Due to the cool September and October,here ,this year,JH Adriatic did not ripe ,most of fruits this year,only a few got ripe,so in a colder zone the cultivar can be late in ripening.
It seem hardy,but my tree is not old enough,to live it without protection,so I am not prepared to say it is hardy,in colder than 7 zone ,at this time, and not sure thing,to be planted in ground outside.
My Ronde de Bordeaux is also too young to judge if it is as hardy as Marseilles black vs ,or Florea,at this point in time.I know it is hardy,but how hardy,only time will tell.