Editing Pac-12 Conference (section)

===Membership timeline===

The Pac-12 claims the PCC's history as its own. Not only did it maintain the automatic bid from the Rose Bowl inherited from the PCC, but the eight largest schools in the old PCC all eventually joined the new league. However, the old PCC operated under a separate charter.

The Pac-12 is one of the founding members of the [[Mountain Pacific Sports Federation]] (MPSF), a conference organized to provide competition in non-revenue Olympic sports. All-Pac-12 members participate in at least one MPSF sport (men's and women's indoor track and field both actually have enough participating Pac-12 schools for the conference to sponsor a championship, but the Pac-12 has opted not to do so). For certain sports, the Pac-12 admits certain schools as associate members.

<timeline>

DateFormat  = mm/dd/yyyy

ImageSize   = width:1100 height:auto barincrement:20

Period      = from:12/02/1915 till:06/30/2045

TimeAxis    = orientation:horizontal

PlotArea    = right:5 left:5 bottom:50 top:5 #> to display a count on left side of graph,  use "left:20" to suppress the count, use "left:20"<#

Colors =  id:barcolor value:rgb(0.99,0.7,0.7)

          id:line     value:black

          id:bg       value:white
          id:Full value:rgb(0.742,0.727,0.852) # Use this color to denote a team that is a member in all sports
          id:FullxF value:rgb(0.551,0.824,0.777) # Use this color to denote a team that is a member in all sports except for football
          id:AssocF value:rgb(0.98,0.5,0.445) # Use this color to denote a team that is a member for football only
          id:AssocOS value:rgb(0.5,0.691,0.824) # Use this color to denote a team that is a member in some sports, but not all (consider identifying in legend or a footnote)
          id:OtherC1 value:rgb(0.996,0.996,0.699) # Use this color to denote a team that has moved to another conference
          id:OtherC2 value:rgb(0.988,0.703,0.383) # Use this color to denote a team that has moved to another conference where OtherC1 has already been used, to distinguish the two
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   bar:1 color:Full from:12/02/1915 till:end text:[[University of California, Berkeley|California]] (1915–2024)
   bar:1 color:OtherC1 from:08/02/2024 till:end text:[[Atlantic Coast Conference|ACC]]

   bar:2 color:Full from:12/02/1915 till:08/02/2024 text:[[University of Washington|Washington]] (1915–2024)
   bar:2 color:OtherC1 from:08/02/2024 till:end text:[[Big Ten Conference|Big Ten]]

   bar:3 color:Full from:12/02/1915 till:06/30/1959 text:[[University of Oregon|Oregon]] (1915–1959, 1964–2024)
   bar:3 color:Ind from:07/01/1959 till:06/30/1964 text:Indep.
   bar:3 color:Full from:07/01/1964 till:08/02/2024
   bar:3 color:OtherC1 from:08/02/2024 till:end text:[[Big Ten Conference|Big Ten]]

   bar:4 color:Full from:12/02/1915 till:06/30/1959 text:[[Oregon State]] (1915–1959, 1964–present)
   bar:4 color:Ind from:07/01/1959 till:06/30/1964 text:Indep.
   bar:4 color:Full from:07/01/1964 till:end

   bar:5 color:Ind from:12/02/1915 till:06/30/1917 text:Ind.
   bar:5 shift:(10) color:Full from:07/01/1917 till:06/30/1959 text:[[Washington State University|Washington State]] (1917–1959, 1962–present)
   bar:5 color:Ind from:07/01/1959 till:06/30/1962 text:Indep.
   bar:5 color:Full from:07/01/1962 till:end

   bar:6 color:Ind from:12/02/1915 till:06/30/1918 text:Ind.
   bar:6 color:Full from:07/01/1918 till:end text:[[Stanford University|Stanford]] (1918–2024)
   bar:6 color:OtherC1 from:08/02/2024 till:end text:[[Atlantic Coast Conference|ACC]]

   bar:7 color:Ind from:12/02/1915 till:06/30/1922 text:Indep.
   bar:7 color:Full from:07/01/1922 till:08/02/2024 text:[[University of Southern California|USC]] (1922–2024)
   bar:7 color:OtherC1 from:08/02/2024 till:end text:[[Big Ten Conference|Big Ten]]

   bar:8 color:Ind from:12/02/1915 till:06/30/1922 text:Indep.
   bar:8 color:Full from:07/01/1922 till:06/30/1959 text:[[University of Idaho|Idaho]] (1922–1959)
   bar:8 color:Ind from:07/01/1959 till:06/30/1963 text:Indep.
   bar:8 color:OtherC2 from:07/01/1963 till:06/30/1996 text:[[Big Sky Conference|Big Sky]]
   bar:8 color:OtherC1 from:07/01/1996 till:06/30/2005 text:[[Big West Conference|Big West]]
   bar:8 color:OtherC2 from:07/01/2005 till:06/30/2014 text:[[Western Athletic Conference|WAC]]
   bar:8 color:OtherC1 from:07/01/2014 till:end text:[[Big Sky Conference|Big Sky]]

   bar:9 color:Ind from:12/02/1915 till:06/30/1924 text:Independent
   bar:9 color:Full from:07/01/1924 till:06/30/1950 text:[[University of Montana|Montana]] (1924–1950)
   bar:9 shift:(-6) color:Ind from:07/01/1950 till:06/30/1951 text:Ind.
   bar:9 color:OtherC1 from:07/01/1951 till:06/30/1962 text:[[Skyline Conference (1938–1962)|Skyline]]
   bar:9 shift:(-6) color:Ind from:07/01/1962 till:06/30/1963 text:Ind.
   bar:9 color:OtherC1 from:07/01/1963 till:end text:[[Big Sky Conference|Big Sky]]

   bar:10 color:Ind from:12/02/1915 till:06/30/1919 text:Indep.
   bar:10 color:OtherC1 from:07/01/1919 till:06/30/1928 text:[[Southern California Intercollegiate Athletic Conference|SCIAC]]
   bar:10 color:Full from:07/01/1928 till:08/02/2024 text:[[University of California, Los Angeles|UCLA]] (1928–2024)
   bar:10 color:OtherC1 from:08/02/2024 till:end text:[[Big Ten Conference|Big Ten]]

   bar:11 color:Ind from:12/02/1915 till:06/30/1931 text:Independent
   bar:11 color:OtherC1 from:07/01/1931 till:06/30/1962 text:[[Border Conference|Border]]
   bar:11 color:OtherC2 from:07/01/1962 till:06/30/1978 text:[[Western Athletic Conference|WAC]]
   bar:11 color:Full from:07/01/1978 till:06/30/2024 text:[[University of Arizona|Arizona]] (1978–2024)
   bar:11 color:OtherC1 from:07/01/2024 till:end text:[[Big 12 Conference|Big 12]]

   bar:12 color:Ind from:12/02/1915 till:06/30/1931 text:Independent
   bar:12 color:OtherC1 from:07/01/1931 till:06/30/1962 text:[[Border Conference|Border]]
   bar:12 color:OtherC2 from:07/01/1962 till:06/30/1978 text:[[Western Athletic Conference|WAC]]
   bar:12 color:Full from:07/01/1978 till:06/30/2024 text:[[Arizona State University|Arizona State]] (1978–2024)
   bar:12 color:OtherC1 from:07/01/2024 till:end text:[[Big 12 Conference|Big 12]]

   bar:13 color:OtherC1 from:12/02/1915 till:06/30/1937 text:[[Rocky Mountain Faculty Athletic Conference|Rocky Mountain]]
   bar:13 color:OtherC2 from:07/01/1937 till:06/30/1947 text:[[Skyline Conference (1938–1962)|Skyline]]
   bar:13 color:OtherC1 from:07/01/1947 till:06/30/1996 text:[[Big Eight Conference|Big Eight]]
   bar:13 color:OtherC2 from:07/01/1996 till:06/30/2011 text:[[Big 12 Conference|Big 12]]
   bar:13 color:Full from:07/01/2011 till:06/30/2024 text:[[University of Colorado at Boulder|Colorado]] (2011–2024)
   bar:13 color:OtherC1 from:07/01/2024 till:end text:[[Big 12 Conference|Big 12]]

   bar:14 color:OtherC1 from:12/02/1915 till:06/30/1937 text:[[Rocky Mountain Faculty Athletic Conference|Rocky Mountain]]
   bar:14 color:OtherC2 from:07/01/1937 till:06/30/1962 text:[[Skyline Conference (1938–1962)|Skyline]]
   bar:14 color:OtherC1 from:07/01/1962 till:06/30/1999 text:[[Western Athletic Conference|WAC]]
   bar:14 color:OtherC2 from:07/01/1999 till:06/30/2011 text:[[Mountain West Conference|Mountain West]]
   bar:14 color:Full from:07/01/2011 till:06/30/2024 text:[[University of Utah|Utah]] (2011–2024)
   bar:14 color:OtherC1 from:07/01/2024 till:end text:[[Big 12 Conference|Big 12]]

   bar:15 color:Ind from:07/01/1933 till:06/30/1948 text:Independent
   bar:15 color:OtherC1 from:07/01/1948 till:06/30/1968 text:[[Intermountain Collegiate Athletic Conference|ICAC]]
   bar:15 shift:(-3) color:Ind from:07/01/1968 till:06/30/1970 text:[[NAIA Independent Schools|Ind.]]
   bar:15 color:OtherC1 from:07/01/1970 till:06/30/1987 text:[[Big Sky Conference|Big Sky]]
   bar:15 color:AssocOS from:07/01/1987 till:06/30/2017 text:(wrestling, 1987–2017)
   bar:15 shift:(3) color:OtherC1 from:07/01/2017 till:06/30/2026 text:[[Mountain West Conference|Mountain West]]
   bar:15 color:Full from:07/01/2026 till:end text:[[Boise State University|Boise State]] (2026–future)

   bar:16 color:OtherC1 from:12/02/1915 till:06/30/1937 text:[[Rocky Mountain Faculty Athletic Conference|Rocky Mountain]]
   bar:16 color:OtherC2 from:07/01/1937 till:06/30/1962 text:[[Skyline Conference (1938–1962)|Skyline]]
   bar:16 color:Ind from:07/01/1962 till:06/30/1968 text:Indep.
   bar:16 color:OtherC2 from:07/01/1968 till:06/30/1999 text:[[Western Athletic Conference|WAC]]
   bar:16 color:OtherC1 from:07/01/1999 till:06/30/2026 text:[[Mountain West Conference|Mountain West]]
   bar:16 color:Full from:07/01/2026 till:end text:[[Colorado State University|Colorado State]] (2026–future)

   bar:17 shift:(-5) color:Ind from:07/01/1921 till:06/30/1922 text:Ind.
   bar:17 color:OtherC2 from:07/01/1922 till:06/30/1925 text:[[Northern California Junior College Conference|CCC]]
   bar:17 color:OtherC1 from:07/01/1925 till:06/30/1941 text:[[Northern California Athletic Conference|Far Western]]
   bar:17 color:OtherC2 from:07/01/1941 till:06/30/1951 text:[[California Collegiate Athletic Association|CCAA]]
   bar:17 shift:(0) color:Ind from:07/01/1951 till:06/30/1953 text:Ind.
   bar:17 color:OtherC2 from:07/01/1953 till:06/30/1969 text:[[California Collegiate Athletic Association|CCAA]]
   bar:17 color:OtherC1 from:07/01/1969 till:06/30/1986 text:[[Big West Conference|PCAA]]
   bar:17 shift:(-55) color:AssocOS from:07/01/1986 till:06/30/1991 text:(wrestling, 1986–91)
   bar:17 shift:(2) color:OtherC1 from:07/01/1991 till:06/30/1992 text:[[Big West Conference|Big West]]
   bar:17 shift:(40) color:OtherC2 from:07/01/1992 till:06/30/2012 text:[[Western Athletic Conference|WAC]]
   bar:17 color:OtherC1 from:07/01/2012 till:06/30/2026 text:[[Mountain West Conference|Mountain West]]
   bar:17 color:Full from:07/01/2026 till:end text:[[California State University, Fresno|Fresno State]] (2026–future)

   bar:18 color:Ind from:12/02/1915 till:06/30/1947 text:Independent
   bar:18 color:OtherC2 from:07/01/1947 till:06/30/1958 text:[[NAIA independent schools|NAIA Ind.]]
   bar:18 color:Ind from:07/01/1958 till:06/30/1963 text:Indep.
   bar:18 color:OtherC2 from:07/01/1963 till:06/30/1979 text:[[Big Sky Conference|Big Sky]]
   bar:18 color:OtherC1 from:07/01/1979 till:06/30/2026 text:[[West Coast Conference|WCC]]
   bar:18 color:FullxF from:07/01/2026 till:end text:[[Gonzaga University|Gonzaga]] (2026–future)

   bar:19 shift:(-3)  color:OtherC1 from:07/01/1921 till:06/30/1925 text:[[Southern California Junior College Conference|SCJCC]]
   bar:19 shift:(-1) color:Ind from:07/01/1925 till:06/30/1926 text:Ind.
   bar:19 shift:(10) color:OtherC1 from:07/01/1926 till:06/30/1939 text:[[Southern California Intercollegiate Athletic Conference|SCIAC]]
   bar:19 color:OtherC2 from:07/01/1939 till:06/30/1968 text:[[California Collegiate Athletic Association|CCAA]]
   bar:19 shift:(-10) color:Ind from:07/01/1968 till:06/30/1969 text:Ind.
   bar:19 color:OtherC1 from:07/01/1969 till:06/30/1976 text:[[Big West Conference|PCAA]]
   bar:19 shift:(-1) color:Ind from:07/01/1976 till:06/30/1978 text:Ind.
   bar:19 color:OtherC1 from:07/01/1978 till:06/30/1999 text:[[Western Athletic Conference|WAC]]
   bar:19 shift:(-20) color:OtherC2 from:07/01/1999 till:06/30/2026 text:[[Mountain West Conference|Mountain West]]
   bar:19 color:AssocOS from:07/01/2005 till:06/30/2024 text:(m soc, 2005–24; w lax 2023–24)
   bar:19 color:Full from:07/01/2026 till:end text:[[San Diego State University|San Diego State]] (2026–future)

   bar:20 color:OtherC1 from:12/02/1915 till:06/30/1937 text:[[Rocky Mountain Faculty Athletic Conference|Rocky Mountain]]
   bar:20 color:OtherC2 from:07/01/1937 till:06/30/1962 text:[[Skyline Conference (1938–1962)|Skyline]]
   bar:20 color:Ind from:07/01/1962 till:06/30/1978 text:Independent
   bar:20 color:OtherC2 from:07/01/1978 till:06/30/1986 text:[[Big West Conference|PCAA]]
   bar:20 shift:(-25) color:AssocOS from:07/01/1986 till:06/30/1989 text:(wrestling, 1986–89)
   bar:20 shift:(50) color:OtherC2 from:07/01/1989 till:06/30/2005 text:[[Big West Conference|Big West]]
   bar:20 color:OtherC1 from:07/01/2005 till:06/30/2013 text:[[Western Athletic Conference|WAC]]
   bar:20 color:OtherC2 from:07/01/2013 till:06/30/2026 text:[[Mountain West Conference|Mountain West]]
   bar:20 color:Full from:07/01/2026 till:end text:[[Utah State University|Utah State]] (2026–future)

   bar:N  color:Bar1 from:12/02/1915 till:06/30/1959 text:Pacific Coast Conference
   bar:N  color:Bar2 from:07/01/1959 till:06/30/1968 text:AAWU
   bar:N  color:Bar1 from:07/01/1968 till:06/30/1978 text:Pacific-8
   bar:N  color:Bar2 from:07/01/1978 till:06/30/2011 text:Pacific-10
   bar:N  color:Bar1 from:07/01/2011 till:end text:Pac-12

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TextData =
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    textcolor:black
    pos:(0,30) tabs:(400-center)
    text:^"Pac-12 (PCC, AAWU, Pac-8/10) membership history"
# > If the chart uses more than one bar color, add a legend by selecting the appropriate fields from the following six options (use only the colors that are used in the graphic.) Leave a blank line after the end of the timeline, then add a line with the selected values from the list, separated by a space. {{Font color||{{RGB|190|186|218}}|Full members}} {{Font color||{{RGB|141|211|199}}|Full members (non-football)}} {{Font  color||{{RGB|251|128|114}}|Assoc. members (football only)}} {{Font color||{{RGB|128|177|211}}|Assoc. member (list sports)}} {{Font color||{{RGB|255|255|179}}|Other  Conference}} {{Font color||{{RGB|253|180|98}}|Other  Conference}} <#
</timeline>

{{Font color||{{RGB|190|186|218}}|&nbsp;Full members&nbsp;}} {{Font color||{{RGB|140|210|198}}|Full members (non-football)}} {{Font color||{{RGB|217|217|217}}|Independent&nbsp;}} {{Font color||{{RGB|255|255|179}}|Other Conference&nbsp;}} {{Font color||{{RGB|253|180|98}}|Other Conference&nbsp;}} {{Font color||{{RGB|128|177|211}}|Associate members (non-football)}}