Epicurious has created a fun and useful map of the US with information about what foods are seasonal and fresh in your state by the month. All you have to do is go there and click on the month and your state - VOILA! you find out what you can eat that hasn't been sitting around for months. And what should be the best price in your area as well.
From the article:
I hope that you enjoy making new stuff with your new ingredients.