The 13th Parliament of Upper Canada was opened 8 November 1836.
The House of Assembly had five sessions 8 November 1836 to 10 February 1840.
In the election campaign of June 1836, the Lieutenant Governor Sir Francis Bond Head appealed to the United Empire Loyalists of the colony, proclaiming that the reformers were advocating American republicanism.
The Conservative party, led by the wealthy landowners known as the "Family Compact", won the election resulting in a conservative majority in the legislative assembly and triggering dissent in the province.
The Act of Union 1840 abolished the legislative assemblies for Upper and Lower Canada and created a new Province of Canada with a common Legislative Assembly.