Season-final Elo for all four rated units. These are the opponent-strength values every player performance against Illinois St. is judged with.
| Season | Rush Offense | Pass Offense | Rush Defense | Pass Defense |
|---|---|---|---|---|
| 2025 | 1351 | 1160 | 1343 | 1233 |
| 2024 | 1330 | 1148 | 1294 | 1240 |
| 2023 | 1314 | 1096 | 1361 | 1298 |
| 2022 | 1204 | 1068 | 1358 | 1311 |
| 2021 | 1256 | 1070 | 1412 | 1308 |
| 2020 | 1325 | 1108 | 1450 | 1380 |
| 2019 | 1324 | 1120 | 1426 | 1352 |
| 2018 | 1342 | 1268 | 1358 | 1285 |
| 2017 | 1334 | 1245 | 1366 | 1271 |
| 2016 | 1344 | 1282 | 1388 | 1219 |
| 2015 | 1405 | 1242 | 1342 | 1190 |
| 2014 | 1358 | 1255 | 1340 | 1184 |
| 2013 | 1124 | 1184 | 1251 | 1204 |
| 2012 | 1158 | 1188 | 1194 | 1208 |
| 2011 | 1179 | 1188 | 1154 | 1178 |
| 2010 | 1175 | 1174 | 1108 | 1170 |
| 2009 | 1180 | 1172 | 1122 | 1166 |
| 2008 | 1223 | 1142 | 1105 | 1207 |
| 2007 | 1210 | 1181 | 1129 | 1206 |
| 2006 | 1202 | 1188 | 1154 | 1206 |
| 2005 | 1170 | 1160 | 1132 | 1180 |
| 2004 | 1172 | 1141 | 1152 | 1180 |
| 2003 | 1180 | 1173 | 1159 | 1180 |
| 2002 | 1178 | 1174 | 1165 | 1186 |
| 2001 | 1166 | 1164 | 1169 | 1177 |