| 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 | Minnesota | 10 to 13 | 29 | 61 |
| 3 | 77 | 3.986 | (0,2) | 4.986 | Colorado | 14 to 36 | 41 | 84 |
| 4 | 59 | 1.860 | (1,2) | 2.193 | Northern Illinois | 35 to 11 | 124 | 130 |
| 5 | 100 | 1.345 | (2,2) | 1.345 | Louisiana Tech | 28 to 14 | 233 | 243 |
| 6 | 85 | 1.366 | (2,3) | 1.566 | Michigan | 7 to 45 | 4 | 2 |
| 7 | 65 | 1.513 | (3,3) | 1.513 | Illinois | 20 to 7 | 87 | 73 |
| 8 | 63 | 1.506 | (3,3) | 1.506 | --bye-- |
| 9 | 47 | 1.600 | (4,3) | 1.457 | Northwestern | 17 to 9 | 83 | 35 |
| 10 | 39 | 1.737 | (5,3) | 1.487 | Purdue | 31 to 14 | 86 | 83 |
| 11 | 58 | 1.530 | (5,4) | 1.419 | Michigan St | 17 to 20 | 80 | 72 |
| 12 | 70 | 1.421 | (5,5) | 1.421 | Maryland | 10 to 13 | 49 | 36 |
| 13 | 79 | 1.309 | (5,6) | 1.400 | Wisconsin | 17 to 24 | 49 | 53 |
| 14 | 81 | 1.358 | (5,7) | 1.524 | Iowa | 10 to 13 | 13 | 16 |
| 15 | 86 | 1.273 | (5,7) | 1.439 | --bye-- |
| 16 | 84 | 1.269 | (5,7) | 1.435 | --bye-- |
| 17 | 85 | 1.249 | (5,7) | 1.416 | --bye-- |
| 18 | 81 | 1.271 | (5,7) | 1.438 | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |