I love love LOVE this map. So useful! Simply click on your state, then choose the month, and it will tell you what produce is at its peak!
http://www.epicurious.com/articlesguides/seasonalcooking/farmtotable/seasonalingredientmap
For Cincinnatians, here is what's available at Findlay:
http://www.findlaymarket.org/harvest-calendar/
