena at Hec Edmundson Pavilion | 10,000 | Husky Ballpark | 1,500 |
| Washington State | Martin Stadium | 40,000 | Beasley Coliseum | 12,058 | Bailey-Brayton Field | 3,500 |
The last divisional playoff was in the 1954-55 season. After that, there was no divisional play and all teams played each other in a round robin competition. From the 1955-56 season through the 1958-59 season, the regular season conference champion was awarded the NCAA tournament berth from the PCC. In the case of a tie, a tie breaker rule was used to determine the NCAA tournament representative.
Beginning with the 1975 NCAA Men's Division I Basketball Tournament, the Pac-10 would usually place at least one other at-large team in the tournament.
By the 1985-86 season, the Pac-10 was one of three remaining conferences that gave their automatic NCAA tournament bid to the regular season round-robin champion. The other two conferences were the Ivy League and the Big Ten Conference.
The modern Pacific-10 Conference Men's Basketball Tournament format began in 1987. It was dropped after 1990 upon opposition from coaches and poor revenue and attendance.
The tournament was restarted by a 8-2 vote of the athletic directors of the conference in 2000 after determining that a tournament would help increase exposure of the conference and help the seeding of the schools in the NCAA tournament.
| Season | Conference Champion (#) | Tournament Champion (#) |
|---|---|---|
| 1915-16 | California (1) Oregon State (1) | |
| 1916-17 | Washington State (1) | |
| 1918-19 | Oregon (1) | |
| 1919-20 | Stanford (1) | |
| 1920-21 | California (2) Stanford (2) | |
| 1921-22 | Idaho (1) | |
| 1922-23 | Idaho (2) | |
| 1923-24 | California (3) | |
| 1924-25 | California (4) | |
| 1925-26 | California (5) | |
| 1926-27 | California (6) | |
| 1927-28 | USC (1) | |
| 1928-29 | California (7) | |
| 1929-30 | USC (2) | |
| 1930-31 | Washington (1) | |
| 1931-32 | California (8) | |
| 1932-33 | Oregon State (2) | |
| 1933-34 | Washington (2) | |
| 1934-35 | USC (3) | |
| 1935-36 | Stanford (3) | |
| 1936-37 | Stanford (4) | |
| 1937-38 | Stanford (5) | |
| 1938-39 | Oregon (2) | |
| 1939-40 | USC (4) | |
| 1940-41 | Washington State (2) | |
| 1941-42 | Stanford (6) | |
| 1942-43 | Washington (3) | |
| 1943-44 | California (9) Washington (4) | |
| 1944-45 | Oregon (3) UCLA (1) | |
| 1945-46 | California (10) | |
| 1946-47 | Oregon State (3) | |
| 1947-48 | Washington (5) | |
| 1948-49 | Oregon State (4) | |
| 1949-50 | UCLA (2) | |
| 1950-51 | Washington (6) | |
| 1951-52 | UCLA (3) | |
| 1952-53 | Washington (7) | |
| 1953-54 | USC (5) | |
| 1954-55 | Oregon State (5) | |
| 1955-56 | UCLA (4) | |
| 1956-57 | California (11) | |
| 1957-58 | California (12) Oregon State (6) | |
| 1958-59 | California (13) | |
| 1959-60 | California (14) | |
| 1960-61 | USC (6) | |
| 1961-62 | UCLA (5) | |
| 1962-63 | Stanford (7) UCLA (6) | |
| 1963-64 | UCLA (7) | |
| 1964-65 | UCLA (8) | |
| 1965-66 | Oregon State (7) | |
| 1966-67 | UCLA (9) | |
| 1967-68 | UCLA (10) | |
| 1968-69 | UCLA (11) | |
| 1969-70 | UCLA (12) | |
| 1970-71 | UCLA (13) | |
| 1971-72 | UCLA (14) | |
| 1972-73 | UCLA (15) | |
| 1973-74 | UCLA (16) | |
| 1974-75 | UCLA (17) | |
| 1975-76 | UCLA (18) | |
| 1976-77 | UCLA (19) | |
| 1977-78 | UCLA (20) | |
| 1978-79 | UCLA (21) | |
| 1979-80 | Oregon State (8) | |
| 1980-81 | Oregon State (9) | |
| 1981-82 | Oregon State (10) | |
| 1982-83 | UCLA (22) | |
| 1983-84 | Oregon State (11) Washington (8) | |
| 1984-85 | USC (7) Washington (9) | |
| 1985-86 | Arizona (1) | |
| 1986-87 | UCLA (23) | UCLA (1) |
| 1987-88 | Arizona (2) | Arizona (1) |
| 1988-89 | Arizona (3) | Arizona (2) |
| 1989-90 | Arizona (4) Oregon State (12) | Arizona (3) |
| 1990-91 | Arizona (5) | |
| 1991-92 | UCLA (24) | |
| 1992-93 | Arizona (6) | |
| 1993-94 | Arizona (7) | |
| 1994-95 | UCLA (25) | |
| 1995-96 | UCLA (26) | |
| 1996-97 | UCLA (27) | |
| 1997-98 | Arizona (8) | |
| 1998-99 | Stanford (8) | |
| 1999-00 | Arizona (9) Stanford (9) | |
| 2000-01 | Stanford (10) | |
| 2001-02 | Oregon (4) | Arizona (4) |
| 2002-03 | Arizona (10) | Oregon (1) |
| 2003-04 | Stanford (11) | Stanford (1) |
| 2004-05 | Arizona (11) | Washington (1) |
| 2005-06 | UCLA (28) | UCLA (2) |
| 2006-07 | UCLA (29) | Oregon (2) |
| 2007-08 | UCLA (30) | UCLA (3) |
| Conf | Ovrl | ||||||
|---|---|---|---|---|---|---|---|
| Year | Team | W | L | Pct | W | L | Pct |
| 1986-87 | USC | 15 | 3 | 0.833 | 22 | 8 | 0.733 |
| 1987-88 | Washington | 16 | 2 | 0.889 | 25 | 5 | 0.833 |
| 1988-89 | Stanford | 18 | 0 | 1.000 | 28 | 3 | 0.903 |
| 1989-90 | Stanford | 17 | 1 | 0.944 | 32 | 1 | 0.970 |
| Washington | 17 | 1 | 0.944 | 28 | 3 | 0.903 | |
| 1990-91 | Stanford | 16 | 2 | 0.889 | 26 | 6 | 0.813 |
| 1991-92 | Stanford | 15 | 3 | 0.833 | 30 | 3 | 0.909 |
| 1992-93 | Stanford | 15 | 3 | 0.833 | 26 | 6 | 0.812 |
| 1993-94 | USC | 16 | 2 | 0.887 | 26 | 4 | 0.867 |
| 1994-95 | Stanford | 17 | 1 | 0.944 | 30 | 3 | 0.909 |
| 1995-96 | Stanford | 18 | 0 | 1.000 | 29 | 3 | 0.906 |
| 1996-97 | Stanford | 18 | 0 | 1.000 | 34 | 2 | 0.944 |
| 1997-98 | Stanford | 17 | 1 | 0.944 | 21 | 6 | 0.778 |
| 1998-99 | Oregon | 15 | 3 | 0.833 | 25 | 6 | 0.806 |
| UCLA | 15 | 3 | 0.833 | 26 | 8 | 0.765 | |
| 1999-00 | Oregon | 14 | 4 | 0.778 | 23 | 8 | 0.742 |
| 2000-01 | Arizona State | 12 | 6 | 0.667 | 20 | 11 | 0.645 |
| Stanford | 12 | 6 | 0.667 | 19 | 11 | 0.633 | |
| Washington | 12 | 6 | 0.667 | 22 | 10 | 0.688 | |
| 2001-02 | Stanford | 18 | 0 | 1.000 | 32 | 3 | 0.914 |
| 2002-03 | Stanford | 15 | 3 | 0.833 | 27 | 5 | 0.844 |
| 2003-04 | Arizona | 14 | 4 | 0.778 | 24 | 9 | 0.727 |
| Stanford | 14 | 4 | 0.778 | 27 | 7 | 0.813 | |
| 2004-05 | Stanford | 17 | 1 | 0.944 | 32 | 3 | 0.914 |
| 2005-06 | Stanford | 15 | 3 | 0.833 | 26 | 8 | 0.765 |
| 2006-07 | Stanford | 17 | 1 | 0.944 | 28 | 4 | 0.875 |
| Conf | Ovrl | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Year | Conference Champion (#) | W | L | T | Pts | Opp | W | L | T |
| 1916 | Washington (1) | 3 | 0 | 1 | 62 | 10 | 6 | 0 | 1 |
| 1917 | Washington State (1) | 3 | 0 | 0 | 46 | 3 | 6 | 0 | 0 |
| 1918 | California (1) | 2 | 0 | 0 | 72 | 0 | 7 | 2 | 0 |
| 1919 | *Oregon (1) | 2 | 1 | 0 | 33 | 20 | 5 | 1 | 3 |
| Washington (2) | 2 | 1 | 0 | 33 | 31 | 5 | 1 | 0 | |
| 1920 | California (2) | 3 | 0 | 0 | 104 | 7 | 9 | 0 | 0 |
| 1921 | California (3) | 4 | 0 | 0 | 167 | 10 | 9 | 0 | 1 |
| 1922 | California (4) | 4 | 0 | 0 | 146 | 7 | 9 | 0 | 0 |
| 1923 | California (5) | 5 | 0 | 0 | 66 | 7 | 9 | 0 | 1 |
| 1924 | Stanford (1) | 3 | 0 | 1 | 92 | 36 | 7 | 1 | 1 |
| 1925 | Washington (3) | 5 | 0 | 0 | 88 | 24 | 10 | 1 | 1 |
| 1926 | Stanford (2) | 4 | 0 | 0 | 112 | 40 | 10 | 0 | 1 |
| 1927 | *Stanford (3) | 4 | 0 | 1 | 78 | 32 | 8 | 2 | 1 |
| USC (1) | 4 | 0 | 1 | 99 | 38 | 8 | 1 | 1 | |
| 1928 | USC (2) | 4 | 0 | 1 | 84 | 20 | 9 | 0 | 1 |
| 1929 | USC (3) | 6 | 1 | 0 | 258 | 29 | 10 | 2 | 0 |
| 1930 | Washington State (2) | 6 | 0 | 0 | 134 | 20 | 9 | 1 | 0 |
| 1931 | USC (4) | 7 | 0 | 0 | 259 | 13 | 10 | 1 | 0 |
| 1932 | USC (5) | 6 | 0 | 0 | 112 | 13 | 10 | 0 | 0 |
| 1933 | Oregon (2) | 4 | 1 | 0 | 45 | 29 | 9 | 1 | 0 |
| *Stanford (4) | 4 | 1 | 0 | 56 | 23 | 8 | 2 | 1 | |
| 1934 | Stanford (5) | 5 | 0 | 0 | 93 | 7 | 9 | 1 | 1 |
| 1935 | California (6) | 4 | 1 | 0 | 55 | 22 | 9 | 1 | 0 |
| *Stanford (6) | 4 | 1 | 0 | 60 | 7 | 8 | 1 | 0 | |
| UCLA (1) | 4 | 1 | 0 | 75 | 39 | 8 | 2 | 0 | |
| 1936 | Washington (4) | 7 | 0 | 1 | 141 | 21 | 7 | 2 | 1 |
| 1937 | California (7) | 6 | 0 | 1 | 137 | 26 | 10 | 0 | 1 |
| 1938 | California (8) | 6 | 1 | 0 | 107 | 37 | 10 | 1 | 0 |
| *USC (6) | 6 | 1 | 0 | 131 | 36 | 9 | 2 | 0 | |
| 1939 | USC (7) | 5 | 0 | 2 | 121 | 21 | 8 | 0 | 2 |
| 1940 | Stanford (7) | 7 | 0 | 0 | 141 | 66 | 10 | 0 | 0 |
| 1941 | Oregon State (1) | 7 | 2 | 0 | 123 | 33 | 8 | 2 | 0 |
| 1942 | UCLA (2) | 6 | 1 | 0 | 146 | 58 | 7 | 4 | 0 |
| 1943 | USC (8) | 5 | 0 | 0 | 95 | 13 | 8 | 2 | 0 |
| 1944 | USC (9) | 3 | 0 | 2 | 129 | 39 | 8 | 0 | 2 |
| 1945 | USC (10) | 5 | 1 | 0 | 107 | 43 | 7 | 4 | 0 |
| 1946 | UCLA (3) | 7 | 0 | 0 | 216 | 45 | 10 | 1 | 0 |
| 1947 | USC (11) | 6 | 0 | 0 | 147 | 20 | 7 | 2 | 1 |
| 1948 | *California (9) | 6 | 0 | 0 | 155 | 40 | 10 | 1 | 0 |
| Oregon (3) | 7 | 0 | 0 | 125 | 48 | 9 | 2 | 0 | |
| 1949 | California (10) | 7 | 0 | 0 | 220 | 80 | 10 | 1 | 0 |
| 1950 | California (11) | 5 | 0 | 1 | 124 | 28 | 9 | 1 | 1 |
| 1951 | Stanford (8) | 6 | 1 | 0 | 152 | 101 | 9 | 2 | 0 |
| 1952 | USC (12) | 6 | 0 | 0 | 174 | 32 | 10 | 1 | 0 |
| 1953 | UCLA (4) | 6 | 1 | 0 | 172 | 41 | 8 | 2 | 0 |
| 1954 | UCLA (5) | 6 | 0 | 0 | 256 | 26 | 9 | 0 | 0 |
| 1955 | UCLA (6) | 6 | 0 | 0 | 197 | 37 | 9 | 2 | 0 |
| 1956 | Oregon State (2) | 6 | 1 | 1 | 152 | 104 | 7 | 3 | 1 |
| 1957 | *Oregon (4) | 6 | 2 | 0 | 124 | 81 | 7 | 4 | 0 |
| Oregon State (3) | 6 | 2 | 0 | 147 | 110 | 8 | 2 | 0 | |
| 1958 | California (12) | 6 | 1 | 0 | 127 | 85 | 7 | 4 | 0 |
| 1959 | UCLA (7) | 3 | 1 | 0 | 91 | 51 | 5 | 4 | 1 |
| USC (13) | 3 | 1 | 0 | 69 | 60 | 8 | 2 | 0 | |
| *Washington (5) | 3 | 1 | 0 | 68 | 29 | 10 | 1 | 0 | |
| 1960 | Washington (6) | 4 | 0 | 0 | 100 | 25 | 10 | 1 | 0 |
| 1961 | UCLA (8) | 3 | 1 | 0 | 78 | 39 | 7 | 4 | 0 |
| 1962 | USC (14) | 4 | 0 | 0 | 99 | 23 | 11 | 0 | 0 |
| 1963 | Washington (7) | 4 | 1 | 0 | 96 | 58 | 6 | 5 | 0 |
| 1964 | *Oregon State (4) | 3 | 1 | 0 | 74 | 36 | 8 | 3 | 0 |
| USC (15) | 3 | 1 | 0 | 88 | 58 | 7 | 3 | 0 | |
| 1965 | UCLA (9) | 4 | 0 | 0 | 134 | 56 | 8 | 2 | 1 |
| 1966 | USC (16) | 4 | 1 | 0 | 101 | 44 | 7 | 4 | 0 |
| 1967 | USC (17) | 6 | 1 | 0 | 182 | 47 | 10 | 1 | 0 |
| 1968 | USC (18) | 6 | 0 | 0 | 114 | 90 | 9 | 1 | 1 |
| 1969 | USC (19) | 6 | 0 | 0 | 129 | 66 | 10 | 0 | 1 |
| 1970 | Stanford (9) | 6 | 1 | 0 | 220 | 101 | 9 | 3 | 0 |
| 1971 | Stanford (10) | 6 | 1 | 0 | 162 | 98 | 9 | 3 | 0 |
| 1972 | USC (20) | 7 | 0 | 0 | 243 | 59 | 12 | 0 | 0 |
| 1973 | USC (21) | 7 | 0 | 0 | 240 | 124 | 9 | 2 | 1 |
| 1974 | USC (22) | 6 | 0 | 1 | 226 | 69 | 10 | 1 | 1 |
| 1975 | California (13) | 6 | 1 | 0 | 235 | 132 | 8 | 3 | 0 |
| *UCLA (10) | 6 | 1 | 0 | 215 | 123 | 9 | 2 | 1 | |
| 1976 | USC (23) | 7 | 0 | 0 | 234 | 81 | 11 | 1 | 0 |
| 1977 | Washington (8) | 6 | 1 | 0 | 238 | 103 | 8 | 4 | 0 |
| 1978 | USC (24) | 6 | 1 | 0 | 182 | 81 | 12 | 1 | 0 |
| 1979 | USC (25) | 6 | 0 | 1 | 244 | 99 | 11 | 0 | 1 |
| 1980 | Washington (9) | 6 | 1 | 0 | 198 | 119 | 9 | 3 | 0 |
| 1981 | Washington (10) | 6 | 2 | 0 | 185 | 147 | 10 | 2 | 0 |
| 1982 | UCLA (11) | 5 | 1 | 1 | 218 | 148 | 10 | 1 | 1 |
| 1983 | UCLA (12) | 6 | 1 | 1 | 211 | 158 | 7 | 4 | 1 |
| 1984 | USC (26) | 7 | 1 | 0 | 148 | 107 | 9 | 3 | 0 |
| 1985 | UCLA (13) | 6 | 2 | 0 | 231 | 120 | 9 | 2 | 1 |
| 1986 | Arizona State (1) | 5 | 1 | 1 | 203 | 122 | 10 | 1 | 1 |
| 1987 | UCLA (14) | 7 | 1 | 0 | 309 | 123 | 10 | 2 | 0 |
| *USC (27) | 7 | 1 | 0 | 253 | 139 | 8 | 4 | 0 | |
| 1988 | USC (28) | 8 | 0 | 0 | 289 | 121 | 10 | 2 | 0 |
| 1989 | USC (29) | 6 | 0 | 1 | 174 | 67 | 9 | 2 | 1 |
| 1990 | Washington (11) | 7 | 1 | 0 | 340 | 99 | 10 | 2 | 0 |
| 1991 | Washington (12) | 8 | 0 | 0 | 321 | 77 | 12 | 0 | 0 |
| 1992 | Stanford (11) | 6 | 2 | 0 | 184 | 130 | 10 | 3 | 0 |
| *Washington (13) | 6 | 2 | 0 | 219 | 117 | 9 | 3 | 0 | |
| 1993 | Arizona (1) | 6 | 2 | 0 | 209 | 128 | 10 | 2 | 0 |
| *UCLA (15) | 6 | 2 | 0 | 217 | 168 | 8 | 4 | 0 | |
| USC (30) | 6 | 2 | 0 | 229 | 141 | 8 | 5 | 0 | |
| 1994 | Oregon (5) | 7 | 1 | 0 | 199 | 108 | 9 | 4 | 0 |
| 1995 | *USC (31) | 6 | 1 | 1 | 214 | 130 | 9 | 2 | 1 |
| Washington (14) | 6 | 1 | 1 | 232 | 170 | 7 | 4 | 1 | |
| 1996 | Arizona State (2) | 8 | 0 | 0 | 346 | 182 | 11 | 1 | 0 |
| 1997 | UCLA (16) | 7 | 1 | 0 | 292 | 181 | 10 | 2 | 0 |
| *Washington State (3) | 7 | 1 | 0 | 297 | 246 | 10 | 2 | 0 | |
| 1998 | UCLA (17) | 8 | 0 | 0 | 309 | 198 | 10 | 2 | 0 |
| 1999 | Stanford (12) | 7 | 1 | 0 | 313 | 197 | 8 | 4 | 0 |
| 2000 | Oregon (6) | 7 | 1 | 0 | 215 | 172 | 10 | 2 | 0 |
| Oregon State (5) | 7 | 1 | 0 | 275 | 161 | 11 | 1 | 0 | |
| *Washington (15) | 7 | 1 | 0 | 258 | 183 | 11 | 1 | 0 | |
| 2001 | Oregon (7) | 7 | 1 | 0 | 281 | 181 | 11 | 1 | 0 |
| 2002 | USC (32) | 7 | 1 | 0 | 299 | 163 | 11 | 1 | 0 |
| *Washington State (4) | 7 | 1 | 0 | 285 | 188 | 10 | 3 | 0 | |
| 2003 | USC (33) | 7 | 1 | 0 | 342 | 161 | 12 | 1 | 0 |
| 2004 | USC (34) | 8 | 0 | 0 | 285 | 117 | 13 | 0 | 0 |
| 2005 | USC (35) | 8 | 0 | 0 | 383 | 149 | 12 | 1 | 0 |
| 2006 | California (14) | 7 | 2 | 0 | 280 | 173 | 10 | 3 | 0 |
| *USC (36) | 7 | 2 | 0 | 242 | 131 | 11 | 2 | 0 | |
| 2007 | Arizona State (3) | 7 | 2 | 0 | 274 | 211 | 10 | 2 | 0 |
| *USC (37) | 7 | 2 | 0 | 250 | 150 | 10 | 2 | 0 | |
* Denotes Pac-10 representative in Rose Bowl
Co-champions vs Rose Bowl See page 137 of Pac-10 Handbook for explanation
Bold Denotes unofficial National Champion recognition
| Season | Conference | |||
|---|---|---|---|---|
| 1916 | CAL | |||
| 1917 | CAL | |||
| 1918 | ORE | |||
| 1919 | WASH | |||
| 1920 | CAL | |||
| 1921 | CAL | |||
| 1922 | WASH | |||
| Season | North | South | ||
| 1923 | WASH | CAL | ||
| Season | Conference | |||
| 1924 | CAL | |||
| Season | North | South | ||
| 1925 | WASH | STAN | ||
| 1926 | WASH | CAL | ||
| Season | North | CIBA | ||
| 1927 | WSU | STM | ||
| 1928 | ORE/WSU | STM | ||
| 1929 | WASH | CAL | ||
| 1930 | WASH | USC | ||
| 1931 | WASH | STAN | ||
| 1932 | WASH | USC | ||
| 1933 | WSU | CAL | ||
| 1934 | ORE | CAL | ||
| 1935 | ORE | CAL/USC | ||
| 1936 | WSU | USC | ||
| 1937 | ORE | CAL | ||
| 1938 | OSU/WSU | CAL | ||
| 1939 | ORE | USC/STM | ||
| 1940 | OSU | STM | ||
| 1941 | ORE | CAL/STM | ||
| 1942 | ORE | USC | ||
| 1943 | ORE | ****CAL/USC | ||
| 1944 | WSU | UCLA | ||
| 1945 | WSU | CAL | ||
| 1946 | ORE | USC | ||
| 1947 | WSU | CAL/USC | ||
| 1948 | WSU | USC*** | ||
| 1949 | WSU | USC*** | ||
| 1950 | WSU*** | STAN | ||
| 1951 | OSU | USC*** | ||
| 1952 | OSU*** | USC | ||
| 1953 | ORE | STAN*** | ||
| 1954 | ORE*** | USC | ||
| 1955 | ORE | USC*** | ||
| 1956 | WSU*** | USC | ||
| 1957 | ORE | CAL***/USC | ||
| 1958 | OSU | USC*** | ||
| 1959 | WASH | USC*** | ||
| Season | AAWU | |||
| 1960 | WSU | CAL/USC | ||
| 1961 | WSU | USC | ||
| 1962 | OSU | SC | ||
| 1963 | OSU | USC | ||
| 1964 | ORE | USC | ||
| 1965 | WSU | STAN | ||
| 1966 | WSU | USC | ||
| Season | Pac-8 | |||
| 1967 | STAN | |||
| 1968 | USC | |||
| 1969 | UCLA | |||
| Season | North | CIBA | ||
| 1970 | WSU | USC** | ||
| 1971 | WSU | USC** | ||
| 1972 | WSU/ORE | USC** | ||
| 1973 | WSU | USC** | ||
| 1974 | ORE/WSU | USC** | ||
| 1975 | WSU | USC** | ||
| 1976 | WSU** | UCLA | ||
| Season | North | South | ||
| 1977 | WSU | USC** | ||
| 1978 | WSU | USC** | ||
| 1979 | WSU | UCLA | ||
| 1980 | WSU | ARIZ/CAL | ||
| 1981 | WASH | ASU | ||
| 1982 | OSU/WSU | ASU | ||
| 1983 | OSU | STAN | ||
| 1984 | WSU/PSU | ASU | ||
| 1985 | WSU | STAN | ||
| 1986 | OSU | UCLA | ||
| 1987 | WSU | STAN | ||
| 1988 | WSU | ASU | ||
| 1989 | WSU | ARIZ | ||
| 1990 | WSU | STAN | ||
| 1991 | WSU | USC | ||
| 1992 | WASH | ARIZ | ||
| 1993 | WASH | ASU | ||
| 1994 | OSU | STAN | ||
| 1995 | WSU | USC* | ||
| 1996 | WASH | USC* | ||
| 1997 | WASH* | STAN | ||
| 1998 | WASH* | STAN | ||
| Season | Pac-10 | Record | ||
| 1999 | STAN | |||
| 2000 | ASU/STAN/UCLA | |||
| 2001 | USC | |||
| 2002 | USC | |||
| 2003 | STAN | |||
| 2004 | STAN | 46-14 (16-8) | ||
| 2005 | OSU | 46-12 (19-5) | ||
| 2006 | OSU | 50-16 (16-7) | ||
| 2007 | ASU | |||
| 2008 | ASU | 49-13 (16-8) | ||
Note: Oregon dropped its baseball program following the 1981 season and will reinstate it in 2009
*denotes North-South playoff champion
**denotes Pac-8 playoff champion
***denotes Pacific Coast Conference playoff champion
****California won the CIBA Division 1 and USC won Division
2. Cal defeated USC in a playfoff for the CIBA title.
LEGEND: PSU = Portland State, SC = Santa Clara
Bold text indicates National Champion
| Conf | Ovrl | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Year | Team | W | L | T | Pct | W | L | T | Pct |
| 1987 | California | 8 | 2 | 0 | 0.800 | 34 | 15 | 0 | 0.694 |
| 1988 | UCLA | 15 | 3 | 0 | 0.833 | 53 | 8 | 0 | 0.869 |
| 1989 | UCLA | 18 | 2 | 0 | 0.900 | 48 | 4 | 0 | 0.923 |
| 1990 | UCLA | 16 | 2 | 0 | 0.889 | 62 | 7 | 0 | 0.899 |
| 1991 | UCLA | 16 | 4 | 0 | 0.800 | 50 | 5 | 0 | 0.909 |
| 1992 | Arizona | 16 | 2 | 0 | 0.889 | 58 | 7 | 0 | 0.892 |
| 1993 | UCLA | 25 | 1 | 0 | 0.962 | 50 | 5 | 0 | 0.909 |
| 1994 | Arizona | 23 | 1 | 0 | 0.958 | 64 | 3 | 0 | 0.955 |
| 1995 | Arizona | 24 | 4 | 0 | 0.857 | 66 | 6 | 0 | 0.917 |
| 1996 | Washington | 23 | 4 | 0 | 0.852 | 59 | 9 | 0 | 0.868 |
| 1997 | Arizona | 26 | 1 | 0 | 0.963 | 61 | 5 | 0 | 0.924 |
| 1998 | Arizona | 27 | 1 | 0 | 0.964 | 67 | 4 | 0 | 0.944 |
| 1999 | UCLA | 22 | 6 | 0 | 0.786 | 63 | 6 | 0 | 0.913 |
| 2000 | Washington | 17 | 4 | 0 | 0.810 | 62 | 9 | 0 | 0.873 |
| 2001 | Arizona | 19 | 2 | 0 | 0.905 | 65 | 4 | 0 | 0.942 |
| 2002 | UCLA | 18 | 3 | 0 | 0.857 | 55 | 9 | 0 | 0.859 |
| 2003 | Arizona | 19 | 2 | 0 | 0.905 | 54 | 5 | 0 | 0.915 |
| 2004 | Arizona | 17 | 3 | 0 | 0.850 | 55 | 6 | 0 | 0.902 |
| 2005 | California Arizona Oregon State Stanford | 13 13 13 13 | 8 8 8 8 | 0 0 0 0 | 0.619 0.619 0.619 0.619 | 52 45 43 43 | 15 12 16 16 | 0 0 0 0 | 0.776 0.789 0.729 0.729 |
| 2006 | Arizona | 15 | 5 | 1 | 0.738 | 44 | 12 | 1 | 0.781 |
| 2007 | Arizona | 15 | 5 | 1 | 0.738 | 50 | 14 | 1 | 0.777 |
| 2008 | Arizona State | 18 | 3 | 0 | .857 | 64 | 5 | 0 | .927 |
| Conf | Ovrl | Conf | Ovrl | |||
|---|---|---|---|---|---|---|
| Season | Champion | W-L-T | W-L-T | Runner-Up | W-L-T | W-L-T |
| 2000 | Washington | |||||
| 2001 | Stanford | |||||
| 2002 | UCLA | 8-2-0 | 16-3-3 | California | 6-3-1 | 14-6-2 |
| 2003 | UCLA | 10-0-0 | 20-2-1 | Oregon State | 7-3-0 | 13-7-0 |
| 2004 | UCLA | 6-2-0 | 14-4-2 | California | 4-3-1 | 13-4-3 |
| 2005 | UCLA | 7-1-2 | 12-5-3 | California | 6-3-1 | 14-4-3 |
| 2006 | California | 7-3-0 | 12-5-1 | San Diego State | 5-2-3 | 9-5-4 |
| 2007 | California | 6-3-1 | 11-5-2 | San Diego State Stanford UCLA | 4-4-2 | 8-7-4 7-6-5 8-8-3 |
| 2008 |
| Conf | Ovrl | Conf | Ovrl | |||
|---|---|---|---|---|---|---|
| Season | Champion | W-L-T | W-L-T | Runner-Up | W-L-T | W-L-T |
| 1995 | Stanford | |||||
| 1996 | Stanford | |||||
| 1997 | UCLA | |||||
| 1998 | California UCLA USC | |||||
| 1999 | Stanford | |||||
| 2000 | Washington | |||||
| 2001 | UCLA | |||||
| 2002 | Stanford | |||||
| 2003 | UCLA | 8-0-1 | 20-2-3 | Arizona State | 6-2-1 | 13-5-3 |
| 2004 | UCLA Arizona | 6-3-0 6-3-0 | 17-6-0 15-6-0 | Washington | 5-3-1 | 17-5-1 |
| 2005 | UCLA | 7-0-2 | 22-2-2 | California | 7-1-1 | 16-4-2 |
| 2006 | UCLA | 8-1-0 | 17-3-0 | Oregon | 6-1-2 | 12-6-2 |
| 2007 | UCLA | 9-0-0 | 18-1-2 | USC | 6-2-1 | 16-3-2 |
| 2007 | UCLA | 9-0-0 | 18-1-2 | USC | 6-2-1 | 16-3-2 |
| 2008 |