Allegheny County, Pennsylvania · Frost dates
Allegheny County frost dates.
First-frost, last-frost, and growing-season length for Allegheny County, Pennsylvania. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6b
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-05
- 50%
- 04-24
- 80%
- 04-15
- 90%
- 04-09
First fall frost
- 10%
- 10-13
- 20%
- 10-18
- 50%
- 10-27
- 80%
- 11-03
- 90%
- 11-07
28°F — killing freeze
Last spring freeze
- 10%
- 04-26
- 20%
- 04-22
- 50%
- 04-12
- 80%
- 04-02
- 90%
- 03-28
First fall freeze
- 10%
- 10-24
- 20%
- 10-29
- 50%
- 11-05
- 80%
- 11-14
- 90%
- 11-20
Growing season length (days, 28°F threshold)
- Short year
- 181
- Median
- 207
- Long year
- 237
Source NOAA station
EMSWORTH L/D OHIO RVR, PA US
6.2 mi · 30 yrs of record (1991–2020) · 717 ft elev.
Data from EMSWORTH L/D OHIO RVR, PA US, 6.2 miles away with 30-year NOAA record (1991-2020).
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