USDA Plant Hardiness Zone
Zone 12b Frost Dates & Planting Calendar
98 ZIP codes across 2 states fall in zone 12b.
- Zone
- 12b
- Average Annual Low
- 55 to 60°F
- Typical Growing Season
- 322 days
- ZIP Codes
- 98
What zone 12b actually tells you
A hardiness zone describes one thing: the average coldest night of the year, which in zone 12b falls between 55 to 60°F. It answers whether a perennial will survive the winter — not when to plant in spring.
Frost dates answer the planting question, and they vary widely inside a single zone. Zone 12b spans 2 states, and a coastal ZIP can differ from an inland one by three weeks despite sharing the zone. Pick your own ZIP code below rather than planting by zone alone.