US hardiness zones by state

Most of CT is zone 6b

Connecticut has a classic four-season New England climate with a coastal strip a full zone milder than the inland hills.

Most of DE is zone 7b

Delaware is small and mild, moderated by the Atlantic and Delaware Bay, with a long, productive mid-Atlantic season.

Most of ME is zone 5a

Maine is a short-season cold-climate state, milder along the coast and noticeably colder in the northern and mountain interior.

Most of MD is zone 7b

Maryland spans cool western mountains to a mild Chesapeake tidewater, giving a long, varied mid-Atlantic season.

Most of MA is zone 6b

Massachusetts has a four-season New England climate, with the coast and Cape running a full zone warmer than the western Berkshires.

Most of NH is zone 5b

New Hampshire is a cold New England state with a brief but reliable summer, milder along the small seacoast and colder in the mountains.

Most of NJ is zone 7a

New Jersey has a mild mid-Atlantic climate with a long season, moderated by the ocean and Delaware Bay along the coast.

Most of NY is zone 5b

New York spans cold Adirondack highlands to mild New York City. Most of upstate gardens in zones 5-6; the city and Long Island run much warmer.

Most of PA is zone 6b

Pennsylvania runs from cold northern mountains to a mild southeastern corner. Philadelphia gardens almost two zones warmer than the northern tier.

Most of RI is zone 7a

Rhode Island is small and ocean-moderated, with a long season near the bay and only a slightly cooler interior.

Most of VT is zone 4b

Vermont is a cold, short-season state. The Champlain Valley is the mildest pocket; the mountains and Northeast Kingdom are markedly colder.

Most of DC is zone 8a

Washington, DC sits in a warm mid-Atlantic pocket where the urban heat island pushes much of the city into zone 8a — warmer than the surrounding suburbs.

Most of AL is zone 8a

Alabama has a long, hot, humid growing season with mild winters. Heat and humidity, not cold, are the main limits for most of the state.

Most of AR is zone 7b

Arkansas has a warm, humid, long season with mild winters. The Ozarks run a half zone cooler than the southern lowlands.

Most of FL is zone 9b

Florida is the warmest state in the contiguous US, with subtropical to tropical conditions. The growing constraint is summer heat, humidity, and rain — not cold.

Most of GA is zone 8a

Georgia runs from cool mountains to a warm coastal plain, with a long humid season. Most of the state gardens in zone 8.

Most of KY is zone 6b

Kentucky has a mild four-season climate with a long, humid summer and a winter that rarely tests hardy perennials.

Most of LA is zone 9a

Louisiana is hot, humid, and subtropical with a very long season. Drainage, heat, and humidity drive plant choice far more than cold.

Most of MS is zone 8b

Mississippi has a hot, humid, long season with mild winters. The Gulf Coast is nearly frost-free; the north sees a short cold spell.

Most of NC is zone 7b

North Carolina runs from cool mountains through the Piedmont to a warm coastal plain — one of the widest east-coast zone spans.

Most of SC is zone 8a

South Carolina has a long, hot, humid season with mild winters. The coast is nearly frost-free; the upstate sees a brief cold spell.

Most of TN is zone 7a

Tennessee has a long, humid, warm season with mild winters. The eastern mountains run a zone cooler than the western lowlands.

Most of VA is zone 7b

Virginia runs from cool mountains through the Piedmont to a mild Tidewater, giving a long, varied mid-Atlantic season.

Most of WV is zone 6b

West Virginia is a mountain state where elevation drives the zone. River valleys are mild; the high Alleghenies are noticeably colder.

Most of IL is zone 6a

Illinois has a productive continental Midwest climate. The south of the state runs nearly two half-zones warmer than the Chicago area.

Most of IN is zone 6a

Indiana is a temperate Midwest state with a reliable warm summer and a southern tier that runs a full zone milder than the north.

Most of IA is zone 5b

Iowa has a classic continental prairie climate — cold winters, hot humid summers, and a strong but bounded growing season.

Most of KS is zone 6b

Kansas has a long, hot, often windy continental season. Heat and drought stress matter as much as the winter low across the state.

Most of MI is zone 6a

Michigan is moderated by the Great Lakes, which create a milder fruit belt along Lake Michigan and a colder interior Upper Peninsula.

Most of MN is zone 4b

Minnesota is one of the coldest states in the contiguous US. Cold-hardy varieties and a compressed season define gardening here.

Most of MO is zone 6b

Missouri has a humid continental climate with hot summers and a southeastern Bootheel that gardens nearly a zone warmer than the north.

Most of NE is zone 5b

Nebraska has a continental plains climate — cold winters, hot windy summers, and a season that shortens going north and west.

Most of ND is zone 4a

North Dakota is among the coldest states, with a short season and brutal winters. Cold-hardy, fast-maturing varieties are essential.

Most of OH is zone 6a

Ohio has a temperate, fairly uniform Midwest climate. Most of the state sits in zone 6 with a dependable warm summer.

Most of SD is zone 4b

South Dakota is a cold, windy, short-season plains state. Fast-maturing, cold-hardy varieties are the rule statewide.

Most of WI is zone 5a

Wisconsin is a cold, continental Midwest state, milder along Lake Michigan and considerably colder in the northern interior.

Most of AZ is zone 9a

Arizona ranges from snowy mountain forest to frost-free low desert. In the desert, summer heat is the binding constraint and winter is the prime growing season.

Most of NV is zone 7a

Nevada is a high-desert state with dramatic elevation swings. The southern Mojave is nearly frost-free; the northern basin is cold and short-season.

Most of NM is zone 7a

New Mexico is a high-desert state where elevation, intense sun, and aridity matter as much as the winter low. The south runs much warmer than the mountains.

Most of OK is zone 7b

Oklahoma has a long, hot, often windy season. Summer heat and drought stress are as limiting as the winter low across most of the state.

Most of TX is zone 8b

Texas is huge and spans cold Panhandle plains to a nearly frost-free Gulf and Rio Grande Valley. Most of the state has a long, hot season in zones 8-9.

Most of CO is zone 5b

Colorado gardening is shaped by altitude, intense sun, low humidity, and big day-night temperature swings. Frost can come in any month at high elevation.

Most of ID is zone 6a

Idaho ranges from cold mountain valleys to the mild Treasure Valley. The lower Snake River Plain has the longest, warmest season.

Most of MT is zone 4b

Montana is a cold, short-season state with big elevation effects. Western valleys are milder than the high plains and mountain basins.

Most of UT is zone 6b

Utah ranges from alpine mountains to warm southern desert. Elevation and aridity drive plant choice; the Wasatch Front has the main growing belt.

Most of WY is zone 4b

Wyoming is a high, cold, short-season state. Altitude and wind matter as much as the winter low; frost can come in any summer month at elevation.

Most of AK is zone 4b

Alaska spans the widest zone range of any state, from sub-arctic interior to mild maritime southeast. Season length and summer light, not just cold, shape what grows.

Most of CA is zone 9b

California packs more climate diversity than almost any state — alpine mountains, Mediterranean coast, Central Valley farmland, and desert. Coastal and valley areas grow year-round.

Most of HI is zone 12b

Hawaii is frost-free at sea level and tropical year-round. Elevation, rainfall, and microclimate matter far more than any cold zone.

Most of OR is zone 8b

Oregon is split by the Cascades: a mild, wet, long-season west and a cold, dry, short-season high desert east.

Most of WA is zone 8a

Washington is split by the Cascades into a mild, wet, long-season west and a colder, drier east. The Puget Sound lowland is the mildest belt.