| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 0 | 1 | 0.500 | (1,0) | -0.500 | Kansas St | 24 to 21 | 694 | 54 |
| 1 | 4 | 0.833 | (2,0) | -0.167 | South Dakota | 55 to 7 | 512 | 79 |
| 2 | 416 | -0.422 | (3,0) | -1.422 | Iowa | 16 to 13 | 613 | 27 |
| 3 | 68 | 1.432 | (4,0) | 0.432 | Arkansas St | 24 to 16 | 176 | 109 |
| 4 | 22 | 1.932 | (4,0) | 0.932 | --bye-- |
| 5 | 15 | 2.189 | (5,0) | 1.189 | Arizona | 39 to 14 | 32 | 29 |
| 6 | 26 | 1.943 | (5,1) | 1.276 | Cincinnati | 30 to 38 | 31 | 57 |
| 7 | 32 | 1.852 | (5,2) | 1.424 | Colorado | 17 to 24 | 48 | 96 |
| 8 | 31 | 1.841 | (5,2) | 1.412 | --bye-- |
| 9 | 32 | 1.820 | (5,3) | 1.570 | BYU | 27 to 41 | 8 | 6 |
| 10 | 38 | 1.715 | (5,4) | 1.604 | Arizona St | 19 to 24 | 23 | 32 |
| 11 | 31 | 1.798 | (6,4) | 1.598 | TCU | 20 to 17 | 34 | 21 |
| 12 | 30 | 1.825 | (6,4) | 1.625 | --bye-- |
| 13 | 28 | 1.837 | (7,4) | 1.564 | Kansas | 38 to 14 | 86 | 88 |
| 14 | 30 | 1.831 | (8,4) | 1.498 | Oklahoma St | 20 to 13 | 173 | 161 |
| 15 | 30 | 1.842 | (8,4) | 1.509 | --bye-- |
| 16 | 31 | 1.829 | (8,4) | 1.496 | --bye-- |
| 17 | 29 | 1.842 | (8,4) | 1.508 | --bye-- |
| 18 | 28 | 1.868 | (8,4) | 1.535 | --bye-- |
| 19 | 28 | 1.848 | (8,4) | 1.515 | --bye-- |
| 20 | | | | | --bye-- |
| 21 | | | | | --bye-- |