The St. Patrick's Day parade has been held annually in Canada since 1824. The celebration has even taken place during times of war and economic depression. According to some historical records, Montréal has been celebrating St. Patrick's Day even earlier, since at least 1759, the year of the Conquest. Montréal's parade is definitely among the longest-running in North America, along with the New York and Boston parades. It is currently being organized by the United Irish Societies of Montréal and is definitely the biggest highlight of March.
The parade usually runs along St. Catherine Street (when there is no construction taking place). The jovial and costumed procession followed by live music lasts around 2-3 hours. Don't forget to drink your Irish coffee prior to the parade or to grab a beer afterwards at one of the Irish pubs downtown.