Iris unguicularis is hardy in these areas:

Alameda, CA	Alamo, CA	American Canyon, CA
Angwin, CA	Antioch, CA	Atwater, CA
Baltimore, MD	Bayside, NY	Bellmore, NY
Bellport, NY	Bethpage, NY	Blue Point, NY
Bohemia, NY	Brentwood, NY	Brightwaters, NY
Bronx, NY	Brookhaven, NY	Brooklyn, NY
Brownsville, TX	Castro Valley, CA	Charlottesville, VA
Chowchilla, CA	Clovis, CA	Coarsegold, CA
College Point, NY	Corona, NY	Cutler, CA
Danville, CA	Del Rey, CA	Dinuba, CA
Dublin, CA	East Elmhurst, NY	El Cerrito, CA
Elmhurst, NY	Essex, CA	Fairfield, CA
Fawnskin, CA	Florence, SC	Flushing, NY
Fontana, CA	Forest Falls, CA	Forest Hills, NY
Fort Eustis, VA	Fremont, CA	Fresh Meadows, NY
Glen Burnie, MD	Greenlawn, NY	Gwynn Oak, MD
Hayward, CA	Holbrook, NY	Holtsville, NY
Hunt Valley, MD	Huntington Station, NY	Huntington, NY
Islandia, NY	Jackson Heights, NY	Jacksonville, FL
Leasburg, NC	Lexington, NC	Liberty, NC
Linwood, NC	Little Neck, NY	Livermore, CA
Ludlow, CA	Luling, LA	Lutcher, LA
Marrero, LA	Martinez, CA	Maspeth, NY
Melville, NY	Memphis, TN	Meraux, LA
Merced, CA	Mercedes, TX	Mi Wuk village, CA
Middle Village, NY	Midpines, CA	Mission, TX
Moccasin, CA	Modesto, CA	Moraga, CA
Moreno Valley, CA	Mount Airy, LA	Napa, CA
New Sarpy, LA	Newark, CA	Newport News, VA
Norco, LA	Nottingham, MD	Oakland Gardens, NY
Oakley, CA	Oakville, CA	Olmito, TX
Orinda, CA	Parkville, MD	Penitas, TX
Pharr, TX	Phelan, CA	Pikesville, MD
Pinole, CA