Im in south ontario too, and i think they wont be done before the frost! Im planning to crop in mid-october, im just starting to get trichomes forming, no hairs have started to change at all, a good month to go.
In a month, we'll make another thread like this where all ontario growers post weight dry and wet if you want, height of plant, and how many girls you harvested or something with pictures of the buds.
Some people may crop in 2-3 weeks but i plan to have mine going for 4-5 to get maximum bud taste out of them since i only have 2 mothers.