Maybe in Oregon, or northern California, but most of coastal Oregon, Washington and British Columbis is zone 8. Alice is so right, though, hydrangeas just love that climate! My mother had a hedge of gorgeous blue mop heads.
My friends and family in Vancouver would dispute the zone designation this year - they've had one of the coldest and wettest winters in history this year. Feet of snow, cold rain, high winds, just a terrible winter. The suicide rate rises up there when the winter is especially long and bad, and it's still going on - this weekend is forecast for yet another big wet, cold Pacific storm.