Since there is very little info on Canadian unis, sharing my experience for this year.
The deadlines were all early/mid jan (a few remained open till 31st/ Feb 1st). Offers began mid Feb and still going on for many. Seems for Canadian unis there is still hope up until early April.
My background: International student, MA from Canada (expected to end this term). Applied to 5 programs.
McGill: Unofficially rejected on Feb 19th, emailed them to enquire and they replied back. Official rejection came yesterday Mar 7th.
UBC Okanagan Interdisciplinary PhD program (Global Studies): Rejected through portal Feb 28.
Toronto: Unofficially rejected, emailed then and they replied back with this: "as of Tuesday, March 5, I can confirm that everyone who was successful or waitlisted for any of our graduate programs have now been contacted. Those who were not offered are now being contacted this and next week."
UBC: Accepted, offer through email on Mar 5th.
Alberta: Still no news, but I heard they always send after mid Mar.
I can finally breath now with my first offer, coming after 3 rejections. Wishing luck for everyone waiting.