Ontario eh? Hmm.. you guys there have climiate all the way from that of Northern Callifornia Grape farms, to what, 4 months without permafrost at the northern most areas?
Need to know where you are situated. My guess would be, Northern ontario; First couple weeks into October, and soon Ground will start freezing. So you kinda have about 2 weeks left outside.

Southern Ontario; if all is well, You should have light till the end of Oct, but you won't have good daytime temps. so, in that part of Ontario, you should have the other 4/5 weeks of light/warmth outdoors.

Hope it all turns out well, save a good nugg for me. Can't wait to taste it.