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Basil Growing Season for Ohio

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
OHAllen5/19134
OHAshland6/02113
OHAshtabula6/1790
OHAthens6/05107
OHBelmont5/31120
OHBrown5/16135
OHChampaign5/25128
OHClark5/26122
OHClermont5/17141
OHClinton5/13135
OHColumbiana6/1687
OHCoshocton5/27121
OHCrawford5/21129
OHCuyahoga5/27128
OHDarke5/21122
OHDefiance5/19133
OHDelaware5/27126
OHErie5/08157
OHFayette5/13142
OHFranklin5/13138
OHFulton5/21131
OHGallia5/22131
OHGeauga6/16102
OHGreene5/19127
OHGuernsey5/29123
OHHamilton5/11147
OHHancock5/16137
OHHardin5/24127
OHHarrison5/23131
OHHighland5/14141
OHHolmes5/31117
OHHuron5/26125
OHJackson5/28119
OHJefferson5/24134
OHKnox5/23126
OHLake5/16149
OHLicking5/26122
OHLogan5/20129
OHLorain6/04108
OHLucas5/29119
OHMadison5/27122
OHMarion5/24124
OHMedina6/04108
OHMeigs6/01117
OHMercer5/18131
OHMontgomery5/06153
OHMorgan5/29122
OHMuskingum6/02117
OHPaulding5/25122
OHPerry5/30117
OHPickaway5/19134
OHPike5/26124
OHPortage5/27130
OHPreble5/25125
OHPutnam5/17133
OHRichland6/05111
OHSandusky5/17135
OHScioto5/15132
OHSeneca5/17135
OHSummit5/26134
OHTrumbull6/11106
OHTuscarawas6/01119
OHUnion5/21131
OHVan Wert5/17135
OHWarren5/16134
OHWashington5/16140
OHWayne5/30116
OHWilliams5/29120
OHWood5/27120
OHWyandot5/19132