District of Columbia planting zones & frost dates
The 1 District of Columbia cities on this site fall in zone 7b.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Washington | 7b | Apr 3 | Nov 2 | 702,250 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.