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Basil Growing Season for Iowa

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
IAAdair5/13134
IAAdams5/22119
IAAllamakee5/20127
IAAppanoose5/11140
IAAudubon5/23117
IABenton5/22121
IABlack Hawk5/23114
IABoone5/16133
IABremer5/22122
IABuena Vista5/19126
IAButler5/20122
IACalhoun5/16127
IACarroll5/24113
IACass5/31104
IACedar5/22122
IACerro Gordo5/29109
IACherokee6/01106
IAChickasaw5/23122
IAClarke5/15131
IAClay5/24115
IAClayton5/17133
IAClinton5/21127
IACrawford5/15132
IADallas5/18123
IADavis5/12138
IADecatur5/09142
IADes Moines5/09148
IADickinson5/24115
IADubuque5/29110
IAEmmet5/24116
IAFayette5/24118
IAFloyd5/26114
IAFranklin5/20122
IAFremont5/10141
IAGreene5/19126
IAGrundy5/22119
IAGuthrie5/24112
IAHamilton5/29109
IAHancock5/22120
IAHardin5/15132
IAHarrison5/20123
IAHenry5/19135
IAHoward6/04104
IAIda5/19119
IAIowa5/22121
IAJackson5/26115
IAJasper5/17121
IAJefferson5/17137
IAJohnson5/12141
IAJones6/03105
IAKeokuk5/14138
IAKossuth5/18124
IALee5/03151
IALinn5/16129
IALouisa5/20127
IALucas5/28113
IALyon5/31106
IAMadison5/23122
IAMahaska5/16134
IAMarion5/10143
IAMarshall5/19121
IAMills5/21122
IAMitchell5/18125
IAMonona5/19123
IAMonroe5/16134
IAMontgomery5/18119
IAMuscatine5/16130
IAO'brien5/20119
IAOsceola5/27112
IAPage5/17127
IAPalo Alto5/17127
IAPlymouth5/23116
IAPocahontas5/21117
IAPolk5/13138
IAPottawattamie5/31109
IAPoweshiek6/01105
IARinggold5/17129
IASac5/22119
IAScott5/09144
IAShelby5/19124
IASioux5/27109
IAStory5/15125
IATama5/26116
IATaylor5/18126
IAUnion5/17129
IAVan Buren5/20127
IAWapello5/11141
IAWarren5/24118
IAWashington5/13137
IAWebster5/17123
IAWinnebago5/19123
IAWinneshiek5/30115
IAWoodbury5/20119
IAWorth5/20121
IAWright5/25112