After a premature few summery days in early April, there have been several frosty nights in most of France damaging plants which had budded happily included the hydrangeas in my garden. Here is a link to an article in French with a useful map of the areas affected http://www.lefigaro.fr/sciences/2017/04 ... le-gel.php .
As far as I can tell the Rhône valley seems OK as well as Roussillon and Provence. Bordeaux châteaux close to the Gironde estuary were less badly affected than those further inland. Watch the prices of '14, '15 and '16 now escalate. BTW there are reports of excellent quality of the last from most regions.