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 | 1349 | 1158 | 1342 | 1232 |
| 2024 | 1328 | 1146 | 1292 | 1240 |
| 2023 | 1313 | 1094 | 1360 | 1298 |
| 2022 | 1202 | 1066 | 1356 | 1310 |
| 2021 | 1256 | 1068 | 1410 | 1307 |
| 2020 | 1324 | 1107 | 1450 | 1378 |
| 2019 | 1323 | 1118 | 1425 | 1351 |
| 2018 | 1340 | 1266 | 1356 | 1283 |
| 2017 | 1331 | 1243 | 1364 | 1268 |
| 2016 | 1340 | 1280 | 1386 | 1216 |
| 2015 | 1402 | 1238 | 1340 | 1187 |
| 2014 | 1354 | 1252 | 1338 | 1182 |
| 2013 | 1120 | 1182 | 1249 | 1202 |
| 2012 | 1154 | 1186 | 1192 | 1206 |
| 2011 | 1176 | 1186 | 1152 | 1176 |
| 2010 | 1172 | 1171 | 1106 | 1168 |
| 2009 | 1177 | 1170 | 1121 | 1164 |
| 2008 | 1220 | 1140 | 1104 | 1206 |
| 2007 | 1208 | 1180 | 1130 | 1206 |
| 2006 | 1201 | 1187 | 1154 | 1206 |
| 2005 | 1169 | 1160 | 1132 | 1180 |
| 2004 | 1171 | 1141 | 1152 | 1180 |
| 2003 | 1180 | 1173 | 1159 | 1180 |
| 2002 | 1178 | 1174 | 1165 | 1186 |
| 2001 | 1166 | 1164 | 1169 | 1177 |