Okay. I am not sure you know farmer's markets exist in places other than California or that California makes up less than 12% of the nation's population.
Most farmer's markets don't exist in California, but they do sell produce from California. Some do, some don't which is a problem and the thrust/genesis of my comment on the article.
The entire point really is that certain places, like California, have a wide variety of produce year-round. But for most of the country, this local produce is not widely available, so it's important to ensure that if you are going to a farmer's market somewhere other than California, you aren't buying produce from California.
That means you need to be aware of what is and is not in season for where you live.
(To help you with the math, again, that is NOT California, for 88% of the population of the United States or roughly 295 million people.)
Since you are from California, the only definition of the word "season" you might be familiar with is for Hollywood TV shows. But another much, much, much older definition of "season," which the rest of us know about, is when farmers play a high-stakes game of "Will It Grow?" where they bet everything on whether their plants will survive the weather’s mood swings. It’s nature's version of a reality TV show, but it involves culverts, not Culver City, and has more dirt and less sex, but it still has lots of drama and sometimes heartbreak and tears, and also costs millions of dollars to produce each season.
But even in California, if someone is trying to sell you cranberries in June at a "farmer's market," you might want to think about the last time you saw a farmer around you growing cranberries.
Seriously, what is it about people from California that they need to be constantly reminded that most of the country does not live in California? I know it's crowded there, and the traffic sucks, and real estate is expensive, but no, that's not us, we have not all moved there, and I don't think most of us are ever planning on it.