Unfortunately, it's not really possible to reliably use a timetable to determine when it's safe to plant anymore. Climate change has drastically shifted the predictability of weather on both coasts in the US in such a short amount of time, even the Master Gardener programs at all the major universities have begun to alter the curriculum to include Defensive Agriculture techniques to combat the massive changes.
Best advice now is to look back at what each month was like over the past few years in your locale, and expect a similar pattern. Start everything indoors, and keep it there until you get a solid week or two of non-frost weather, and stock up on frost and flood protection materials if that's an option. I know some people have been building portable greenhouses in certain areas as well.
Contact your local agriculture extension and get some advice as well (it's free!).