I generally have no idea what is supposed to be in season at any given time. And while often I can infer what's in season - "Hmmm, asparagus has been 0.99/lb fo

I generally have no idea what is supposed to be in season at any given time. And while often I can infer what's in season - "Hmmm, asparagus has been 0.99/lb for the past few weeks, whereas normally it's around 3.99/lb" - the main point is that for many items, but especially produce, the price difference between buying what's on sale and buying what's on a pre-determined list can be large. The seasonality aspect is a bonus on top the price delta - it just happens that stuff that's in season tends to be in surplus and thus tends to go on sale more frequently during it's seasonality.