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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Florida State (22) | Florida State (1-0) (22) | Florida (2-0) (9) | Nebraska (3-0) (1) | Nebraska (4-0) (7) | Nebraska (5-0) (1) | UCLA (4-0) (1) | UCLA (5-0) (1) | UCLA (6-0) (1) | Tennessee (7-0) (3) | Kansas State (9-0) (19) | Kansas State (10-0) (29) | Kansas State (11-0) (24) | Kansas State (11-0) (24) | Florida State (11-1) | Ohio State (11-1) |
| Florida (5) | Florida (1-0) (4) | Nebraska (3-0) (1) | UCLA (2-0) (1) | Tennessee (3-0) (2) | UCLA (3-0) (1) | Tennessee (5-0) (3) | Tennessee (5-0) (3) | Tennessee (6-0) (3) | UCLA (7-0) (1) | UCLA (8-0) (4) | UCLA (9-0) (4) | UCLA (10-0) (4) | UCLA (10-0) (3) | Ohio State (10-1) | Florida State (11-2) |
| Nebraska (4) | Nebraska (2-0) (2) | UCLA (1-0) (1) | Tennessee (2-0) (2) | UCLA (2-0) (1) | Tennessee (4-0) | Kansas State (5-0) (2) | Kansas State (6-0) (2) | Kansas State (7-0) (2) | Kansas State (8-0) (3) | Florida (8-1) | Florida (9-1) | Florida State (11-1) | Florida State (11-1) | Kansas State (11-1) | Arizona (12-1) |