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The Sovereign's birthday has been celebrated in Canada since the Reign of Queen Victoria (1837-1901). It was under her Reign that the Dominion of Canada came into existence.  
May 24, Queen Victoria's birthday, was declared a holiday by the Legislature of the Province of Canada in 1845.  
 
After Confederation, the Queen's birthday was celebrated every year on May 24 unless that date was a Sunday, in which case a proclamation was issued providing for the celebration on May 25.  
After the death of Queen Victoria in 1901, May 24th was by imperial decree made Empire Day throughout the British Empire, but In 1958 Empire Day was renamed Commonwealth Day, in accordance with the new post-colonial relationship between the nations of the former empire.  
John Kinder Labatt, founder of John Labatt Ltd was responsible for introducing the idea to Canadians to make Victoria Day a national holiday, and an Act was passed by the Parliament of Canada, establishing a legal holiday on May 24 in each year, (or May 25 if May 24 fell on a Sunday) under the name Victoria Day.  
An amendment to the Statutes of Canada in 1952 established the celebration of Victoria Day on the Monday preceding May 25.  
From 1953 to 1956, the Queen's birthday was celebrated in Canada on Victoria Day, by proclamation of the Governor General, with Her Majesty's approval. In 1957, Victoria Day was permanently appointed as the Queen's birthday in Canada. In the United Kingdom, the Queen's birthday is celebrated in June: they do not celebrate Victoria Day. The province of Alberta, and Lake Louise were named after Queen Victoria’s daughter, Princess Louise Caroline Alberta.  
 
Some places celebrate with fireworks.  
 
Source: http://www.inglewoodcarecentre.com/history/victoria.htm