USDA Plant Hardiness Zone
Zone 11b Frost Dates & Planting Calendar
13 ZIP codes across 3 states fall in zone 11b.
- Zone
- 11b
- Average Annual Low
- 45 to 50°F
- Typical Growing Season
- 333 days
- ZIP Codes
- 13
What zone 11b actually tells you
A hardiness zone describes one thing: the average coldest night of the year, which in zone 11b falls between 45 to 50°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 11b spans 3 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.