Delaware frost dates: Last spring and first autumn frost at every NOAA station, 1991-2020
Across Delaware's 7 NOAA stations with frost dates, the median last spring frost (32°F) runs from March 29 in Lewes to April 11 in Greenwood; for half of its places it comes after April 7.
- Typical last spring frost
- April 7median of 6 places
- Typical first autumn frost
- November 4median of 6 places
- Earliest last frost
- March 29Lewes
- Latest last frost
- April 11Greenwood
When is the last frost in Delaware, town by town?
Each date is NOAA's: "after April 7 in half of years" means the last 32°F night of spring came after April 7 in half of the years 1991-2020. By the 1-in-10 date, the last frost has passed in nine years out of ten.
Find your town in the list, or look up a ZIP code for the stations nearest it.
| Place or station | Last frost (median) | 1 in 10 after | First frost (median) | 1 in 10 before | Growing season | Zone |
|---|---|---|---|---|---|---|
| Lewes | March 29 | April 9 | November 14 | November 1 | 231 days | 8a |
| Dover | April 4 | April 17 | November 4 | October 23 | 214 days | 7b |
| GeorgetownGeorgetown-Delaware Coastal Airport | April 4 | April 16 | November 6 | October 23 | 217 days | 7b |
| NewarkNewark Agricultural Farm | April 7 | April 21 | November 2 | October 19 | 208 days | – |
| WilmingtonWilmington Airport | April 7 | April 21 | November 1 | October 19 | 209 days | 7b |
| Wilmington Porter Research | April 7 | April 24 | November 4 | October 21 | 209 days | 7b |
| Greenwood2 mi NE | April 11 | April 28 | October 30 | October 14 | 200 days | 7b |
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities, growing-season length); station daily lows via ACIS (zone). Growing season: NOAA's median number of days between the last spring and first autumn 32°F night. Zone: the USDA's plant hardiness rule applied to the station's own 1991-2020 coldest nights.