Camellia sinensis is hardy in these areas:

Alameda, CA	Alamo, CA	American Canyon, CA
Angwin, CA	Antioch, CA	Baltimore, MD
Bayside, NY	Bronx, NY	Brooklyn, NY
Brownsville, TX	Canton, MI	Charlottesville, VA
College Point, NY	Corona, NY	Danville, CA
Detroit, MI	Dublin, CA	East Elmhurst, NY
East Greenville, PA	East Texas, PA	Easton, PA
Ecorse, MI	El Cerrito, CA	Elmhurst, NY
Emmaus, PA	Essex, CA	Fairfield, CA
Fawnskin, CA	Ferndale, MI	Florence, SC
Flushing, NY	Fontana, CA	Forest Falls, CA
Forest Hills, NY	Fort Eustis, VA	Fremont, CA
Fresh Meadows, NY	Glen Burnie, MD	Gwynn Oak, MD
Hamtramck, MI	Harper Woods, MI	Harrison Township, MI
Highland Park, MI	Hunt Valley, MD	Jackson Heights, NY
Leasburg, NC	Lexington, NC	Liberty, NC
Linwood, NC	Little Neck, NY	Ludlow, CA
Macomb, MI	Marysville, MI	Maspeth, NY
Memphis, MI	Mercedes, TX	Middle Village, NY
Mission, TX	Modesto, CA	Moreno Valley, CA
Morgantown, WV	Mount Clemens, MI	New Baltimore, MI
New Haven, MI	New York, NY	Newark, CA
Newport News, VA	North Street, MI	Nottingham, MD
Oakland Gardens, NY	Oakley, CA	Oakville, CA
Olmito, TX	Orinda, CA	Parkville, MD
Penitas, TX	Pharr, TX	Phelan, CA
Philadelphia, PA	Pikesville, MD	Pinole, CA
Pinon Hills, CA	Pittsburg, CA	Pleasanton, CA
Pope Valley, CA	Port Costa, CA	Port Isabel, TX
Progreso, TX	Redlands, CA	Rego Park, NY
Rialto, CA	Ridgewood, NY	Rimforest, CA
River Rouge, MI	Rosedale, MD	Saratoga, CA
Soquel, CA	Sparrows Point, MD	Staten Island, NY
Taylor, MI