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Hardiness Zone 13b
USDA hardiness zone 13b has an average coldest winter night of 65 to 70 °F (18 to 21 °C). On the 2023 map it is found only in Puerto Rico. Cities in zone 13b include Carolina (San Juan), PR; Catano, PR; Ceiba, PR.
Average coldest night
65 to 70 °F
18 to 21 °C
States with zone 13b
1
ZIP codes in zone 13b
26
Check your own zone
States in zone 13b
| State | ZIP codes | Share of state |
|---|---|---|
| Puerto Rico | 26 | 15% |
Cities in zone 13b
Larger places where every ZIP code is zone 13b.
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 13b?
In zone 13b the coldest night of the year averages 65 to 70 °F (18 to 21 °C). That is an average over 1991–2020, so a hard winter can go lower.
Which states have zone 13b?
Zone 13b is found in Puerto Rico.
What is the difference between zone 13a and 13b?
Zone 13b is 5 °F warmer than 13a. Zone 13a has winter lows of 60 to 65 °F, and zone 13b 65 to 70 °F. Plant labels often give only the number, which covers both halves.
What plants grow in zone 13b?
Plants labelled hardy to zone 13 or colder (a lower number) should survive a zone 13b 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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