| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 1 | 40 | 0.000 | (0,0) | 0.000 | --bye-- |
| 2 | 29 | 0.500 | (1,0) | -0.500 | San Jose St | 42 to 17 | 424 | 67 |
| 3 | 38 | 5.134 | (2,0) | 4.134 | UC-Davis | 55 to 7 | 73 | 119 |
| 4 | 18 | 2.483 | (3,0) | 1.483 | San Diego St | 26 to 9 | 97 | 134 |
| 5 | 63 | 1.660 | (3,1) | 1.160 | Washington St | 35 to 38 | 25 | 68 |
| 6 | 24 | 2.085 | (4,1) | 1.485 | Utah | 21 to 7 | 18 | 23 |
| 7 | 24 | 2.130 | (5,1) | 1.463 | California | 52 to 40 | 64 | 45 |
| 8 | 11 | 2.283 | (6,1) | 1.569 | UCLA | 36 to 24 | 23 | 34 |
| 9 | 10 | 2.245 | (6,1) | 1.530 | --bye-- |
| 10 | 21 | 2.021 | (6,2) | 1.521 | Arizona | 24 to 27 | 37 | 12 |
| 11 | 19 | 2.021 | (7,2) | 1.466 | Colorado | 26 to 19 | 59 | 84 |
| 12 | 17 | 2.031 | (8,2) | 1.431 | Stanford | 62 to 17 | 85 | 88 |
| 13 | 17 | 1.989 | (8,3) | 1.534 | Washington | 20 to 22 | 1 | 1 |
| 14 | 20 | 2.026 | (8,4) | 1.692 | Oregon | 7 to 31 | 7 | 6 |
| 15 | 19 | 1.949 | (8,4) | 1.616 | --bye-- |
| 16 | 20 | 1.941 | (8,4) | 1.607 | --bye-- |
| 17 | 20 | 1.930 | (8,4) | 1.596 | --bye-- |
| 18 | 25 | 1.862 | (8,5) | 1.631 | Notre Dame | 8 to 40 | 15 | 15 |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |