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Hardiness Zone 12a
USDA hardiness zone 12a has an average coldest winter night of 50 to 55 °F (10 to 13 °C). On the 2023 map it covers ZIP codes in 2 states, mostly Hawaii and Puerto Rico. Cities in zone 12a include Aiea, HI; Anahola, HI; Haiku, HI.
Average coldest night
50 to 55 °F
10 to 13 °C
States with zone 12a
2
ZIP codes in zone 12a
30
Check your own zone
States in zone 12a
| State | ZIP codes | Share of state |
|---|---|---|
| Hawaii | 24 | 18% |
| Puerto Rico | 6 | 3% |
Cities in zone 12a
Larger places where every ZIP code is zone 12a.
- Aiea, HI
- Anahola, HI
- Haiku, HI
- Hanalei, HI
- Kalaheo, HI
- Kapaa, HI
- Kualapuu, HI
- Kula, HI
- Kunia, HI
- Kurtistown, HI
- Lawai, HI
- Lihue, HI
- Makawao, HI
- Makaweli, HI
- Mililani, HI
- Papaikou, HI
- Pearl City, HI
- Pukalani, HI
- Schofield Barracks, HI
- Wahiawa, HI
- Waialua, HI
- Waikoloa, HI
- Waipahu, HI
- Wheeler Army Airfield, HI
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 12a?
In zone 12a the coldest night of the year averages 50 to 55 °F (10 to 13 °C). That is an average over 1991–2020, so a hard winter can go lower.
Which states have zone 12a?
Zone 12a is found in Hawaii and Puerto Rico.
What is the difference between zone 12a and 12b?
Zone 12b is 5 °F warmer than 12a. Zone 12a has winter lows of 50 to 55 °F, and zone 12b 55 to 60 °F. Plant labels often give only the number, which covers both halves.
What plants grow in zone 12a?
Plants labelled hardy to zone 12 or colder (a lower number) should survive a zone 12a 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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