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Last Frost Date & USDA Zone by ZIP Code

Find the last spring frost date, first fall frost date, USDA hardiness Zone, and nearest eligible NOAA freeze normals for a five-digit U.S. ZIP code.

Your ZIP stays in this browser.

How the estimate works

USDA ZIP zone joined to Census ZCTA coordinates and the nearest eligible NOAA station by haversine distance.

Worked example

ZIP 02139 returns Zone 6b with spring and fall freeze context from a nearby eligible station.

Assumptions

  • Freeze dates use 32°F probability normals for 1991–2020.

Limitations

  • A hardiness zone is not a planting date.
  • Station distance and missing-data warnings must remain visible.