Each season, 136 teams have the opportunity to complete the perfect season. Five weeks into the 2025 season, only 20 teams can still chase this dream. After Week 5 of 2024, 19 teams remained perfect. Oregon was the last team remaining last season, not losing until the CFP quarterfinals. 

Michigan was the last team to complete the perfect season, going 15-0 in 2023 and capturing the national championship.

POLLS: Check out the latest top 25 rankings

Here are the 20 undefeated FBS teams through Week 5:
*Teams are listed alphabetically, times are all Eastern. Rankings are from the AP Top 25 Poll
No. 23 BYU (4-0)

    Previous: def. Colorado, 24-21
    Up next: vs. West Virginia, 10:30 p.m. on Friday, Oct. 3
    Last undefeated season: 1984 | 13-0 | Won national championship

No. 17 Georgia Tech (5-0)

    Previous: def. Wake Forest, 30-29 (OT)
    Up next: vs. Virginia Tech, 3:30 p.m. on Saturday, Oct. 11
    Last undefeated season: 1990 | 11-0-1 | Won national championship (coaches' poll)

Houston (4-0)

    Previous: def. Oregon State, 27-24 (OT)
    Up next: vs. No. 11 Texas Tech, 7 p.m. on Saturday, Oct. 4
    Last undefeated season: Never

No. 8 Indiana (5-0)

    Previous: def. Iowa, 20-15
    Up next: at No. 2 Oregon, 3:30 p.m. on Saturday, Oct. 11
    Last undefeated season: 1945 | 9-0-1 | Won Big Ten Championship