It is not just climate. Have you ever looked at the population distribution in Ontario? wonder why Ontarians are all cosied up against the border? Do you know where the viable farmland/grazing might be? 
Yet, maybe you could open a superdairyfarm, with 3000 head of cattle that never set a foot outside a stall to see the light of day, feet rotting in manure, muscles atrophying, utters jacked on hormones. The land is cheap up near Angling Lake.
Oh, and no subsidies.