USDA hardiness zone 12b
In zone 12b, the average annual extreme minimum temperature is 55 to 60°F (12.8 to 15.6°C), based on 1991–2020 data from the 2023 USDA Plant Hardiness Zone Map.
Temperature range55 to 60°F12.8 to 15.6°C
ZIP codes137in this half-zone
Major cities1on this site
Typical last frostRare30% risk
What zone 12b means for your garden
A plant labeled "hardy to zone 12b" should survive a typical winter low of 55°F. Tropical and subtropical plants are an option, but many temperate fruit trees may not get enough winter chill. Zone 12a is the colder half of zone 12.
ZIP codes in zone 12b: 95 in Hawaii, 42 in Puerto Rico.
Frost dates in zone 12b
In all 1 major cities in zone 12b, a 32°F frost is rare (NOAA cannot compute frost dates). Gardens here grow year-round; timing is driven by heat and rainfall more than by frost.
Planting calendar for zone 12b
| Crop | Planting windows (frost-free climate) | |||
|---|---|---|---|---|
| Tomato | Jan 15 – Mar 31; Aug 1 – Sep 15 | |||
| Pepper | Feb 1 – Apr 15; Jul 15 – Aug 31 | |||
| Lettuce | Sep 15 – Feb 15 | |||
| Green Beans | Feb 15 – Apr 30; Aug 15 – Sep 30 | |||
| Sweet Corn | Feb 15 – Apr 15; Aug 1 – Aug 31 | |||
| Zucchini & Summer Squash | Feb 15 – Apr 15; Aug 1 – Sep 15 | |||
| Cucumber | Feb 15 – Apr 15; Aug 1 – Sep 15 | |||
| Carrot | Sep 1 – Feb 28 | |||
| Onion | Oct 15 – Jan 15 | |||
| Potato | Jan 1 – Feb 28; Sep 1 – Oct 15 | |||
| Basil | Mar 1 – Jun 30; Aug 15 – Sep 30 | |||
| Spinach | Oct 1 – Feb 15 | |||
| Kale | Sep 1 – Feb 15 | |||
| Broccoli | Sep 1 – Jan 15 | |||
| Peas | Oct 1 – Jan 31 | |||
| Eggplant | Feb 15 – Apr 30; Jul 15 – Aug 31 | |||
| Cabbage | Sep 1 – Jan 31 | |||
| Radish | Sep 15 – Mar 15 | |||
| Strawberry | Oct 1 – Nov 30 | |||
| Beets | Sep 15 – Feb 28 | |||
Cities in zone 12b (1)
Major cities whose center falls in zone 12b:
- Honolulu, HI — frost rare