| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 0 | 9 | 0.000 | (0,0) | 0.000 | --bye-- |
| 1 | 7 | 0.500 | (1,0) | -0.500 | Colorado St | 38 to 21 | 518 | 173 |
| 2 | 52 | 1.632 | (2,0) | 0.632 | UC Davis | 70 to 10 | 121 | 73 |
| 3 | 58 | 1.536 | (2,0) | 0.536 | --bye-- |
| 4 | 11 | 2.358 | (3,0) | 1.358 | Washington St | 59 to 24 | 38 | 61 |
| 5 | 14 | 2.216 | (3,1) | 1.716 | Ohio St | 6 to 24 | 4 | 4 |
| 6 | 12 | 2.201 | (4,1) | 1.601 | Maryland | 24 to 20 | 50 | 114 |
| 7 | 8 | 2.278 | (5,1) | 1.612 | Rutgers | 38 to 19 | 104 | 75 |
| 8 | 23 | 1.934 | (5,2) | 1.505 | Michigan | 7 to 24 | 22 | 18 |
| 9 | 14 | 2.097 | (6,2) | 1.597 | Illinois | 42 to 25 | 30 | 19 |
| 10 | 16 | 2.058 | (6,2) | 1.558 | --bye-- |
| 11 | 27 | 1.855 | (6,3) | 1.521 | Wisconsin | 10 to 13 | 73 | 59 |
| 12 | 25 | 1.888 | (7,3) | 1.488 | Purdue | 49 to 13 | 120 | 111 |
| 13 | 22 | 1.912 | (8,3) | 1.457 | UCLA | 48 to 14 | 82 | 84 |
| 14 | 29 | 1.832 | (8,4) | 1.499 | Oregon | 14 to 26 | 3 | 2 |
| 15 | 29 | 1.845 | (8,4) | 1.512 | --bye-- |
| 16 | 22 | 1.900 | (9,4) | 1.515 | Boise St | 38 to 10 | 46 | 50 |
| 17 | 21 | 1.917 | (9,4) | 1.533 | --bye-- |
| 18 | 23 | 1.927 | (9,4) | 1.543 | --bye-- |
| 19 | 23 | 1.917 | (9,4) | 1.532 | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |