New Jersey Produce Calendar. Ever tried to buy blueberries at a local New Jersey produce market in April, only to find they’re not available? That’s because although blueberries can be found in grocery stores year round, they’re truly in season in the summer, between June and August.We’ve created an in-season produce calendar for New Jersey so you can easily see when it’s the right time to find the freshest asparagus, or if you’ve missed sweet corn season. https://www.farmflavor.com/new-jersey/whats-growing-new-jersey-produce-calendar/