Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Zone 9a

In USDA zone 9a the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C). 2,199 ZIP codes (5.4% of all) are in this zone.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
ZIP codes2,199
Typical last frostMar 2
Typical first frostNov 26

Frost dates vary within zone 9a

For the middle half of zone-9a ZIP codes the last spring frost falls between Feb 25 and Mar 11, and the first fall frost between Nov 20 and Dec 2. 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 9a

Texas555 ZIPsLouisiana344 ZIPsFlorida270 ZIPsCalifornia236 ZIPsGeorgia211 ZIPsWashington137 ZIPsOregon115 ZIPsAlabama87 ZIPsArizona67 ZIPsSouth Carolina56 ZIPsNevada52 ZIPsMississippi49 ZIPsNorth Carolina20 ZIPs

Cities mostly in zone 9a

San Antonio, TX82 ZIPsAustin, TX73 ZIPsPortland, OR59 ZIPsSeattle, WA59 ZIPsBaton Rouge, LA41 ZIPsMobile, AL34 ZIPsPensacola, FL23 ZIPsTallahassee, FL19 ZIPsSavannah, GA18 ZIPsGainesville, FL16 ZIPsCharleston, SC13 ZIPsOcala, FL13 ZIPs

← Zone 8b (colder)Zone 9b (warmer) →

Questions

What is the temperature range of zone 9a?

Zone 9a covers places where the coldest night of an average winter (the annual extreme minimum averaged over 1991–2020) is 20 to 25 °F, or −6.7 to −3.9 °C.

When is the last frost in zone 9a?

Across ZIP codes in zone 9a, the median last spring frost falls between Feb 25 and Mar 11 for the middle half of places. Zone alone doesn't set the frost date — check your ZIP code.

Which states have zone 9a?

Zone 9a occurs in 13 states; the most ZIP codes are in Texas, Louisiana, Florida, California, Georgia.

What can I grow in zone 9a?

Perennials, shrubs and trees labeled hardy to zone 9a 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.