The Camellia Belt is Zone 8 and 9.  Camellias tend to do well in these areas outdoors.  Some camellias can tolerate zone 7, and even a slight few can grow outdoors in zone 6, but not all of them.  So understand your Camellia needs before planting Camellias in Climate zone 6 and 7.  Zone 10 is usually to warm for most camellias, but there again, there are some than can tolerate the warmer conditions.