From Bordeaux or Toulouse:

Take the motorway A 62 to Exit 2 (Cadillac-Podensac).
After the toll gate, take Secondary Road D117 towards Cérons/Barsac.
Then, follow Major Road N113 to Barsac.
Drive through Barsac and continue towards Preignac/Langon.
Approximately 800 metres (900 yards) after Barsac, turn right before the bridge and follow the sign "Chai" when passing by the castle.