Zone 11a
In USDA zone 11a the coldest night of an average winter reaches 40 to 45 °F (4.4 to 7.2 °C). 205 ZIP codes (0.5% of all) are in this zone.
Frost dates vary within zone 11a
For the middle half of zone-11a ZIP codes the last spring frost falls between Jan 24 and Apr 12, and the first fall frost between Dec 1 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 11a
Cities mostly in zone 11a
← Zone 10b (colder)Zone 11b (warmer) →
Questions
What is the temperature range of zone 11a?
Zone 11a covers places where the coldest night of an average winter (the annual extreme minimum averaged over 1991–2020) is 40 to 45 °F, or 4.4 to 7.2 °C.
When is the last frost in zone 11a?
Across ZIP codes in zone 11a, the median last spring frost falls between Jan 24 and Apr 12 for the middle half of places. Zone alone doesn't set the frost date — check your ZIP code.
Which states have zone 11a?
Zone 11a occurs in 3 states; the most ZIP codes are in Florida, California, Hawaii.
What can I grow in zone 11a?
Perennials, shrubs and trees labeled hardy to zone 11a 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.