Here is a link to the first and last frost dates for Canada. You want to plant your seeds right after the frost date and they should finish up before the first frost of the year. I don't know how long your growing season is but an indica strain would probably be better suited for you up there. Just my thoughts. Take care and be safe.
hxxp://www.almanac.com/garden/frostcanada.php
Change the hxxp to http!