Sorry my dude, but according to this they are.
There are two species of black widow spider in Canada: the western black widow found in parts of BC through to Manitoba (mostly restricted to areas close to the southern Canada-U.S. border) and the northern black widow in southern and eastern Ontario. On occasion, black widow spiders occur outside of their ranges by hitching a ride on produce such as grapes.
No worries, if your heart is in decent shape, you’re actually not in much danger from a black widow, as far as I know. It’s mostly the elderly and the really young who die from their bites these days.