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Basil Growing Season for Wisconsin

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
WIAshland6/2959
WIBarron6/1879
WIBayfield7/0253
WIBrown6/06110
WIBuffalo5/26122
WIBurnett6/1588
WICalumet6/06110
WIChippewa6/08104
WIClark6/2473
WIColumbia6/08102
WICrawford5/27120
WIDane6/03110
WIDodge6/02108
WIDoor6/10108
WIDouglas7/0641
WIDunn6/1098
WIEau Claire6/1197
WIFond Du Lac5/25129
WIForest7/0156
WIGrant5/30111
WIGreen6/06104
WIGreen Lake6/1397
WIIowa6/07106
WIIron6/2959
WIJackson6/1487
WIJefferson6/07103
WIJuneau6/1093
WIKenosha5/26128
WIKewaunee6/08107
WILa Crosse5/24126
WILafayette6/05105
WILanglade6/2070
WILincoln6/2661
WIManitowoc5/30121
WIMarathon6/2072
WIMarinette6/07100
WIMarquette6/09101
WIMilwaukee5/19135
WIMonroe5/28115
WIOconto6/1396
WIOneida7/1827
WIOutagamie5/26120
WIOzaukee5/24131
WIPierce6/0695
WIPolk6/1388
WIPortage6/02104
WIPrice6/2084
WIRacine6/04114
WIRichland6/1098
WIRock5/20132
WIRusk6/2070
WISauk5/22122
WISawyer7/0851
WIShawano6/1979
WISheboygan5/19136
WITaylor6/1490
WITrempealeau5/25123
WIVernon6/1688
WIVilas6/2469
WIWalworth5/30121
WIWashburn6/1973
WIWashington6/1679
WIWaukesha5/28124
WIWaupaca6/08103
WIWaushara6/1198
WIWinnebago5/27119
WIWood6/1486