1998 NCAA Division I-A football rankings AP poll AP poll

| Preseason | Week_1_Sept_7 | Week_2_Sept_14 | Week_3_Sept_21 | Week_4_Sept_28 | Week_5_Oct_5 | Week_6_Oct_12 | Week_7_Oct_19 | Week_8_Oct_26 | Week_9_Nov_2 | Week_10_Nov_9 | Week_11_Nov_16 | Week_12_Nov_23 | Week_13_Nov_30 | Week_14_Dec_7 | Week_15_Final_Jan_5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Michigan (4) | Kansas State (1-0) (2) | Kansas State (2-0) (2) | Kansas State (3-0) (2) | Kansas State (4-0) (2) | Kansas State (4-0) (2) | Florida (5-1) | Florida (6-1) | Florida State (7-1) | Florida (7-1) | Florida State (9-1) (1) | Florida State (10-1) | Ohio State (10-1) | Ohio State (10-1) | Arizona (11-1) | Florida (10-2) |
| Kansas State (2) | UCLA (0-0) (1) | Tennessee (1-0) | LSU (2-0) | LSU (3-0) | Florida (4-1) | Florida State (5-1) | Florida State (6-1) | Florida (6-1) | Florida State (8-1) | Texas A&M (9-1) | Texas A&M (10-1) | Texas A&M (10-1) | Arizona (11-1) | UCLA (10-1) | Wisconsin (11-1) |
| UCLA (1) | LSU (0-0) | LSU (1-0) | Penn State (3-0) | Penn State (3-0) | Georgia (4-0) | Virginia (5-0) | Nebraska (6-1) | Nebraska (7-1) | Texas A&M (8-1) | Ohio State (8-1) | Ohio State (9-1) | Arizona (10-1) | Florida (9-2) | Florida (9-2) | Tulane (12-0) |