2018 Washington State Cougars Opponent Penalty Split Stats through 01/07/2019
| Split | G | Pen. | Yards | Pen./G | Yards/G |
|---|---|---|---|---|---|
| All Games | 13 | 94 | 785 | 7.2 | 60.4 |
| at Home | 7 | 45 | 375 | 6.4 | 53.6 |
| on Road/Neutral Site | 6 | 49 | 410 | 8.2 | 68.3 |
| in Wins | 11 | 80 | 673 | 7.3 | 61.2 |
| in Losses | 2 | 14 | 112 | 7.0 | 56.0 |
| vs. Conference | 9 | 56 | 505 | 6.2 | 56.1 |
| vs. Non-Conference | 4 | 38 | 280 | 9.5 | 70.0 |
| vs. Ranked (AP) | 1 | 6 | 47 | 6.0 | 47.0 |
| vs. Unranked (AP) | 12 | 88 | 738 | 7.3 | 61.5 |
| vs. FBS (I-A) | 12 | 88 | 733 | 7.3 | 61.1 |
| vs. FCS (I-AA) | 1 | 6 | 52 | 6.0 | 52.0 |
| vs. FBS Winning | 6 | 36 | 273 | 6.0 | 45.5 |
| vs. FBS Non-Winning | 6 | 52 | 460 | 8.7 | 76.7 |
| vs. FBS Power 5 | 10 | 66 | 568 | 6.6 | 56.8 |
| vs. FBS non-Power 5 | 2 | 22 | 165 | 11.0 | 82.5 |
| in August/September | 5 | 45 | 358 | 9.0 | 71.6 |
| in October | 3 | 20 | 166 | 6.7 | 55.3 |
| in November | 4 | 19 | 198 | 4.8 | 49.5 |
| in December/January | 1 | 10 | 63 | 10.0 | 63.0 |