Reporting
From what we can find, a

From 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