What temperature range is USDA zone 10b?

Zone 10b covers areas whose average annual extreme minimum winter temperature is 35 to 40 °F. Each numbered zone is a 10°F band; the "a" and "b" half-zones split it into 5°F steps.

Does zone 10b 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 10b to see its frost calendar and per-crop planting windows.

What can I grow in zone 10b?

Almost any common vegetable can be grown in zone 10b; 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 10b — frost dates & what to plant

USDA hardiness zone 10b

Average annual extreme minimum temperature: 35 to 40 °F

USDA plant hardiness zone 10b covers areas whose average annual extreme minimum winter temperature is 35 to 40 °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. 64 locations on this site fall in zone 10b (Anaheim, CA, Avalon, CA, Belleair, FL, Bonita Springs, FL, Cape Coral, FL, Carlsbad, CA, Chula Vista, CA, Coral Springs, FL, and 56 more); open one to see its frost dates, growing-season length, and a printable per-crop planting calendar.

Locations in zone 10b — 60 of 64

Same zone, different frost calendars — open one for its full planner. A spread across the zone is shown; browse a state for its full list.
Location	Last frost	First frost	Season (days)
Anaheim, CA	frost-free	frost-free	365
Avalon, CA	frost-free	frost-free	365
Belleair, FL	Jan 20	Jan 9	354
Bonita Springs, FL	frost-free	frost-free	365
Cape Coral, FL	frost-free	frost-free	365
Carlsbad, CA	frost-free	frost-free	365
Chula Vista, CA	frost-free	frost-free	365
Coral Springs, FL	frost-free	frost-free	365
Daly, CA	frost-free	frost-free	365
Daly, CA	frost-free	frost-free	365
Davie, FL	frost-free	frost-free	365
Eastern Goleta Valley, CA	Jan 11	Dec 16	342
Emeryville, CA	frost-free	frost-free	365
Everglades, FL	frost-free	frost-free	365
Florida, FL	frost-free	frost-free	365
Fort Hunter Liggett, CA	Feb 13	Dec 27	323
Grove, FL	frost-free	frost-free	365
Hobe Sound, FL	frost-free	frost-free	365
Honokaa, HI	frost-free	frost-free	365
Irvine, CA	frost-free	frost-free	365
Jupiter, FL	frost-free	frost-free	365
Kendale Lakes, FL	frost-free	frost-free	365
Laguna Vista, TX	frost-free	frost-free	365
Long Beach, CA	frost-free	frost-free	365
Longboat Key, FL	frost-free	frost-free	365
Los Angeles, CA	frost-free	frost-free	365
Los Angeles, CA	frost-free	frost-free	365
Los Angeles, CA	Jan 2	Dec 26	364
Los Angeles, CA	frost-free	frost-free	365
Los Angeles, CA	frost-free	frost-free	365
Naples, FL	frost-free	frost-free	365
Newport Beach, CA	frost-free	frost-free	365
Oxnard, CA	frost-free	frost-free	365
Palm Beach Gardens, FL	frost-free	frost-free	365
Pasadena, CA	frost-free	frost-free	365
Pembroke Pines, FL	frost-free	frost-free	365
Plantation Island, FL	frost-free	frost-free	365
Pompano Beach, FL	frost-free	frost-free	365
Port Hueneme, CA	frost-free	frost-free	365
Rancho Mission Viejo, CA	Jan 28	Dec 18	329
Ridgecrest, FL	frost-free	frost-free	365
Rosemead, CA	frost-free	frost-free	365
Rotonda, FL	frost-free	frost-free	365
San Clemente, CA	frost-free	frost-free	365
San Clemente, CA	frost-free	frost-free	365
San Diego, CA	Jan 6	Dec 21	350
San Diego, CA	frost-free	frost-free	365
San Diego, CA	frost-free	frost-free	365
San Diego, CA	frost-free	frost-free	365
Santa Barbara, CA	frost-free	frost-free	365
Silverado, CA	frost-free	frost-free	365
South Miami Heights, FL	frost-free	frost-free	365
St. Petersburg, FL	frost-free	frost-free	365
Stuart, FL	frost-free	frost-free	365
Tamiami, FL	frost-free	frost-free	365
Temecula, CA	frost-free	frost-free	365
Thousand Oaks, CA	Jan 24	Dec 15	329
Thousand Oaks, CA	frost-free	frost-free	365
Wellington, FL	frost-free	frost-free	365
West Palm Beach, FL	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 10b means for your garden

A plant rated "hardy to zone 10b" can be expected to survive a winter whose coldest night lands in the 35 to 40 °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 10b?: Zone 10b covers areas whose average annual extreme minimum winter temperature is 35 to 40 °F. Each numbered zone is a 10°F band; the "a" and "b" half-zones split it into 5°F steps.
Does zone 10b 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 10b to see its frost calendar and per-crop planting windows.
What can I grow in zone 10b?: Almost any common vegetable can be grown in zone 10b; 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.