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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: http://www.extension.uidaho.edu/find.asp