I found these amazing graphics on Urban Farmer (www.ufseeds.com) and figured this would be best reference on when to start your vegetable garden.
Using the planting schedules below will help you get the most out of your garden. Knowing when to start your seeds, when transplant outdoors, and when to harvest will get the maximum out of your garden.
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Zone 8