yes, canadian thanksgiving pre-dates american thanksgiving by a century or so.
as per google:
Long before Europeans settled in North America, festivals of thanks and celebrations of harvest took place in Europe in the month of October. The very first Thanksgiving celebration in North America took place in 1578 in Canada
It is most likely tied to the Festival of Sukkot in Israel. ... sometimes called the Feast of ingathering ... like an Autumn Harvest Festival....