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Basil Growing Season for Montana

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
MTBeaverhead8/012
MTBig Horn7/2032
MTBlaine6/1771
MTBroadwater7/0660
MTCarbon7/1246
MTCarter7/0158
MTCascade8/013
MTChouteau7/1048
MTCuster6/1482
MTDawson5/25107
MTFallon6/2564
MTFergus7/0266
MTFlathead7/0653
MTGallatin7/1927
MTGarfield6/1591
MTGlacier7/2712
MTGolden Valley7/1241
MTGranite7/298
MTHill6/1279
MTJefferson7/2031
MTJudith Basin7/0359
MTLake7/0265
MTLewis And Clark6/2271
MTLiberty6/2068
MTLincolnN/ANo growing season for this area.
MTMadison7/2519
MTMccone6/2856
MTMeagher7/2910
MTMineral7/0267
MTMissoula8/024
MTMusselshell6/0991
MTParkN/ANo growing season for this area.
MTPetroleum6/2671
MTPhillips6/2276
MTPondera7/1538
MTPowder River6/2379
MTPowell7/315
MTPrairie6/1775
MTRavalliN/ANo growing season for this area.
MTRichland6/0498
MTRoosevelt6/2662
MTRosebud6/2676
MTSanders6/2280
MTSheridan6/1387
MTSilver Bow7/2127
MTStillwater7/1547
MTSweet Grass6/2470
MTTeton6/2375
MTToole7/2525
MTTreasure7/0655
MTValley6/01103
MTWheatland7/0750
MTWibaux6/2377
MTYellowstone6/0497