Here is a pdf file of a great Planting Schedule that I use from Portland Nursery.
This schedule is for the Willamette Valley, so if you are in a different climate zone, you should plan accordingly and alter the dates to coincide with your own last/first frost dates.
Find your PLANT HARDINESS ZONE by zip code here: http://www.garden.org/zipzone/
Order you FREE Territorial Seed Catalog here: http://www.territorialseed.com/
This extraordinary catalog is brimming full with invaluable information on growing fruits & vegetables. A great resource to have in your garden library - IF you can keep the temptation to buy too many wonderful seeds and plants in check and within budget! Did I mention it's FREE?!
Mel Bartholomew's Square Foot Gardening books also have great planting schedule charts. I photocopied the charts, put in my own last/first frost dates and labeled them accordingly for easy reference.
You can be sure to find a copy at your local library.