usgrowzones/us-zip-hardiness-zone-changes

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The declared licence (cc-by-4.0) is classified as permissive.

Declared licence: cc-by-4.0, from the tagEvidence: README.md at 2f168e7
Licence files: LICENSE, detected as cc-by-4.0Evidence: LICENSE at 2f168e7
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Citation text from the card

- USDA Plant Hardiness Zone Map, 2012 and 2023. Agricultural Research Service, U.S. Department of Agriculture. https://planthardiness.ars.usda.gov/ — ZIP listings from PRISM Group, Oregon State University, https://prism.oregonstate.edu/phzm/, accessed Oct 2026. OSU retains ownership; data may be freely reproduced and redistributed with attribution, and altered/derived data must carry the "not the official USDA map" disclaimer (above). Terms: https://prism.oregonstate.edu/terms/ and https://planthardiness.ars.usda.gov/pages/map-creation
- NOAA NCEI U.S. Climate Normals 1991–2020 (frost/freeze probability normals). U.S. Government work, public domain in the U.S. https://www.ncei.noaa.gov/products/land-based-station/us-climate-normals
- U.S. Census Bureau: 2024 Gazetteer files, Vintage 2024 population estimates, 2020 ZCTA-to-place relationship file. U.S. Government work, public domain.
- USGS Elevation Point Query Service (3DEP). U.S. Government work, public domain.

Tang, Damon (2026). U.S. ZIP Code Plant Hardiness Zone Changes (2012 → 2023) and City Frost Dates (v1.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.23661628

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stated_licence: "cc-by-4.0"
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