All states › Zone 9b
USDA Hardiness Zone 9b
Zone 9b on the 2023 USDA Plant Hardiness Zone Map means an average annual extreme minimum temperature of 25°F to 30°F, averaged over 1991 to 2020. The zone is about the coldest winter night, not frost dates or summer heat, so towns in the same zone can have different frost dates.
Towns in zone 9b
- TucsonZone 9b, median last frost Feb 5
- MesaZone 9b, median last frost Feb 1
- GilbertZone 9b, median last frost Feb 1
- Elk GroveZone 9b, median last frost Feb 2
- Santa RosaZone 9b, median last frost Feb 25
- ConcordZone 9b, median last frost Mar 8
- VacavilleZone 9b, median last frost Feb 18
- NapaZone 9b, median last frost Feb 12
- DublinZone 9b, median last frost Feb 15
- DavisZone 9b, median last frost Feb 10
- JacksonvilleZone 9b, median last frost Feb 25
- HendersonZone 9b, median last frost Jan 20