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Hardiness Zone 11b
USDA hardiness zone 11b has an average coldest winter night of 45 to 50 °F (7 to 10 °C). On the 2023 map it covers ZIP codes in 3 states, mostly Florida, Hawaii and Puerto Rico. Cities in zone 11b include Key West, FL; Big Pine Key, FL; Islamorada, FL.
Average coldest night
45 to 50 °F
7 to 10 °C
States with zone 11b
3
ZIP codes in zone 11b
16
Check your own zone
States in zone 11b
| State | ZIP codes | Share of state |
|---|---|---|
| Florida | 11 | 1% |
| Hawaii | 3 | 2% |
| Puerto Rico | 2 | 1% |
Cities in zone 11b
Larger places where every ZIP code is zone 11b.
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 11b?
In zone 11b the coldest night of the year averages 45 to 50 °F (7 to 10 °C). That is an average over 1991–2020, so a hard winter can go lower.
Which states have zone 11b?
Zone 11b is found in Florida, Hawaii and Puerto Rico.
What is the difference between zone 11a and 11b?
Zone 11b is 5 °F warmer than 11a. Zone 11a has winter lows of 40 to 45 °F, and zone 11b 45 to 50 °F. Plant labels often give only the number, which covers both halves.
What plants grow in zone 11b?
Plants labelled hardy to zone 11 or colder (a lower number) should survive a zone 11b 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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