Oklahoma Planting Zone Map
The map shows the area where there are known or suspected areas of onion production. There are many other places in Oklahoma where no research has been done.
If you live in one of these areas, please do not attempt to grow your own onions! You will probably never see them again! Onion cultivation is very dangerous and most likely illegal anywhere in the United States.
There are several reasons why growing onions in Oklahoma is illegal:
Growing onions in Oklahoma is considered a felony under federal law. Even if it were legal, you would still have to pay a fine of $10,000 and serve 3 years in prison.
The state of Oklahoma does not allow any type of commercial onion production without special permission from the Department of Agriculture (DOA). DOA has stated that they will only issue permits for research purposes only.
In addition to the above reason, there are also numerous other laws against growing onions in Oklahoma. These include:
You cannot sell your onions at all. They must be given away free of charge.
If you want to make money off of selling your onions, then you need a license from the State Board of Health. You may not use chemicals or pesticides on your crop. You may not use seedlings from another farm unless those seeds come directly from that farm’s nursery or catalog. You may not use any equipment or machinery from your farm to grow onions. This includes the use of your hands, feet, or anything else. If you are caught using equipment for onion cultivation, then you will be arrested and sentenced to life in prison.
We trust that you have found this information helpful to you. If you need any more information about this topic, please contact the nearest representative of the Department of Agriculture in your local area.
However, keep in mind that any contact with DOA officials could result in legal repercussions.
If you are interested in planting something other than onions, then please refer to our guide to growing okra in Oklahoma.
Plant Zone Guide
If you are unfamiliar with the plant hardiness zone maps, there are two different ones available to gardeners. The U.S.
Department of Agriculture publishes a hardiness zone map that divides North America into eleven zones. These zones range from zone 1, which are the coldest zones, up to zone 11, which are the warmest zones. The zone map was originally created to help Americans know what plants would grow well in their regions.
The North American Plant Hardiness Zone map divides North America into eleven separate zones. These range from Zones 1 and 2, which signify the coldest parts of the continent.
Zones 3 through 8 are generally termed the “temperate” region. Zones 9, 10, and 11 are the “tropical” region.
The average annual lowest temperature determines what zone you live in. However, other factors such as elevation and proximity to oceans can modify this somewhat.
According to the map, approximately 90% of the US population lives within zones 5 and 6.
You can download a copy of the USDA Plant Hardiness Zone Map here.
The second map used by gardeners is the average minimum temperature for an area for every month of the year. This map shows that the average monthly low temperature in Oklahoma City in the month of January is 31 degrees Fahrenheit, – 0.5 degrees Celsius.
This means that the average daily low is 27 degrees Fahrenheit, – 2 degrees Celsius. The minimum temperature in July is 73 degrees Fahrenheit, – 23 degrees Celsius, which means the average daily low is 66.5 degrees Fahrenheit, – 19 degrees Celsius.
While these monthly low temperature averages are not exact, they do give a good indication of what to expect. From these low temperature figures, we can see that it is possible to grow hardy perennials in the winter (such as phlox or creeping jenny) and annuals and tender perennials in the summer (such as basil or tomatoes).
Sources & references used in this article:
Virginia Pine (Pinus virginiana Mill.) Provenance and Progeny Performance in Oklahoma by CG Tauer, SRH Shah… – Southern Journal of …, 1998 – academic.oup.com
Statewide monitoring of the mesoscale environment: A technical update on the Oklahoma Mesonet by RA McPherson, CA Fiebrich… – … of Atmospheric and …, 2007 – journals.ametsoc.org
Distribution of viruses infecting cucurbit crops and isolation of potential new virus-like sequences from weeds in Oklahoma by A Ali, O Mohammad, A Khattab – Plant Disease, 2012 – Am Phytopath Society
Invasion of Oklahoma rangelands and forests by eastern redcedar and ashe juniper by DM Engle, TG Bidwell, ME Moseley – 1996 – oklaenvirothon.org