| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 0 | 9 | 0.000 | (0,0) | 0.000 | --bye-- |
| 1 | 518 | -0.500 | (0,1) | 0.500 | Tulane | 3 to 23 | 7 | 25 |
| 2 | 10 | 3.508 | (1,1) | 3.508 | W Illinois | 42 to 7 | 28 | 285 |
| 3 | 115 | 1.041 | (1,2) | 1.375 | Oregon | 14 to 34 | 39 | 13 |
| 4 | 166 | 0.745 | (1,2) | 1.078 | --bye-- |
| 5 | 98 | 1.217 | (2,2) | 1.217 | UCLA | 17 to 14 | 228 | 73 |
| 6 | 60 | 1.533 | (3,2) | 1.333 | ULM | 42 to 7 | 103 | 142 |
| 7 | 53 | 1.664 | (4,2) | 1.331 | Penn St | 22 to 21 | 101 | 98 |
| 8 | 42 | 1.730 | (5,2) | 1.301 | Purdue | 19 to 0 | 93 | 121 |
| 9 | 53 | 1.624 | (5,3) | 1.374 | Nebraska | 21 to 28 | 36 | 46 |
| 10 | 55 | 1.599 | (5,3) | 1.349 | --bye-- |
| 11 | | | | | USC | | | 18 |
| 12 | | | | | Michigan | | | 14 |
| 13 | | | | | Minnesota | | | 50 |
| 14 | | | | | Illinois | | | 24 |
| 15 | | | | | --bye-- |
| 16 | | | | | --bye-- |
| 17 | | | | | --bye-- |
| 18 | | | | | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |