These are my two favourite markets to go to in Queens (Astoria, specifically).
Does it seem crazy that they run until November? It that a normal market-ending time? I'm not complaining, but that seems too great to be true.
Anyway, no big lectures here. You're either into supporting local farmers or y'aint. And most of the year - I don't really care to, to be honest. But if you cook a lot, then it makes sense to take advantage of the crazy fresh stuff at these kinds of markets during at least the summer months.