| 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 | New Mexico | 34 to 17 | 518 | 59 |
| 2 | 587 | -0.828 | (1,1) | -0.828 | Oklahoma | 13 to 24 | 319 | 11 |
| 3 | 134 | 0.977 | (2,1) | 0.643 | C Michigan | 63 to 3 | 408 | 132 |
| 4 | 28 | 1.853 | (3,1) | 1.353 | Nebraska | 30 to 27 | 77 | 46 |
| 5 | 11 | 2.266 | (3,1) | 1.766 | --bye-- |
| 6 | 14 | 2.159 | (4,1) | 1.559 | Wisconsin | 24 to 10 | 94 | 96 |
| 7 | 34 | 1.874 | (4,2) | 1.541 | USC | 13 to 31 | 18 | 18 |
| 8 | 22 | 2.026 | (5,2) | 1.598 | Washington | 24 to 7 | 23 | 16 |
| 9 | 17 | 2.141 | (6,2) | 1.641 | Michigan St | 31 to 20 | 88 | 93 |
| 10 | 14 | 2.152 | (7,2) | 1.597 | Purdue | 21 to 16 | 121 | 121 |
| 11 | | | | | --bye-- |
| 12 | | | | | Northwestern | | | 55 |
| 13 | | | | | Maryland | | | 84 |
| 14 | | | | | Ohio St | | | 3 |
| 15 | | | | | --bye-- |
| 16 | | | | | --bye-- |
| 17 | | | | | --bye-- |
| 18 | | | | | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |