USDA Plant Hardiness Zone
Zone 7b Frost Dates & Planting Calendar
2,888 ZIP codes across 31 states fall in zone 7b.
- Zone
- 7b
- Average Annual Low
- 5 to 10°F
- Typical Growing Season
- 201 days
- ZIP Codes
- 2,888
What zone 7b actually tells you
A hardiness zone describes one thing: the average coldest night of the year, which in zone 7b falls between 5 to 10°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 7b spans 31 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.