Canadas a huge country and it differs from the long growing seasons in BC to the impossible growing seasons of the far north. It really all depends on where you are in Canada, and the strain you have. In Southern Ontario you usually have a long enough growing season, for most shorter flowering strains. But In the prariers where I live you need auto flowering strains, were probably going to have our first frost in the next week or so.
If your forecast is predicting a hard frost you might want to dig your plant up, and finish the flowering indoors. Getting to your plant and covering and uncovering your plant can be a pain in the ass, and your plant sometimes wont make it.