| 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 | Boise St | 56 to 19 | 424 | 46 |
| 3 | 212 | 1.905 | (2,0) | 0.905 | Tulsa | 43 to 10 | 329 | 178 |
| 4 | 7 | 2.713 | (3,0) | 1.713 | Michigan St | 41 to 7 | 65 | 72 |
| 5 | 7 | 2.610 | (4,0) | 1.610 | California | 59 to 32 | 66 | 45 |
| 6 | 7 | 2.469 | (5,0) | 1.469 | Arizona | 31 to 24 | 93 | 12 |
| 7 | 10 | 2.387 | (5,0) | 1.387 | --bye-- |
| 8 | 2 | 2.521 | (6,0) | 1.521 | Oregon | 36 to 33 | 19 | 6 |
| 9 | 5 | 2.340 | (7,0) | 1.340 | Arizona St | 15 to 7 | 147 | 87 |
| 10 | 2 | 2.436 | (8,0) | 1.436 | Stanford | 42 to 33 | 89 | 88 |
| 11 | 2 | 2.505 | (9,0) | 1.505 | Southern Cal | 52 to 42 | 21 | 21 |
| 12 | 1 | 2.590 | (10,0) | 1.590 | Utah | 35 to 28 | 16 | 23 |
| 13 | 1 | 2.601 | (11,0) | 1.601 | Oregon St | 22 to 20 | 17 | 25 |
| 14 | 1 | 2.669 | (12,0) | 1.669 | Washington St | 24 to 21 | 71 | 68 |
| 15 | 1 | 2.650 | (13,0) | 1.650 | Oregon | 34 to 31 | 8 | 6 |
| 16 | 1 | 2.641 | (13,0) | 1.641 | --bye-- |
| 17 | 1 | 2.619 | (13,0) | 1.619 | --bye-- |
| 18 | 1 | 2.688 | (14,0) | 1.688 | Texas | 37 to 31 | 4 | 4 |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |