Road Underdogs Who Close At 5.5 Cover 61.9 Percent. The 6.5s Are 44 And 44
The study is eleven NFL regular seasons, 2015 through 2025. The four tickets from 20 September 2026 are a worked example of those base rates, not a second sample. That card had four underdogs and four different numbers: Jacksonville +2.5, the Jets +4 at home, Minnesota +5.5, Indianapolis +6.5. Two of those prices needed 54.95 percent at -122. That is a lot of points to ask from a base rate, so we counted what those closing lines have actually done.
The result is not "dogs cover." It is that 5.5 and 6.5 are not the same bet. Games that close with the road team getting 5.5 have covered 61.9 percent of the time. Games that close at 6.5 are 44 and 44.
What we measured
Every NFL regular season game from 2015 through 2025, 2,895 games, using closing spreads from the nflverse schedule file. 2015 is the first season with the longer extra point. We then kept four slices, one for each ticket on the card, at the exact closing line:
| Closing line | Games | Covered | Lost | Pushes | Cover rate | Break even on this card |
|---|---|---|---|---|---|---|
| Road +2.5 | 159 | 88 | 71 | 0 | 55.3% | 50.74% at -103 |
| Home +4 | 47 | 27 | 19 | 1 | 58.7% | 60.00% at -150 |
| Road +5.5 | 84 | 52 | 32 | 0 | 61.9% | 54.95% at -122 |
| Road +6.5 | 88 | 44 | 44 | 0 | 50.0% | 54.95% at -122 |
Read the last two rows first. Both tickets on this card are priced at -122. One of those closing lines has cleared 54.95 percent by seven points. The other has not cleared it at all.
The 5.5 market and the 6.5 market are different games
That gap is not a half point of hook value. It is two different groups of games. When we put every road underdog of 5.5 or 6.5 into one pile, 257 games, and then score both lines against the same scoreboard, the hook shows up the way it should:
| 257 games that closed 5.5 or 6.5 | Covered | Lost | Rate |
|---|---|---|---|
| Would have covered +5.5 | 134 | 123 | 52.1% |
| Would have covered +6.5 | 147 | 110 | 57.2% |
| Home team won by exactly 6 | 13 | 5.1% of the sample |
Thirteen games decided by exactly 6 points. Those are the only games that lose +5.5 and cash +6.5. That is 5.1 percentage points, and it is why the combined sample moves from 52.1 to 57.2 when you buy the extra point. At -122 you need 54.95. On this combined pile, +5.5 is short and +6.5 clears.
The closing line split tells a different story. The market does not put the same kind of game on 5.5 that it puts on 6.5. The 84 games that actually closed at 5.5 covered 61.9 percent. The 88 that closed at 6.5 covered 50.0. Buying 6.5 because "it is more points" is buying the group that has not beaten the juice.
A worked example from 20 September 2026
Minnesota was +5.5 at Chicago. That is the 61.9 percent bucket, and 61.9 against 54.95 is the widest gap on that card. Jacksonville was +2.5 at Denver. Road +2.5 has covered 55.3 percent of 159 games, and -103 only needs 50.74. Indianapolis was +6.5 at Kansas City. That is the 50.0 percent bucket against the same 54.95 the Vikings ticket needed. The extra point is not helping.
The Jets were +4 at home at -150. Home +4 is 27, 19 and 1 in 47 games, 58.7 percent. The price needs 60.0. The sample is the smallest of the four, and the number does not clear. That was the honest starting line on MetLife that week, before anyone talked about Green Bay losing 39-22 the week before.
What this study does not tell you
It does not know Minkah Fitzpatrick is out, or that Denver had 176 yards on Monday night, or that Kansas City went 6-11 last season. It cannot see the 79 percent rain chance at Soldier Field. Base rates set the bar. The matchup has to clear it, and on the 6.5 ticket the bar is already above what that closing line has done.
Method: NFL regular season games from the nflverse schedule file, closing spreads as recorded there, 2015 through 2025, 2,895 games with a result and a spread. Home favorite is a positive spread_line. Road +5.5 means the home team closed at 5.5. Cover at +L means the underdog's margin plus L is greater than 0. One home +4 game landed on a push. Sunday's prices were the TrustMyRecord board numbers locked on the four tickets: Jets +4 -150, Vikings +5.5 -122, Jaguars +2.5 -103, Colts +6.5 -122, read 20 September 2026.