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Basil Growing Season for Pennsylvania

The NOAA National Climatic Data Center provides information to the public about spring and fall frost dates in the United States and the length of the expected growing season for each area. These statistics are calculated using data collected from 1971 to 2000, across 4300 weather stations located in every part of the country.

While informative, the statistics that NOAA provides is overwhelming. So, we took the liberty of extracting the most basic information that we feel would be useful to someone interested in growing basil outdoors.

The table below lists the date after which it should be safe to plant basil outdoors in each area of the state. This information is based on NOAA’s calculations for a 10% probability of temperatures falling below 36 degrees Fahrenheit. This means that, on average, there is only a 10% chance that you will see frost after this date. Also listed is the estimated length of the growing season. This is how many days you can expect to have before the risk of frost is greater than 10%.

Please use this information at your own risk. You must take into consideration many varying factors, for example, micro-climates or the presence of valleys and bodies of water, to determine your actual growing season.

StateCountyLast Frost DateLength of Growing Season
PAAllegheny5/31116
PAArmstrong6/08111
PABeaver5/28124
PABedford6/03104
PABlair6/05103
PABradford6/03108
PABucks5/22127
PAButler6/13100
PACambria6/2967
PACameron6/07112
PACarbon6/03103
PACentre5/24120
PAChester5/26129
PAClarion6/1496
PAClinton6/05102
PACrawford6/14105
PACumberland5/15140
PADelaware4/20191
PAElk6/2281
PAErie5/30134
PAFayette6/06112
PAForest6/1499
PAFranklin5/21130
PAGreene6/09105
PAIndiana6/13102
PALancaster5/17135
PALawrence6/12103
PALebanon5/20128
PALehigh5/14139
PALuzerne6/2466
PALycoming5/24125
PAMckean7/0745
PAMercer6/1585
PAMifflin5/20124
PAMonroe6/06106
PAMontgomery5/12141
PAPhiladelphia4/27172
PAPike5/28118
PASnyder5/24120
PASomerset6/11105
PASusquehanna6/1297
PATioga6/1291
PAUnion6/0799
PAVenango6/14110
PAWarren6/13101
PAWashington5/29128
PAWayne6/10100
PAWestmoreland6/1887
PAYork5/31116