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Basil Growing Season for Colorado

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
COAdams6/1396
COAlamosa7/1441
COArapahoe6/1196
COBaca5/21122
COBent5/25120
COBoulder5/31113
COChaffee7/2018
COCheyenne5/27116
COClear Creek8/012
COConejos7/1136
COCostilla7/0952
COCuster7/2219
CODelta6/1498
CODenver5/27115
CODoloresN/ANo growing season for this area.
CODouglas6/1688
COEl Paso5/30112
COFremont6/04115
COGarfield6/2477
COGrandN/ANo growing season for this area.
COGunnison7/313
COHinsdale7/2416
COHuerfano6/03105
COJacksonN/ANo growing season for this area.
COJefferson7/1822
COKiowa5/29117
COKit Carson5/23122
COLa Plata7/1154
COLake7/286
COLarimer5/27118
COLas Animas6/03110
COLogan5/31110
COMesa5/30128
COMineralN/ANo growing season for this area.
COMoffat6/1886
COMontezuma6/14100
COMontrose6/10107
COMorgan5/20126
COOtero5/25121
COOuray6/2777
COPark7/1242
COPhillips5/26114
COPitkinN/ANo growing season for this area.
COProwers5/22120
COPueblo5/26120
CORio Blanco6/1983
CORio Grande6/3073
CORouttN/ANo growing season for this area.
COSaguache7/0637
COSan JuanN/ANo growing season for this area.
COSan Miguel7/2910
COSedgwick5/26117
COSummitN/ANo growing season for this area.
COWashington6/07102
COWeld5/26117
COYuma5/26115