USDA Plant Hardiness Zone Map
Fuente primaria
USDA Agricultural Research Service and PRISM Climate Group at Oregon State University
The U.S. hardiness-zone reference for average annual extreme minimum temperature, with map graphics, GIS data, and ZIP-code lookup.
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Qué encontrarás aquí
U.S. hardiness zones
ZIP-code zone lookup
Map context
Minimum-temperature caveats
Datos específicos que tomamos de ella: USDA zone, zone version, ZIP-code mapping, map citation.
Bueno saber
Zone caveats. Explain that hardiness zones are winter-minimum guidance, not full planting calendars.
Map attribution. Track whether a page uses official map graphics, raw zone data, or altered derived maps.
Cómo citar esta fuente
Cite the 2023 USDA Plant Hardiness Zone Map and preserve USDA-ARS/OSU attribution when required.
Licencia
USDA map graphics are public-domain U.S. government publications; underlying GIS datasets have attribution and alteration conditions.
Precaución
Do not alter official zone boundaries or derived maps without the required disclaimer and logo handling.
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