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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arizona State (2) | Tennessee (1-0) | Penn State (2-0) | Florida (2-1) | Florida (3-1) | Florida State (4-1) | Nebraska (5-1) | Texas A&M (6-1) | Texas A&M (7-1) | Wisconsin (8-0) | Wisconsin (9-0) | Arizona (10-1) | Florida (9-2) | Wisconsin (10-1) | Texas A&M (11-2) | UCLA (10-2) |
| LSU | Penn State (1-0) | Washington (1-0) | Washington (2-0) | Florida State (3-1) | Virginia (5-0) | Wisconsin (6-0) | Wisconsin (7-0) | Wisconsin (8-0) | Penn State (6-1) | Arizona (9-1) | Arkansas (8-1) | Notre Dame (9-1) | Tulane (11-0) | Wisconsin (10-1) | Georgia Tech (10-2) |
| Tennessee | Notre Dame (1-0) | Virginia (2-0) | Florida State (2-1) | Virginia (4-0) | Arizoan (5-0) | Texas A&M (5-1) | Penn State (5-1) | Penn State (5-1) | Arizona (8-1) | Arkansas (8-0) | Notre Dame (8-1) | Wisconsin (10-1) | Texas A&M (10-2) | Tulane (11-0) | Kansas State (11-2) |