2018 Washington State Cougars Penalty Split Stats through 01/07/2019
| Split | G | Pen. | Yards | Pen./G | Yards/G |
|---|---|---|---|---|---|
| All Games | 13 | 86 | 838 | 6.6 | 64.5 |
| at Home | 7 | 43 | 435 | 6.1 | 62.1 |
| on Road/Neutral Site | 6 | 43 | 403 | 7.2 | 67.2 |
| in Wins | 11 | 71 | 699 | 6.5 | 63.5 |
| in Losses | 2 | 15 | 139 | 7.5 | 69.5 |
| vs. Conference | 9 | 55 | 558 | 6.1 | 62.0 |
| vs. Non-Conference | 4 | 31 | 280 | 7.8 | 70.0 |
| vs. Ranked (AP) | 1 | 4 | 21 | 4.0 | 21.0 |
| vs. Unranked (AP) | 12 | 82 | 817 | 6.8 | 68.1 |
| vs. FBS (I-A) | 12 | 79 | 758 | 6.6 | 63.2 |
| vs. FCS (I-AA) | 1 | 7 | 80 | 7.0 | 80.0 |
| vs. FBS Winning | 6 | 40 | 414 | 6.7 | 69.0 |
| vs. FBS Non-Winning | 6 | 39 | 344 | 6.5 | 57.3 |
| vs. FBS Power 5 | 10 | 61 | 623 | 6.1 | 62.3 |
| vs. FBS non-Power 5 | 2 | 18 | 135 | 9.0 | 67.5 |
| in August/September | 5 | 45 | 437 | 9.0 | 87.4 |
| in October | 3 | 19 | 190 | 6.3 | 63.3 |
| in November | 4 | 16 | 146 | 4.0 | 36.5 |
| in December/January | 1 | 6 | 65 | 6.0 | 65.0 |