Hardiness Zones, Gardening Zones, Growing Zones and Plant Zones refer to defined geographic regions that can support specific plants, flowers and trees. The zones define a minimum range of temperatures that a plant or tree can survive safely in that zone. The most commonly used Hardiness Zones were defined by the USDA. The USDA provides a hard copy map that displays these zone throughout the US. The last update to this map covers minimum temperatures from 1961 to 1990. An updated map is currently in production, but has not been released yet. Plant Maps provides the only interactive version of the USDA hardiness zone map available on the internet.
Abies balsamea - balsam fir MapAcer negundo - boxelder MapAcer nigrum - black maple MapAcer pensylvanicum - striped maple MapAcer rubrum - red maple MapAcer saccharinum - silver maple MapAcer saccharum - sugar maple MapAcer spicatum - mountain maple MapAlnus rugosa - speckled alder MapAlnus serrulata - hazel alder MapAmelanchier arborea - downy serviceberry MapAmelanchier sanguinea - roundleaf serviceberry MapBetula alleghaniensis - yellow birch MapBetula lenta - sweet birch MapBetula nigra - river birch MapBetula papyrifera - paper birch MapBetula populifolia - gray birch MapCarpinus caroliniana - American hornbeam MapCarya cordiformis - bitternut hickory MapCarya glabra - pignut hickory MapCarya ovata - shagbark hickory MapCarya tomentosa - mockernut hickory MapCastanea dentata - American chestnut MapCeltis occidentalis - hackberry MapCephalanthus occidentalis - common buttonbush MapChamaecyparis thyoides - Atlantic white cedar MapCornus alternifolia - alternate leaf dogwood MapCornus florida - flowering dogwood MapCornus racemosa - gray dogwood MapCornus rugosa - roundleaf dogwood MapCornus stolonifera - red osier dogwood MapCorylus cornuta - beaked hazel MapFagus grandifolia - American beech MapFraxinus americana - white ash MapFraxinus nigra - black ash MapFraxinus pennsylvanica - green ash MapHamamelis virginiana - witch hazel MapIlex laevigata - smooth winterberry MapIlex verticillata - common winterberry MapJuglans cinerea - butternut MapJuniperus communis - common juniper MapJuniperus virginiana - eastern redcedar MapKalmia latifolia - mountain laurel MapLarix laricina - tamarack MapMyrica pensylvanica - northern bayberry MapNyssa sylvatica - black tupelo MapOstrya virginiana - eastern hophornbeam MapPicea mariana - black spruce MapPicea rubens - red spruce MapPinus resinosa - red pine MapPinus rigida - pitch pine Map
