Delaware has 3 USDA hardiness zones from 7a to 8a, with average winter lows from 0°F in northern New Castle County to 15°F along coastal Sussex County, per the 2023 USDA Plant Hardiness Zone Map.
Delaware’s coldest zone 7a appears in northern New Castle County with 0°F to 5°F lows, spanning Newark, Hockessin, Pike Creek, Pike Creek Valley, and North Star at zones 7a–7b.
Central and southern Delaware span zone 7b with 5°F to 10°F lows: Wilmington at zone 7b in New Castle County, Dover at zone 7b in Kent County, Middletown, Smyrna, Seaford, Georgetown, and Milford at zone 7b.
Warmest zone 8a reaches 10°F to 15°F lows along Sussex County’s coastline: Lewes, Rehoboth Beach, Bethany Beach, Dewey Beach, Henlopen Acres, and South Bethany at zone 8a, plus Long Neck, Millville, and Ocean View at zones 7b–8a.
Delaware’s hardiness zones are also called growing zones, planting zones, plant zones, gardening zones, USDA zones, or climate zones.
Use the county and city lists below, search by ZIP code, or open the interactive Delaware planting zones map for precise USDA zone locations.
Delaware Planting Zones by ZIP Code
Delaware Planting Zones Map
Planting Zones
Planting Zones
USDA Hardiness Zones for Delaware Counties
| Delaware Counties | Hardiness Zones |
|---|---|
| Kent County | Zone 7b and 8a |
| New Castle County | Zone 7a, 7b and 8a |
| Sussex County | Zone 7b and 8a |
USDA Hardiness Zones for Delaware Cities and Towns
| Delaware City/Town | 2023 USDA Hardiness Zone(s) |
|---|---|
| Arden | Zone 7b |
| Ardencroft | Zone 7b |
| Ardentown | Zone 7b |
| Bear | Zone 7b |
| Bellefonte | Zone 7b |
| Bethany Beach | Zone 8a |
| Bethel | Zone 7b |
| Blades | Zone 7b |
| Bowers | Zone 7b |
| Bridgeville | Zone 7b |
| Brookside | Zone 7b |
| Camden | Zone 7b |
| Cheswold | Zone 7b |
| Clayton | Zone 7b |
| Dagsboro | Zone 7b |
| Delaware City | Zone 7b |
| Delmar | Zone 7b |
| Dewey Beach | Zone 8a |
| Dover | Zone 7b |
| Dover Base Housing | Zone 7b |
| Edgemoor | Zone 7b |
| Ellendale | Zone 7b |
| Elsmere | Zone 7b |
| Farmington | Zone 7b |
| Felton | Zone 7b |
| Frankford | Zone 7b |
| Frederica | Zone 7b |
| Georgetown | Zone 7b |
| Glasgow | Zone 7b |
| Greenville | Zone 7b |
| Greenwood | Zone 7b |
| Harrington | Zone 7b |
| Hartly | Zone 7b |
| Henlopen Acres | Zone 8a |
| Highland Acres | Zone 7b |
| Hockessin | Zone 7a and 7b |
| Houston | Zone 7b |
| Kenton | Zone 7b |
| Laurel | Zone 7b |
| Leipsic | Zone 7b |
| Lewes | Zone 8a |
| Little Creek | Zone 7b |
| Long Neck | Zone 7b and 8a |
| Magnolia | Zone 7b |
| Middletown | Zone 7b |
| Milford | Zone 7b |
| Millsboro | Zone 7b |
| Millville | Zone 7b and 8a |
| New Castle | Zone 7b |
| Newark | Zone 7a and 7b |
| Newport | Zone 7b |
| North Star | Zone 7a and 7b |
| Ocean View | Zone 7b and 8a |
| Odessa | Zone 7b |
| Pike Creek | Zone 7a and 7b |
| Pike Creek Valley | Zone 7a and 7b |
| Rehoboth Beach | Zone 8a |
| Rising Sun-Lebanon | Zone 7b |
| Riverview | Zone 7b |
| Seaford | Zone 7b |
| Selbyville | Zone 7b |
| Slaughter Beach | Zone 7b |
| Smyrna | Zone 7b |
| South Bethany | Zone 8a |
| St. Georges | Zone 7b |
| Townsend | Zone 7b |
| Viola | Zone 7b |
| Wilmington | Zone 7b |
| Wilmington Manor | Zone 7b |
| Woodside | Zone 7b |
| Wyoming | Zone 7b |