USDA Plant Hardiness Zone
Zone 2a Frost Dates & Planting Calendar
20 ZIP codes across 1 states fall in zone 2a.
- Zone
- 2a
- Average Annual Low
- -50 to -45°F
- Typical Growing Season
- 104 days
- ZIP Codes
- 20
What zone 2a actually tells you
A hardiness zone describes one thing: the average coldest night of the year, which in zone 2a falls between -50 to -45°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 2a spans 1 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.