| 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 | North Texas | 58 to 21 | 424 | 149 |
| 3 | 49 | 4.594 | (1,1) | 4.594 | Auburn | 10 to 14 | 21 | 62 |
| 4 | 49 | 2.012 | (2,1) | 1.679 | Idaho | 31 to 17 | 82 | 95 |
| 5 | 66 | 1.620 | (2,2) | 1.620 | Washington | 32 to 59 | 7 | 1 |
| 6 | 54 | 1.665 | (3,2) | 1.465 | Arizona St | 24 to 21 | 196 | 87 |
| 7 | 64 | 1.515 | (3,3) | 1.515 | Oregon St | 40 to 52 | 24 | 25 |
| 8 | 65 | 1.483 | (3,4) | 1.626 | Utah | 14 to 34 | 15 | 23 |
| 9 | 61 | 1.470 | (3,4) | 1.613 | --bye-- |
| 10 | 66 | 1.461 | (3,5) | 1.711 | Southern Cal | 49 to 50 | 17 | 21 |
| 11 | 66 | 1.417 | (3,6) | 1.750 | Oregon | 19 to 63 | 11 | 6 |
| 12 | 57 | 1.505 | (4,6) | 1.705 | Washington St | 42 to 39 | 95 | 68 |
| 13 | 50 | 1.546 | (5,6) | 1.637 | Stanford | 27 to 15 | 93 | 88 |
| 14 | 39 | 1.714 | (6,6) | 1.714 | UCLA | 33 to 7 | 40 | 34 |
| 15 | 39 | 1.643 | (6,6) | 1.643 | --bye-- |
| 16 | 40 | 1.627 | (6,6) | 1.627 | --bye-- |
| 17 | 50 | 1.542 | (6,7) | 1.619 | Texas Tech | 14 to 34 | 39 | 40 |
| 18 | 45 | 1.548 | (6,7) | 1.625 | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |