| Week | Rank | Rate | Record | SOS | Opponent | Score | Rank Then | Rank Now |
| 1 | 40 | 0.000 | (0,0) | 0.000 | --bye-- |
| 2 | 29 | 0.500 | (1,0) | -0.500 | Central Washington | 35 to 10 | 424 | 150 |
| 3 | 238 | 1.577 | (2,0) | 0.577 | Northern Iowa | 34 to 17 | 357 | 131 |
| 4 | 119 | 1.328 | (2,1) | 0.995 | Utah | 7 to 31 | 38 | 23 |
| 5 | 108 | 1.288 | (2,2) | 1.288 | Montana St | 0 to 40 | 96 | 97 |
| 6 | 95 | 1.257 | (3,2) | 1.057 | Northern Colorado | 28 to 21 | 390 | 401 |
| 7 | 128 | 1.008 | (3,3) | 1.008 | Northern Arizona | 10 to 27 | 163 | 152 |
| 8 | 151 | 0.880 | (3,4) | 1.022 | UC-Davis | 16 to 17 | 138 | 119 |
| 9 | 170 | 0.724 | (3,5) | 0.974 | Eastern Washington | 23 to 31 | 160 | 211 |
| 10 | 186 | 0.713 | (3,5) | 0.963 | --bye-- |
| 11 | 161 | 0.810 | (4,5) | 0.921 | Idaho St | 33 to 21 | 228 | 246 |
| 12 | 140 | 0.915 | (5,5) | 0.915 | Idaho | 31 to 29 | 100 | 95 |
| 13 | 145 | 0.912 | (6,5) | 0.822 | Cal Poly SLO | 48 to 21 | 317 | 304 |
| 14 | 130 | 0.997 | (6,5) | 0.906 | --bye-- |
| 15 | 134 | 0.913 | (6,5) | 0.822 | --bye-- |
| 16 | 138 | 0.899 | (6,5) | 0.808 | --bye-- |
| 17 | 135 | 0.888 | (6,5) | 0.797 | --bye-- |
| 18 | 138 | 0.869 | (6,5) | 0.778 | --bye-- |
| 19 | | | | | --bye-- |
| 20 | | | | | --bye-- |