Due to its proximity to the Gironde estuary, none of the vines were impacted by frost in 2017 at Cos d’Estournel. Flowering took place on May 22, which was exceedingly early. In June, there were early signs of water stress, and the vines were slowing down and sluggish, according to technical director Dominique Arangoïts. But the vines at this vineyard are now coming in at an average age of 55 years old, which suggests they are capable of managing a bit of water stress. Thankfully, by the end of June, there was enough rain to reinvigorate the vines. This hydric stress appears to have equated to the formation of relatively small, thick-skinned berries in 2017. Thanks to the early flowering, it was an early start to the harvest: September 12. Harvest continued through until the end of the month.