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Basil Growing Season for Oregon

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
ORBaker6/10111
ORBenton6/01120
ORClackamas6/2289
ORClatsop5/27129
ORColumbia6/3059
ORCoos6/01121
ORCrook7/2718
ORCurry5/03204
ORDeschutes7/2618
ORDouglas5/26128
ORGilliam7/1354
ORGrantN/ANo growing season for this area.
ORHarney7/1541
ORHood River6/07104
ORJackson7/2420
ORJefferson8/022
ORJosephine6/2083
ORKlamath7/2323
ORLake7/0748
ORLane5/29122
ORLincoln6/06132
ORLinn6/2577
ORMalheur7/2227
ORMarion5/23151
ORMorrow6/1595
ORMultnomah5/10152
ORPolk6/16102
ORSherman7/0668
ORTillamook6/08126
ORUmatillaN/ANo growing season for this area.
ORUnion7/0855
ORWallowa7/2331
ORWasco7/1348
ORWashington5/28125
ORWheeler7/2719
ORYamhill6/21100