What temperature range is USDA zone 12b?

Zone 12b covers areas whose average annual extreme minimum winter temperature is 55 to 60 °F. Each numbered zone is a 10°F band; the "a" and "b" half-zones split it into 5°F steps.

Does zone 12b tell me when to plant?

No — the hardiness zone tells you which perennials survive winter, not when to sow annual vegetables. Planting dates depend on your local last and first frost, which can vary within a single zone. Open one of the sample locations in zone 12b to see its frost calendar and per-crop planting windows.

What can I grow in zone 12b?

Almost any common vegetable can be grown in zone 12b; what changes with zone and local climate is the timing and the length of the season. Cold-hardy crops (peas, spinach, lettuce) go out earliest, tender crops (tomatoes, peppers, basil) after the last frost. Use each location's calendar for exact dates.

USDA hardiness zone 12b — frost dates & what to plant

USDA hardiness zone 12b

Average annual extreme minimum temperature: 55 to 60 °F

USDA plant hardiness zone 12b covers areas whose average annual extreme minimum winter temperature is 55 to 60 °F — the standard USDA measure of which perennials survive an average winter. Hardiness zone sets winter survival, but planting DATES depend on your local frost calendar, which varies within a zone. 26 locations on this site fall in zone 12b (Anahola, HI, Discovery Harbour, HI, East Honolulu, HI, Fern Forest, HI, Hawaiian Paradise Park, HI, Hawi, HI, Honaunau-Napoopoo, HI, Kahului, HI, and 18 more); open one to see its frost dates, growing-season length, and a printable per-crop planting calendar.

Locations in zone 12b

Same zone, different frost calendars — open one for its full planner.
Location	Last frost	First frost	Season (days)
Anahola, HI	frost-free	frost-free	365
Discovery Harbour, HI	frost-free	frost-free	365
East Honolulu, HI	frost-free	frost-free	365
Fern Forest, HI	frost-free	frost-free	365
Hawaiian Paradise Park, HI	frost-free	frost-free	365
Hawi, HI	frost-free	frost-free	365
Honaunau-Napoopoo, HI	frost-free	frost-free	365
Kahului, HI	frost-free	frost-free	365
Kailua, HI	frost-free	frost-free	365
Kaloko, HI	frost-free	frost-free	365
Kaumakani, HI	frost-free	frost-free	365
Kihei, HI	frost-free	frost-free	365
Kilauea, HI	frost-free	frost-free	365
Kualapuu, HI	frost-free	frost-free	365
Lanai, HI	frost-free	frost-free	365
Laupahoehoe, HI	frost-free	frost-free	365
Mahinahina, HI	frost-free	frost-free	365
Makakilo, HI	frost-free	frost-free	365
Pahala, HI	frost-free	frost-free	365
Ponce, PR	frost-free	frost-free	365
Punaluu, HI	frost-free	frost-free	365
Urban Honolulu, HI	frost-free	frost-free	365
Urban Honolulu, HI	frost-free	frost-free	365
Waianae, HI	frost-free	frost-free	365
Waimea, HI	frost-free	frost-free	365
Wainiha, HI	frost-free	frost-free	365

Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.

What zone 12b means for your garden

A plant rated "hardy to zone 12b" can be expected to survive a winter whose coldest night lands in the 55 to 60 °F range — the metric the USDA map is built on. That governs perennials, shrubs, and trees. For annual vegetables, what matters is the frost calendar: the dates of the average last spring and first fall freeze, which set when it is safe to plant and how long the season runs. Those come from the individual location pages above.

Zones are from the USDA Plant Hardiness Zone Map 2023, matched to each location's ZIP — see the methodology page. Browse all hardiness zones or crop-by-crop timing.

Frequently asked questions

What temperature range is USDA zone 12b?: Zone 12b covers areas whose average annual extreme minimum winter temperature is 55 to 60 °F. Each numbered zone is a 10°F band; the "a" and "b" half-zones split it into 5°F steps.
Does zone 12b tell me when to plant?: No — the hardiness zone tells you which perennials survive winter, not when to sow annual vegetables. Planting dates depend on your local last and first frost, which can vary within a single zone. Open one of the sample locations in zone 12b to see its frost calendar and per-crop planting windows.
What can I grow in zone 12b?: Almost any common vegetable can be grown in zone 12b; what changes with zone and local climate is the timing and the length of the season. Cold-hardy crops (peas, spinach, lettuce) go out earliest, tender crops (tomatoes, peppers, basil) after the last frost. Use each location's calendar for exact dates.