NOAA 1991–2020 freeze normals
Frost Dates in Delaware
Last and first frost at the 8 NOAA stations behind this site's Delaware pages.
At the middle station of the 8 in Delaware where a freeze comes every year, the last spring frost (50%) is April 6 and the first fall frost November 4, a freeze-free season of 212 days. The last frost is earliest at Lewes (Lewes, DE, March 29) and latest at Seaford (Greenwood 2NE, DE, April 11), 13 days apart. The season runs from 200 days at Seaford to 231 at Lewes.
6 of these stations were also in NOAA's previous normals, for 1981–2010. Between the two, the median station's freeze-free season grew 6 days longer, with the last spring frost 2 days earlier and the first fall frost 3 days later; the season lengthened at 5 stations and shortened at 1. The two periods share twenty years, so the change reflects mostly 2011–2020 against 1981–1990.
Delaware places by frost date
| Place | ZIP | Last frost | First frost | Season | Winters with 32°F |
|---|---|---|---|---|---|
| New Castle | 19720 | April 7 | November 1 | 209 d | 100% |
| Newark | 19702 | April 7 | November 2 | 208 d | 100% |
| Wilmington | 19805 | April 7 | November 4 | 209 d | 100% |
| Dover | 19901 | April 4 | November 4 | 214 d | 100% |
| Millsboro | 19966 | April 4 | November 6 | 217 d | 100% |
| Lewes | 19958 | March 29 | November 14 | 231 d | 100% |
| Seaford | 19973 | April 11 | October 30 | 200 d | 100% |
| Laurel | 19956 | April 2 | November 10 | 222 d | 100% |
50% dates from NOAA NCEI U.S. Climate Normals 1991–2020, one row per station; a state page is published when at least 5 stations stand behind its pages. Where a freeze comes in fewer than nine winters in ten, the dates describe the winters that have one.