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Basil Growing Season for Idaho

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
IDAda5/26127
IDAdams7/315
IDBannock7/0264
IDBear Lake6/2961
IDBenewah7/0167
IDBingham7/1042
IDBlaine7/1832
IDBoise7/2317
IDBonner7/1341
IDBonneville7/2420
IDBoundary6/1387
IDButte7/1048
IDCamas7/2712
IDCanyon6/09104
IDCaribou7/1437
IDCassia6/2972
IDClark7/0759
IDClearwater5/30116
IDCuster7/2131
IDElmore6/08109
IDFranklin6/3050
IDFremont7/1634
IDGem6/1792
IDGooding6/2278
IDIdaho6/1888
IDJefferson7/2223
IDJerome6/2575
IDKootenai6/0999
IDLatah7/1837
IDLemhi6/2968
IDLewis7/2419
IDLincoln6/2774
IDMinidoka7/0164
IDNez Perce5/18134
IDOneida7/1337
IDOwyhee6/12100
IDPayette6/1490
IDPower7/1535
IDShoshone6/2474
IDTeton7/2220
IDTwin Falls7/0961
IDValley7/2815
IDWashington6/3064