Zone 10b
In USDA zone 10b the coldest night of an average winter reaches 35 to 40 °F (1.7 to 4.4 °C). 752 ZIP codes (1.9% of all) are in this zone.
Frost dates vary within zone 10b
For the middle half of zone-10b ZIP codes the last spring frost falls between Jan 24 and Jan 28, and the first fall frost between Dec 11 and Dec 15. The zone measures winter cold, not season length: humid Eastern and dry Western towns in the same zone can be weeks apart. Use your ZIP code for a planting date.
States with zone 10b
Cities mostly in zone 10b
← Zone 10a (colder)Zone 11a (warmer) →
Questions
What is the temperature range of zone 10b?
Zone 10b covers places where the coldest night of an average winter (the annual extreme minimum averaged over 1991–2020) is 35 to 40 °F, or 1.7 to 4.4 °C.
When is the last frost in zone 10b?
Across ZIP codes in zone 10b, the median last spring frost falls between Jan 24 and Jan 28 for the middle half of places. Zone alone doesn't set the frost date — check your ZIP code.
Which states have zone 10b?
Zone 10b occurs in 4 states; the most ZIP codes are in California, Florida, Texas, Hawaii.
What can I grow in zone 10b?
Perennials, shrubs and trees labeled hardy to zone 10b or a lower (colder) number should survive a typical winter. Annual vegetables depend on frost dates rather than zone.
Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.