The origins of Route 25 date back to 1947, when the Massachusetts Department of Public Works (MassDPW) announced plans for an expressway that would link I-95 in Foxborough with Cape Cod. The planned route was given the Route 25 designation northwest of a planned interchange with the Fall River Expressway (Route 24) in Raynham and the Route 28 designation to the southeast of Route 24. After ten years of planning studies, the route received preliminary approval from the MassDPW in 1957, and construction began in 1958; the entire route was designated as Route 25 in 1962, with Route 28 instead being aligned on local roads. The portion of the freeway between Route 24 in Raynham and I-195 in Wareham was completed in 1967. In 1969, MassDPW extended the freeway eastward to US 6 in Wareham.