Bouscaut's vineyard has existed since the 17th century on the commune of Cadaujac, a Graves appellation at that time. Called Haut Truchon, it was renamed Château Bouscaut after the name on the land register in 1881 .
The various owners throughout the twentieth century were very dedicated to improving and transforming both the vineyard and the château. The neighbouring property, Château Valoux, became part of Bouscaut in 1929. In the thirties, the domain was cited as being a model estate by the Chamber of Agriculture and a race horse called Château Bouscaut won first prize in a coveted Maisons Lafitte race. In the same period, a tower was added to the main residential building and cellars were erected next to it.