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Prop markets exist when games do. That sounds obvious until a board is empty in June and it reads as a broken site rather than as a sport between seasons. This is the shape of the year, and which of it Parlay Builder has a model behind.
Approximate windows: every league moves its dates, and post-season length depends on who is playing:
Read down that list and the quiet stretch is obvious: late June to mid-July, when only baseball and the WNBA are running, and the second half of February, after the NFL has finished and before baseball starts. Those are the weeks a board looks thin because it is.
| Month | NBA | NFL | MLB | WNBA |
|---|---|---|---|---|
| January | All month | All month | Off | Off |
| February | All month | To the 15th | Off | Off |
| March | All month | Off | From the 15th | Off |
| April | All month | Off | All month | Off |
| May | All month | Off | All month | From the 15th |
| June | To the 15th | Off | All month | All month |
| July | Off | Off | All month | All month |
| August | Off | Off | All month | All month |
| September | Off | All month | All month | All month |
| October | From the 15th | All month | All month | To the 15th |
| November | All month | All month | Off | Off |
| December | All month | All month | Off | Off |
The table is generated from the same season windows the site falls back on when no live schedule has loaded, so it cannot disagree with them. Those windows are approximate and identical every year: leagues move their dates, and a post-season runs as long as its matchups make it. Where the schedule is available the board reads that instead, so an off month here is a month the site does not expect a slate, not a promise that there is none.
Read straight off the table above. These are approximate windows, not this year’s fixture list.
Take February, the row across all four leagues:
So in February, one of the four leagues is in season for the whole month, one for part of it, and two not at all. That is the thin stretch described above, read off the same windows rather than remembered.
Not when the season starts. Futures and season-long markets appear months ahead, while player props for a specific game usually arrive somewhere between the evening before and a few hours before first pitch or tip-off, and for baseball and the WNBA that window is genuinely short, because books wait on lineups.
So a league can be firmly in season and still show an empty prop board at ten in the morning. That is the books, not the site. The board fills as prices are posted, and the pages here are rebuilt daily against whatever exists.
The same URL, with different content. A player page out of season keeps its address and shows the measured history on its own: the game log, the hit rate at every threshold that log supports, the home and away splits, and says plainly that nothing is posted. It does not print a line, because printing a line nobody is offering is worse than printing none.
That is deliberate and it is why the site has a set of pages that do not depend on a slate at all. The market insight pages describe how a market behaves across a whole league from two years of box scores, which is a question with an answer in July.
College football, soccer including the World Cup, tennis, UFC, golf and the NHL all have busy betting markets and none of them has a model here. We keep no hit-rate history for them, so no prop in those sports can get a score, a grade or a measured comparison, and offering them would advertise something the product does not run.
The honest version is the one on this page: they exist, they are part of anyone’s calendar, and for them this site has nothing to add.
Either no games are scheduled, or the books have not posted prices for the ones that are. Player props typically appear from the evening before down to a few hours before the game, and for MLB and the WNBA the books wait on lineups. The board fills as prices arrive rather than padding itself with what it has.
Late June into mid-July, when only MLB and the WNBA are running, and the back half of February, after the NFL season has finished and before baseball starts. Both are calendar facts rather than a problem with any particular site.
Yes, at the same URL. Out of season a player page shows the measured game log, the hit rate at every threshold that log supports and the venue splits, and states that nothing is currently priced. The live board returns to the top of the page the morning after the books open the market again.
No. The four leagues with a scoring model behind them are NBA, NFL, MLB and WNBA. A sport with no box-score history loaded here cannot get a hit rate, so it is not offered rather than offered thinly.
How a market behaves across a whole league: measured from box scores, no slate required. Read the market insight pages.
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Odds and lines come from licensed data feeds and refresh on a schedule; hit rates and grades are Parlay Builder’s own calculations.