Butler County, Pennsylvania · Frost dates
Butler County frost dates.
First-frost, last-frost, and growing-season length for Butler County, Pennsylvania. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6b
32°F — light freeze
Last spring frost
- 10%
- 05-23
- 20%
- 05-19
- 50%
- 05-07
- 80%
- 04-27
- 90%
- 04-22
First fall frost
- 10%
- 10-01
- 20%
- 10-05
- 50%
- 10-14
- 80%
- 10-24
- 90%
- 10-30
28°F — killing freeze
Last spring freeze
- 10%
- 05-14
- 20%
- 05-08
- 50%
- 04-26
- 80%
- 04-16
- 90%
- 04-10
First fall freeze
- 10%
- 10-12
- 20%
- 10-17
- 50%
- 10-27
- 80%
- 11-04
- 90%
- 11-09
Growing season length (days, 28°F threshold)
- Short year
- 151
- Median
- 184
- Long year
- 213
Source NOAA station
BUTLER 2 SW, PA US
5.0 mi · 30 yrs of record (1991–2020) · 1000 ft elev.
Data from BUTLER 2 SW, PA US, 5 miles away with 30-year NOAA record (1991-2020).
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