Delaware frost dates
Across 7 NOAA climate stations in Delaware, the median last spring frost (32°F) ranges from Mar 29 at Lewes to Apr 11 at Greenwood 2NE; the typical station sees its last frost around Apr 7 and its first fall frost around Nov 4.
“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.
| Station | Elevation | Last frost (median) | Last frost (10% risk) | First frost (median) | First frost (10% risk) | Growing season |
|---|---|---|---|---|---|---|
| Dover | 30 ft | Apr 4 | Apr 17 | Nov 4 | Oct 23 | 214 days |
| Georgetown Sussex Co AP | 51 ft | Apr 4 | Apr 16 | Nov 6 | Oct 23 | 217 days |
| Greenwood 2NE | 45 ft | Apr 11 | Apr 28 | Oct 30 | Oct 14 | 200 days |
| Lewes | 10 ft | Mar 29 | Apr 9 | Nov 14 | Nov 1 | 231 days |
| Newark Ag Farm | 106 ft | Apr 7 | Apr 21 | Nov 2 | Oct 19 | 208 days |
| Wilmington New Castle Co AP | 79 ft | Apr 7 | Apr 21 | Nov 1 | Oct 19 | 209 days |
| Wilmington Porter Rsch | 270 ft | Apr 7 | Apr 24 | Nov 4 | Oct 21 | 209 days |
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