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Hardiness Zone 9a
USDA hardiness zone 9a has an average coldest winter night of 20 to 25 °F (-7 to -4 °C). On the 2023 map it covers ZIP codes in 13 states, mostly Texas, Louisiana and Florida. Cities in zone 9a include Seattle, WA; Baton Rouge, LA; Mobile, AL.
Average coldest night
20 to 25 °F
-7 to -4 °C
States with zone 9a
13
ZIP codes in zone 9a
2,199
Check your own zone
States in zone 9a
| State | ZIP codes | Share of state |
|---|---|---|
| Texas | 555 | 22% |
| Louisiana | 344 | 48% |
| Florida | 270 | 19% |
| California | 236 | 9% |
| Georgia | 211 | 23% |
| Washington | 137 | 19% |
| Oregon | 115 | 24% |
| Alabama | 87 | 11% |
| Arizona | 67 | 13% |
| South Carolina | 56 | 11% |
| Nevada | 52 | 21% |
| Mississippi | 49 | 9% |
| North Carolina | 20 | 2% |
Cities in zone 9a
Larger places where every ZIP code is zone 9a.
- Seattle, WA
- Baton Rouge, LA
- Mobile, AL
- Tallahassee, FL
- Savannah, GA
- Gainesville, FL
- Charleston, SC
- Lafayette, LA
- Conroe, TX
- Huntsville, TX
- Valdosta, GA
- Alexandria, LA
- Bryan, TX
- Biloxi, MS
- Gulfport, MS
- Beaufort, SC
- College Station, TX
- Round Rock, TX
- Dothan, AL
- Brunswick, GA
- Slidell, LA
- Pascagoula, MS
- Casa Grande, AZ
- Lake City, FL
Zones: 2023 USDA Plant Hardiness Zone Map ZIP code data, USDA Agricultural Research Service and the PRISM Climate Group, Oregon State University (official map). Place names: GeoNames (CC BY 4.0). Each ZIP code gets one zone, but a ZIP code can cross a zone line, and hills, valleys and towns can be warmer or colder than the zone shown.
About the Hardiness Zone Map
The Hardiness Zone Map finds your USDA plant hardiness zone, also called your planting or growing zone, from your ZIP code. Zones are based on the average coldest winter night of the year: each zone is 10 °F wide and split into a and b halves of 5 °F, from zone 1a in Alaska to 13b in Puerto Rico. Plant labels and seed packets give the coldest zone a plant can survive, so knowing your zone tells you which perennials, shrubs and trees can stay outside all winter. Zones come from the official 2023 USDA map ZIP code data for all 50 states, Washington DC and Puerto Rico.
How to use it
- 1 Enter your 5-digit ZIP code and press Find my zone.
- 2 Read your zone and the average coldest winter temperature it stands for.
- 3 Open your state to see its zones and the zone of every city.
- 4 Choose plants rated for your zone number or a colder (lower) one.
Frequently asked questions
What is the lowest temperature in zone 9a?
In zone 9a the coldest night of the year averages 20 to 25 °F (-7 to -4 °C). That is an average over 1991–2020, so a hard winter can go lower.
Which states have zone 9a?
Zone 9a is found in Texas, Louisiana, Florida, California, Georgia, Washington, Oregon, Alabama, Arizona, South Carolina, Nevada, Mississippi and North Carolina.
What is the difference between zone 9a and 9b?
Zone 9b is 5 °F warmer than 9a. Zone 9a has winter lows of 20 to 25 °F, and zone 9b 25 to 30 °F. Plant labels often give only the number, which covers both halves.
What plants grow in zone 9a?
Plants labelled hardy to zone 9 or colder (a lower number) should survive a zone 9a winter. Plants rated only for warmer zones may be damaged by frost unless grown in pots and brought in, or given shelter.
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