Andy, try and figure out your average "Last and First Frost Date".
This will give you approximate dates to work backwards from what the seed pack says, and a season length which is important to know so that you can choose the proper variety for your microclimate.
One good website is wunderground.com. you can input your location, and find local folks who have a "Personal Weather Station". You can even map them to get a good sense of your local climate if you're lucky. They usually have customizable tables, some graphable over time, which is cool.

Plant what you want to eat and/or preserve.
Dried beans have amazing varieties.

We've found we love to eat beets, collards, winter squash, grilled green peppers and shallots and garlic goes nuts.

Gardening is good stuff, and its been on my mind lately:

YOu can get garlic and shallots in now, and spinach under a row cover (bent pvc with painters plastic is perfect).
Next month plant potatoes and peas every two weeks for 6 weeks.
By then you can probably plant out your tenders (tomatoes, peppers, eggplant) and sow your green beans, cabbages, brussels sprouts, leeks, more beets and greens.
maybe wait til the soils warm to plant your corn and melons.