The Peak-Season Map at Epicurious allows you to click on each state to find out what's in season and growing there. You can also look ahead, by clicking on the months at the top of the map.
It's not perfect, as here in New York City our local food supply includes at least three states, depending on your definition of "local." Also, the map only covers the major produce categories, so it won't tell you when purslane or salsify is in season. And, we question whether there's really nothing growing in Massachusetts at this time of year, even though all of its neighboring states are producing interesting produce?
Yet it is a far more complete resource than others we've seen. We're also loving the virtual voyage you can take by skipping around the map to find out what far-flung states define as "May produce." Right now, we're tempted to take a trip to Texas for some juicy peaches and plump blackberries.
What's in season in your state?
Related: What's in Season Now: May