According to a coin found in today's Anzberg district, the earliest settlement of the municipal area dates back to the year 79 AD, i.e. to Roman times. From the foundation of the Duchy of Bavaria, the village was Bavarian until 1780. Only with the Peace of Teschen on 13 May 1779 did it become Austrian along with the rest of the Innviertel region and remained so, apart from a brief period during the Napoleonic Wars, until the annexation of Austria by the Third Reich in March 1938. After the end of the Second World War, Freinberg became part of Upper Austria again.