USDA Plant Hardiness Zone ZIP Comparison, 2012 to 2023

Independent ZIP-level comparison by Sprout Authority. It is not an official USDA Plant Hardiness Zone Map and does not alter either source edition.

Published: 2026-08-01
Rows: 41142
SHA-256: 00980eb6c9b63b807855f9c5f4139b37612377336348e849e42345cb70680df4

Columns:
zip_code: five-digit ZIP string, including leading zeroes
zone_2012: official 2012 USDA half-zone listing when present
zone_2023: official 2023 USDA half-zone listing when present
half_zone_change: 2023 minus 2012 in 5-degree-Fahrenheit half-zone steps
comparison_status: unchanged, higher-numbered, lower-numbered, 2012-only, or 2023-only

2012 source and terms: https://prism.oregonstate.edu/phzm/phzm_2012.php
2023 source and terms: https://prism.oregonstate.edu/phzm/
Method: exact five-digit ZIP join. Unmatched ZIPs remain explicit; no zones are inferred.