I've done a little bit of digging on the matter, but I'm having difficulty finding anything about voting legislation with regards to Black Canadians.
I'm aware Asians and immigrants were denied entry and/or voting privileges during the early 20th century, but I'm not finding anything else.
I've found a bunch of sources saying it was on the 24th of March 1837, at least for Lower Canada, but none of them tie into usable links, actual documents or even elaborate...