USDA hardiness zone
Zone 12b
Rolled up from the 139 ZIP codes in our data that are classified zone 12b, covering 92 nurseries and garden centers across 9 cities we track in this zone.
Average minimum winter temperature
55°F
Frost
Frost is rare or absent across most of this zone; timing here follows temperature, not a spring/fall frost date. Any single ZIP's own exact frost status is on that ZIP's own lookup page, not approximated here.
Average frost-free growing season
326 days
Average monthly temperature
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 52.4° | 52.2° | 53.1° | 55.1° | 56.5° | 58.9° | 59.8° | 60.3° | 59.5° | 58.6° | 56.1° | 54.1° |
NOAA 1991–2020 Climate Normals, averaged across this zone's member ZIPs.
Crops by frost hardiness
What grows here, and when
Frost is rare or absent here, so cool-season (hardy/semi-hardy) crops typically go in during the cooler months and warm-season (tender/very-tender) crops before the hottest months arrive, rather than on a frost-relative schedule.
Planting windows and crop timing here are computed from USDA/NOAA climate data and the university extension sources cited below, not a site visit or soil test. Treat this as a starting point: local conditions vary, and a local nursery or extension office can advise on your exact site. See our full Disclaimer.
Hardy (49)
- Apple (bare-root fruit tree)
- Apricot (bare-root fruit tree)
- Asparagus
- Bachelor's Button (Cornflower)
- Bare-root rose
- Blackberry
- Blueberry
- Broccoli
- Brussels Sprouts
- Cabbage
- Calendula
- Catnip/Catmint
- Cherry (sweet/tart, bare-root fruit tree)
- Chives
- Collards
- Currant
- Deciduous shade tree (generic, e.g. maple/oak, bare-root or B&B)
- Elderberry
- Evergreen shrub (B&B/potted, e.g. arborvitae, boxwood)
- Flowering deciduous shrub (generic, e.g. lilac/forsythia)
- Garden Peas
- Garlic
- Gooseberry
- Kale
- Kohlrabi
- Larkspur
- Lavender
- Lettuce
- Mint
- Onion (bulb)
- Oregano
- Peach (bare-root fruit tree)
- Pear (bare-root fruit tree)
- Plum (bare-root fruit tree)
- Radish
- Raspberry
- Rhubarb
- Rutabaga
- Sage
- Snapdragon
- Snow Peas
- Spinach
- Strawberry
- Sweet Alyssum
- Sweet Pea
- Table/Bunch Grape
- Tarragon
- Thyme
- Turnip
Semi-hardy (16)
Tender (20)
Zone 12b means an average annual extreme minimum winter temperature of 55°F to 60°F on the 2023 USDA Plant Hardiness Zone Map (USDA/ARS with the PRISM Climate Group at Oregon State University, 1991-2020 records). Every ZIP here carries its zone matched by centroid against the map, not by its polygon boundary, via phzmapi.org's ZIP-level derivation.
The one NOAA station match we hold for this zone reports the same two calendar dates, April 12 and December 1, as both its last spring frost and its first fall frost. That's a single thin station's statistical output, not a real repeating frost season; treat it as a data-coverage artifact rather than a planting deadline, and use the growing-season figure shown above instead.
We track nurseries across zone 12b, all in Hawaii, with Honolulu carrying the most, followed by Waimanalo and Kaneohe.
Cities we track in zone 12b
- Honolulu, HI (50)
- Waimanalo, HI (21)
- Kaneohe, HI (7)
- Captain Cook, HI (5)
- Kapolei, HI (4)
- Waianae, HI (2)
- Ewa Beach, HI (1)
- Kailua, HI (1)
- Kealakekua, HI (1)
Nearby zones
All zones
USDA 2023 Plant Hardiness Zone Map (zone boundaries, via the phzmapi.org ZIP-level derivation) and NOAA 1991–2020 Climate Normals (frost dates, growing season, monthly temperatures).