you want to grow them when you have the most sun. i'm pretty close to you (ny) so june,july,august months. these plants need alot of sun. if started early march/april or late aug/sept the yeild will be smaller due to lack of sun!

it's awsome though, that you can start these in june and harvest early august. or run a spring, summer, and fall crop if you dont mind the small yeild in spring/fall. either way a great supplement for your grow season.
don't have to buy weed until harvest so your basically set year round!

peace!