Some schools will offer spring admissions in Canada for what it's worth. From what I've seen spring admits are usually exceptions, where the main cohort of graduate students is admitted in the fall. I could be wrong, but I believe spring admission is generally more for MSc grads who continue on into the PhD, and this avoids having to wait for an extended period between the master's defence and beginning the PhD.
If you think you'll be ready for spring admission, you should contact the school(s) that you're iterested in and discuss whether that's an option for you. Don't expect there to be any competitive advantage though. If there were, I'm sure students would have figured it out a lng time ago.