Sarah mentioned that some studies show that British shoppers are clueless about seasonal produce. I think it's a fair bet that many people, in many countries are similarly unaware of the prime season for at least one fruit or vegetable. Without getting into the various issues surrounding why it is or is not best to buy seasonal (local) produce, there are two ways to figure out what's in season quickly.
First, you can visit a local farmer's market. You'll be able to find fruits and veggies at the peak of their season without too much problem. Stock up on things that freeze well, like berries, so you don't have to worry about seasonality when you get a craving.
The second way is a little more fun.
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