Victoria Day is a federal Canadian public holiday celebrated on the last Monday preceding May 25, in honour of Queen Victoria‘s birthday. As such, it is the Monday between the 18th to the 24th inclusive, and thus is always the penultimate Monday of May. The date is simultaneously that on which the current Canadian sovereign‘s official birthday is recognized. It is sometimes informally considered the beginning of the summer season in Canada.
The holiday has been observed in Canada since at least 1845, originally falling on Victoria’s actual birthday (24 May 1819).