Philadelphia County, Pennsylvania · Frost dates
Philadelphia County frost dates.
First-frost, last-frost, and growing-season length for Philadelphia County, Pennsylvania. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6b
32°F — light freeze
Last spring frost
- 10%
- 04-12
- 20%
- 04-07
- 50%
- 03-30
- 80%
- 03-20
- 90%
- 03-15
First fall frost
- 10%
- 11-04
- 20%
- 11-08
- 50%
- 11-17
- 80%
- 11-28
- 90%
- 12-04
28°F — killing freeze
Last spring freeze
- 10%
- 03-31
- 20%
- 03-27
- 50%
- 03-17
- 80%
- 03-07
- 90%
- 03-01
First fall freeze
- 10%
- 11-12
- 20%
- 11-17
- 50%
- 11-29
- 80%
- 12-11
- 90%
- 12-18
Growing season length (days, 28°F threshold)
- Short year
- 226
- Median
- 257
- Long year
- 292
Source NOAA station
PHILA FRANKLIN INST, PA US
4.1 mi · 30 yrs of record (1991–2020) · 60 ft elev.
Data from PHILA FRANKLIN INST, PA US, 4.1 miles away with 30-year NOAA record (1991-2020).
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