The municipality of Aasgaard was established on 1 May 1895 when it was separated from Stangvik. It had an initial population of 629. On 1 July 1915 a southern district of Halsa Municipality (population: 114) was transferred to Aasgaard. The spelling was later changed to Åsskard. On 1 January 1965, Åsskard was incorporated into the neighboring Surnadal Municipality to the south. Before the merger, Åsskard had a population of 1,014.