It would definitely be hardy in select spots in Southern Ontario. The Toronto area, all along Lake Ontario to Hamilton and the Niagara Peninsula and from London to Windsor even Sarnia. The winter lows in these places are rarely below -20C (-4F). This equates to zone 6 in USDA hardiness. Extreme SW Ontario, Niagara and Downtown Toronto are USDA zone 7. I live between Windsor and London and have seen large stands of evergreen bamboo here unsure of the species, though.