An important part of buying local is making an effort to purchase fresh fruits and vegetables when they are in season in your area. Although today's global marketplace allows us to buy foods grown virtually anywhere in the world all year round, these options are not the most sustainable.
By purchasing local foods in-season, you eliminate the environmental damage caused by shipping foods thousands of miles, your food dollar goes directly to the farmer, and your family will be able to enjoy the health benefits of eating fresh, unprocessed fruits and vegetables. Buying seasonal produce also provides an exciting opportunity to try new foods and to experiment with seasonal recipes. And it simply tastes better!
Check out http://www.sustainabletable.org for more on local sustainable food.