Record*: 63-53, .543 W-L% (6th of 12) (Schedule and Results)
*W-L-T adjusted to 61-53 by NCAA.
SRS: 9.17 (1st of 12) ▪ SOS: 7.36 (1st of 12)
Conference Champion: Southern California
Ranked in Preseason AP Poll: 3 (California, Oregon and Southern California)
Ranked in Final AP Poll: 3 (Arizona State, California and Southern California)
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
|---|---|---|---|---|---|---|---|---|
| 1 | Sep 18, 2004 | Sat | UCLA | 37 | @ | Washington | 31 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 2 | Sep 25, 2004 | Sat | (22) Arizona State | 27 | Oregon State | 14 | ||
| 3 | Sep 25, 2004 | Sat | (1) Southern California | 31 | @ | Stanford | 28 | |
| 4 | Sep 25, 2004 | Sat | Washington State | 20 | @ | Arizona | 19 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 5 | Oct 2, 2004 | Sat | (21) Arizona State | 28 | @ | Oregon | 13 | |
| 6 | Oct 2, 2004 | Sat | (10) California | 49 | @ | Oregon State | 7 | |
| 7 | Oct 2, 2004 | Sat | Stanford | 27 | Washington | 13 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 8 | Oct 9, 2004 | Sat | Oregon | 41 | @ | Washington State | 38 | |
| 9 | Oct 9, 2004 | Sat | (1) Southern California | 23 | (7) California | 17 | ||
| 10 | Oct 9, 2004 | Sat | UCLA | 37 | Arizona | 17 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 11 | Oct 16, 2004 | Sat | (8) California | 45 | UCLA | 28 | ||
| 12 | Oct 16, 2004 | Sat | Oregon | 28 | Arizona | 14 | ||
| 13 | Oct 16, 2004 | Sat | Oregon State | 29 | @ | Washington | 14 | |
| 14 | Oct 16, 2004 | Sat | (1) Southern California | 45 | (15) Arizona State | 7 | ||
| 15 | Oct 16, 2004 | Sat | Stanford | 23 | @ | Washington State | 17 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 16 | Oct 23, 2004 | Sat | (21) Arizona State | 48 | UCLA | 42 | ||
| 17 | Oct 23, 2004 | Sat | (7) California | 38 | @ | Arizona | 0 | |
| 18 | Oct 23, 2004 | Sat | Oregon | 16 | @ | Stanford | 13 | |
| 19 | Oct 23, 2004 | Sat | Oregon State | 38 | Washington State | 19 | ||
| 20 | Oct 23, 2004 | Sat | (1) Southern California | 38 | Washington | 0 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 21 | Oct 30, 2004 | Sat | (7) California | 27 | (20) Arizona State | 0 | ||
| 22 | Oct 30, 2004 | Sat | Oregon | 31 | Washington | 6 | ||
| 23 | Oct 30, 2004 | Sat | Oregon State | 28 | @ | Arizona | 14 | |
| 24 | Oct 30, 2004 | Sat | (1) Southern California | 42 | @ | Washington State | 12 | |
| 25 | Oct 30, 2004 | Sat | UCLA | 21 | Stanford | 0 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 26 | Nov 6, 2004 | Sat | Arizona | 23 | @ | Washington | 13 | |
| 27 | Nov 6, 2004 | Sat | (23) Arizona State | 34 | Stanford | 31 | ||
| 28 | Nov 6, 2004 | Sat | (4) California | 28 | Oregon | 27 | ||
| 29 | Nov 6, 2004 | Sat | (1) Southern California | 28 | @ | Oregon State | 20 | |
| 30 | Nov 6, 2004 | Sat | Washington State | 31 | @ | UCLA | 29 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 31 | Nov 13, 2004 | Sat | (20) Arizona State | 45 | Washington State | 28 | ||
| 32 | Nov 13, 2004 | Sat | (5) California | 42 | @ | Washington | 12 | |
| 33 | Nov 13, 2004 | Sat | Oregon State | 24 | @ | Stanford | 19 | |
| 34 | Nov 13, 2004 | Sat | (1) Southern California | 49 | Arizona | 9 | ||
| 35 | Nov 13, 2004 | Sat | UCLA | 34 | @ | Oregon | 26 | |
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 36 | Nov 20, 2004 | Sat | (4) California | 41 | Stanford | 6 | ||
| 37 | Nov 20, 2004 | Sat | Oregon State | 50 | Oregon | 21 | ||
| 38 | Nov 20, 2004 | Sat | Washington State | 28 | Washington | 25 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 39 | Nov 26, 2004 | Fri | Arizona | 34 | (18) Arizona State | 27 | ||
| Rk | Date | Day | Winner/Tie | Pts | Loser/Tie | Pts | Notes | |
| 40 | Dec 4, 2004 | Sat | (1) Southern California | 29 | @ | UCLA | 24 |