This is it, according to the USDA. A good time to remember to get to your closest market, and see what's in season - if you don't have a garden that lets you know.
And before you complain that farmers' market produce is more expensive, consider two things:
Much of the food available at the supermarket and in fast food outlets, which is based on commodity crops, may appear cheaper, but that's because it's subsidized. Your taxes help to pay the difference. And your increased health care costs pay some of the remainder.
More and more farmers' markets here in California are accepting CalFresh (our version of SNAP, which used to be food stamps) at a 2 for 1 rate - $10 of CalFresh benefit will buy $20 worth of farmers' market produce. For many items, this makes the cost less than supermarket produce.