Havukkakallio hillfort was first mentioned in archeological literature in the late 1800s. The first archaeological excavations, led by archaeologist Jouko Voionmaa, took place almost 100 years later, between 1961 and 1963. Despite extensive excavations, however, only two artefacts were found – a hunting spear and a harpoon - neither of which could be reliably dated. No research report was ever written and, despite Voionmaa's investigations, the history of Havukkakallio remained a mystery.
In 2021, Havukkakallio at last began revealing its secrets. Excavations conducted by archeologists Ville Laakso and Jasse Tiilikkala unearthed several pieces of burnt and unburnt wood inside one of the ancient fort's wall mounds. Radiocarbon dating has revealed these pieces of wood, which may be remains of the fort's walls, date from between the 1300s and 1500s. These remarkable findings are of great scientific and cultural value. For the first time, the usage of the hillfort can now be reliably dated.