Season-final Elo for all four rated units. These are the opponent-strength values every player performance against Illinois is judged with.
| Season | Rush Offense | Pass Offense | Rush Defense | Pass Defense |
|---|---|---|---|---|
| 2026 | 1444 | 1355 | 1342 | 1331 |
| 2025 | 1442 | 1356 | 1349 | 1332 |
| 2024 | 1470 | 1333 | 1319 | 1302 |
| 2023 | 1442 | 1297 | 1323 | 1290 |
| 2022 | 1480 | 1227 | 1320 | 1314 |
| 2021 | 1456 | 1184 | 1226 | 1214 |
| 2020 | 1450 | 1184 | 1154 | 1170 |
| 2019 | 1401 | 1214 | 1182 | 1181 |
| 2018 | 1414 | 1170 | 1164 | 1197 |
| 2017 | 1240 | 1191 | 1208 | 1291 |
| 2016 | 1277 | 1231 | 1217 | 1302 |
| 2015 | 1228 | 1288 | 1300 | 1275 |
| 2014 | 1221 | 1314 | 1243 | 1181 |
| 2013 | 1312 | 1300 | 1278 | 1208 |
| 2012 | 1318 | 1180 | 1348 | 1263 |
| 2011 | 1422 | 1240 | 1422 | 1296 |
| 2010 | 1498 | 1248 | 1387 | 1236 |
| 2009 | 1416 | 1306 | 1354 | 1209 |
| 2008 | 1442 | 1292 | 1350 | 1242 |
| 2007 | 1489 | 1194 | 1316 | 1223 |
| 2006 | 1361 | 1198 | 1230 | 1260 |
| 2005 | 1314 | 1230 | 1122 | 1222 |
| 2004 | 1324 | 1258 | 1178 | 1262 |
| 2003 | 1270 | 1339 | 1226 | 1302 |
| 2002 | 1320 | 1370 | 1251 | 1332 |
| 2001 | 1298 | 1347 | 1259 | 1348 |
| 2000 | 1291 | 1287 | 1256 | 1342 |