District of Columbia falls entirely within USDA hardiness zone 8a, according to the 2023 USDA Plant Hardiness Zone Map, one of the more spatially uniform areas on the map.
This is a regional estimate based on the nearest of 826 reference points, each matched to the official 2023 USDA zone map. It’s accurate to within about a half-zone across most of the country, but elevation shifts zones over short distances, so if you’re in mountainous terrain, check the official USDA map for your exact address (see Sources below).
District of Columbia's USDA Hardiness Zones
Here's how the zone shifts across District of Columbia's major cities:
Because District of Columbia sits in a single zone, frost dates are consistent statewide:
Zone 8: average last frost Mar 8 - Mar 22, average first frost Nov 8 - Nov 22.
These are averages, not guarantees. For your specific frost window, use the Frost Date Calculator. For a full vegetable-by-vegetable planting calendar already calculated from District of Columbia's frost dates, see the District of Columbia Planting Calendar.
The District is small enough to fall entirely within a single USDA zone, but a 2018 NOAA/Climate.gov citizen-science heat-mapping project found up to a 16F temperature spread across D.C. neighborhoods on the same summer afternoon, driven by the urban heat island effect rather than elevation or latitude.
What Grows Well in District of Columbia's Zones
A few real, zone-appropriate picks recommended by University of Maryland Extension for District of Columbia landscapes: not an exhaustive list, but a genuine starting point.
Eastern redbud (Cercis canadensis)
Flowering dogwood (Cornus florida)
Inkberry holly (Ilex glabra)
Virginia sweetspire (Itea virginica)
Little bluestem (Schizachyrium scoparium)
Ready to find your exact zone? Use the Hardiness Zone Finder: enter your ZIP code for a precise match against the 2023 USDA map.
District of Columbia Growing Zone FAQ
What growing zone is District of Columbia in?
District of Columbia is in USDA hardiness zone 8a on the 2023 USDA Plant Hardiness Zone Map.
What growing zone is Washington, DC?
Washington is in USDA hardiness zone 8a on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
Plants that suit District of Columbia: eastern redbud, flowering dogwood and inkberry holly. AI-generated image.
