2018 Pac-12 Conference Leaders Opponent Penalties - Games in October Only through 01/07/2019
| Name | G | Pen. | Yards | Pen./G | Yards/G | |
|---|---|---|---|---|---|---|
| 1 | Arizona | 4 | 40 | 365 | 10.0 | 91.3 |
| 2 | Colorado | 4 | 28 | 265 | 7.0 | 66.3 |
| 3 | Stanford | 3 | 23 | 240 | 7.7 | 80.0 |
| 4 | Oregon | 3 | 21 | 199 | 7.0 | 66.3 |
| 5 | USC | 3 | 20 | 198 | 6.7 | 66.0 |
| 6 | Arizona State | 3 | 18 | 193 | 6.0 | 64.3 |
| 7 | Washington | 4 | 19 | 187 | 4.8 | 46.8 |
| 8 | Washington State | 3 | 20 | 166 | 6.7 | 55.3 |
| 8 | Oregon State | 3 | 16 | 166 | 5.3 | 55.3 |
| 10 | California | 4 | 23 | 163 | 5.8 | 40.8 |
| 11 | UCLA | 4 | 15 | 155 | 3.8 | 38.8 |
| 12 | Utah | 4 | 14 | 136 | 3.5 | 34.0 |