Château de Saint Cosme Gigondas Le Poste is from a 1-hectare terraced vineyard that sits near the chapel of Saint Cosme, a short uphill climb from the winery. The maximum elevation is 280 meters, 140 meters above the Gigondas valley floor, and is one of the coolest vineyards in Gigondas. The terraces and elevation make it necessary to plow the vineyard by horse.

The vineyard was replanted in 1963 by Henri Barruol to a field blend based mainly on Grenache and one small parcel of Clairette from which Le Poste Blanc is produced. The wine is made with whole cluster fermentation from indigenous yeasts, aged in 20% new 228-liter barrels, and bottled without fining or filtering. Only six barrels are produced each year.