Deconstruct SunDelaware Hardiness Zones
Delaware covers USDA plant hardiness zones 7a to 8a on the 2023 map, so its coldest areas average 0 to 5 °F on the coldest winter night. Find your zone by ZIP code, or pick a city below for its zone, sunrise and daylight by month.
Delaware hardiness zone map
Source: USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture, planthardiness.ars.usda.gov. Underlying data © PRISM Group, Oregon State University, prism.oregonstate.edu, accessed 2026-08-30.
Zones and daylight by city
| City | Zone | Coldest night | Longest day | Shortest day |
|---|---|---|---|---|
| Wilmington | 7b | 5 to 10 °F | 14h 59m | 9h 21m |
| Dover | 7b | 5 to 10 °F | 14h 56m | 9h 25m |
| Newark | 7b | 5 to 10 °F | 14h 59m | 9h 22m |
Gardening in Delaware?
Your zone says what survives winter. Deconstruct Sun measures how many hours of direct sun your exact spot gets, so you can pick plants that thrive. Free on iPhone.
Questions
What hardiness zones are in Delaware?
Delaware spans USDA zones 7a to 8a on the 2023 map. Wilmington is in zone 7b.
How do I find my exact zone in Delaware?
Enter your ZIP code in the hardiness zone lookup on this site. It reads the 2023 USDA data for that ZIP and warns you if you are near a zone boundary.
How much sun do gardens in Delaware get?
In Wilmington, an open spot gets up to 15.0 hours of daylight in June but only 9.3 in December. Trees and buildings cut that down, especially in winter. The Deconstruct Sun app measures the real direct-sun hours for one exact spot.