Buy the 2015 Old Farmer's Almanac!
From what we can find, aFrom what we can find, a general planting guideline seems to be either March/April as soon as the soil can be worked, or about 2 weeks before last expected spring frost. Choose a short-season variety.   However, we'd suggest calling your county's Cooperative Extension to make sure you get the best information for planting times in your area and elevation. For contact information, see:

Shop Wind Bells in the Almanac General Store