USDA Plant Hardiness Zone
Zone 13a Frost Dates & Planting Calendar
70 ZIP codes across 2 states fall in zone 13a.
- Zone
- 13a
- Average Annual Low
- 60 to 65°F
- Typical Growing Season
- 365 days
- ZIP Codes
- 70
What zone 13a actually tells you
A hardiness zone describes one thing: the average coldest night of the year, which in zone 13a falls between 60 to 65°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 13a 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.