| Years | Conferences | Win–Loss | Pct. |
|---|---|---|---|
| 1919–1920 | None | — | — |
| 1920–1927 | Southern California Intercollegiate Athletic Conference (SCIAC) | 63–6 | .913 |
| 1927–1959 | Pacific Coast Conference (PCC) | ||
| 1959–1968 | Athletic Association of Western Universities (AAWU) | 99–21 | .825 |
| 1968–1978 | Pacific-8 Conference | 129–11 | .921 |
| 1978–2011 | Pacific-10 Conference | 365–166 | .687 |
| 2011–present | Pacific-12 Conference |
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