New Castle County, Delaware · Frost dates
New Castle County frost dates.
First-frost, last-frost, and growing-season length for New Castle County, Delaware. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-21
- 20%
- 04-16
- 50%
- 04-07
- 80%
- 03-31
- 90%
- 03-26
First fall frost
- 10%
- 10-19
- 20%
- 10-24
- 50%
- 11-01
- 80%
- 11-11
- 90%
- 11-15
28°F — killing freeze
Last spring freeze
- 10%
- 04-09
- 20%
- 04-04
- 50%
- 03-27
- 80%
- 03-17
- 90%
- 03-11
First fall freeze
- 10%
- 11-01
- 20%
- 11-04
- 50%
- 11-14
- 80%
- 11-25
- 90%
- 12-01
Growing season length (days, 28°F threshold)
- Short year
- 206
- Median
- 232
- Long year
- 265
Source NOAA station
WILMINGTON NEW CASTLE CO AP, DE US
7.1 mi · 30 yrs of record (1991–2020) · 79 ft elev.
Data from WILMINGTON NEW CASTLE CO AP, DE US, 7.1 miles away with 30-year NOAA record (1991-2020).
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