Home › Frost dates › Delaware
Delaware frost dates
Across the 2Delaware weather stations below, the average last spring frost ranges from Apr 4 in Georgetown Sussex to Apr 7 in Wilmington New Castle. The statewide middle is about Apr 6 for the last spring frost and Nov 4 for the first fall frost. Georgetown Sussex has the longest growing season, about 216 days. Hardiness zones in these places: 7b.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Georgetown Sussex | 7b | Apr 4 | Apr 16 | Nov 6 | 216 |
| Wilmington New Castle | 7b | Apr 7 | Apr 21 | Nov 1 | 208 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Delaware
Using the statewide middle dates (last frost Apr 6, first frost Nov 4). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Delaware |
|---|---|
| Tomatoes | Apr 13 – Apr 27 |
| Peas | Feb 23 – Mar 16; fall: Aug 12 – Sep 2 |
| Potatoes | Mar 9 – Mar 30 |
| Green beans | Apr 13 – Apr 27; fall: Aug 19 – Sep 2 |
| Garlic | Nov 4 – Dec 2 |
| Tulips | Oct 21 – Dec 2 |