| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 1 | 40 | 0.000 | (0,0) | 0.000 | --bye-- |
| 2 | 424 | -0.500 | (0,1) | 0.500 | Fresno St | 35 to 39 | 29 | 58 |
| 3 | 19 | 5.867 | (1,1) | 5.867 | Virginia Tech | 24 to 17 | 30 | 55 |
| 4 | 84 | 1.594 | (1,2) | 1.927 | Syracuse | 20 to 35 | 35 | 86 |
| 5 | 134 | 1.078 | (1,3) | 1.578 | Wisconsin | 17 to 38 | 62 | 53 |
| 6 | 78 | 1.448 | (2,3) | 1.648 | Illinois | 44 to 19 | 69 | 73 |
| 7 | 84 | 1.385 | (2,4) | 1.719 | Iowa | 14 to 20 | 14 | 16 |
| 8 | 76 | 1.424 | (2,5) | 1.852 | Ohio State | 7 to 41 | 4 | 7 |
| 9 | 76 | 1.348 | (2,5) | 1.777 | --bye-- |
| 10 | 86 | 1.289 | (2,6) | 1.789 | Nebraska | 14 to 31 | 39 | 81 |
| 11 | 95 | 1.271 | (2,7) | 1.827 | Michigan | 13 to 41 | 6 | 2 |
| 12 | 73 | 1.392 | (3,7) | 1.792 | Minnesota | 49 to 30 | 53 | 61 |
| 13 | 91 | 1.244 | (3,8) | 1.698 | Northwestern | 15 to 23 | 54 | 35 |
| 14 | 80 | 1.359 | (4,8) | 1.692 | Indiana | 35 to 31 | 120 | 125 |
| 15 | 85 | 1.274 | (4,8) | 1.607 | --bye-- |
| 16 | 83 | 1.271 | (4,8) | 1.604 | --bye-- |
| 17 | 83 | 1.256 | (4,8) | 1.589 | --bye-- |
| 18 | 83 | 1.258 | (4,8) | 1.592 | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |