Planting Zone by ZIP Code: What Zone Am I In?
Answers: what planting zone am I in?
Data & Methodology Desk
Maintains the climate dataset behind every ZIP lookup, documents each tool’s formula, and reviews every guide’s numbers before publication.
4 guides · 2 tools
Our standards
- Every dataset is cited with its source, vintage and license.
- Every tool formula is published on the methodology page.
- Corrections are logged publicly with a severity level.
- Demo or preview data is always labeled as such.
Sources we rely on most
- NOAA NCEI U.S. Climate Normals 1991–2020
- USDA Plant Hardiness Zone Map (2023)
- US Census Bureau ZIP Code Tabulation Areas
How a guide gets reviewed
- 1Research. Pull the source data and extension or agency guidance.
- 2Write. Answer first, then the reasons and the steps.
- 3Figure check. An editor re-derives every number from its source.
- 4Review. The Data & Methodology Desk signs off.
- 5Re-review. Scheduled each season; changes go in the change log.
Contributors
Named contributors with verifiable credentials will be listed here. This desk publishes as an organization until then.
Tools this desk maintains
Frost Dates by ZIP Code: When Is My Last Frost?
Answers: when is my last frost?
Guides from this desk
Climate & Zones Explainer
Calculator
2023 USDA Hardiness Zone Map Changes: Did Your Zone Change, and Why?
What changed on the 2023 USDA hardiness zone map and why, with the 2012-to-2023 change for 39,899 ZIP codes by state and city.
Climate & Zones Explainer
Calculator
What Is a Last Frost Date? What the 10%, 30%, 50% and 90% Odds Mean
A last frost date is a probability, not a deadline. What NOAA’s 10%, 30%, 50% and 90% dates mean, and a test of how often they held up at 967 airport stations.
Climate & Zones Explainer
Calculator
Frost vs. Freeze: What Each Means, the NWS Alerts and Your Growing Season
Frost is ice on surfaces; a freeze is air at 32°F or colder. NWS alerts explained, and NOAA data on how each threshold changes your growing season.
Climate & Zones Explainer
Calculator
Planting Zone vs Frost Date: What a Hardiness Zone Can and Can’t Tell You
Your zone measures winter’s coldest night; your frost dates time your planting. Across 38,384 ZIP codes, frost dates inside one half-zone still differ by weeks.