Deconstruct SunDistrict of Columbia Hardiness Zones
District of Columbia covers USDA plant hardiness zones 7b to 8a on the 2023 map, so its coldest areas average 5 to 10 °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.
District of Columbia 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 |
|---|---|---|---|---|
| Washington | 8a | 10 to 15 °F | 14h 54m | 9h 26m |
Gardening in District of Columbia?
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 District of Columbia?
District of Columbia spans USDA zones 7b to 8a on the 2023 map. Washington is in zone 8a.
How do I find my exact zone in District of Columbia?
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 District of Columbia get?
In Washington, an open spot gets up to 14.9 hours of daylight in June but only 9.4 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.