Delaware planting zones & frost dates
USDA hardiness zones in Delaware go from 7a to 7b. Pick your city for its average frost dates and a planting calendar, or search by ZIP code.
| City | Zone | Avg. last frost | Avg. first frost |
|---|---|---|---|
| Bear | 7b | Apr 7 | Nov 1 |
| Brookside | 7b | Apr 7 | Nov 2 |
| Dover | 7b | Apr 4 | Nov 4 |
| Glasgow | 7b | Apr 7 | Nov 2 |
| Hockessin | 7a | Apr 19 | Oct 26 |
| Middletown | 7b | Apr 7 | Nov 2 |
| Milford | 7b | Apr 11 | Oct 30 |
| Newark | 7b | Apr 7 | Nov 2 |
| Pike Creek Valley | 7b | Apr 7 | Nov 2 |
| Smyrna | 7b | Apr 4 | Nov 4 |
| Wilmington | 7b | Apr 7 | Nov 4 |
Cities with 10,000+ residents. Data: USDA Plant Hardiness Zone Map 2023 and NOAA Climate Normals 1991–2020. Sources and method.