Delaware planting zones & frost dates
The 2 Delaware cities on this site fall in zone 7b. Last spring frost dates range from Apr 9 in Dover to Apr 13 in Wilmington.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Wilmington | 7b | Apr 13 | Oct 30 | 73,176 |
| Dover | 7b | Apr 9 | Oct 31 | 40,191 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.