What Growing Zone Is El Cajon?
Our records indicate the United States Department of Agriculture has given El Cajon a growing zone designation of 10a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in El Cajon's climate based on the average extreme annual temperature. .Our data is based on the latest 2023 USDA maps, which used El Cajon's weather data from 1991 - 2020 in their analysis.

If you are looking for plants suitable for growing in the El Cajon area, head on over to our page on plants that grow well in El Cajon, CA.

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The growing zone is a measure of the lowest temperature that a plant can survive based on average lowest year temperatures, helping you to decide what plants would grow best in your particular climate. Since El Cajon is in growing zone 10a this means that plants there can survive temperatures as low as 30 to 35 degrees Fahrenheit. Plants for El Cajon's climate should be chosen with this in mind, or plants should be moved inside to keep their core temperature in the right range if necessary.

Some zones may have been changed by the USDA as of 2023. To see if the El Cajon area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.

The updated map shows that over half of the Southeast has warmed by about half a zone. For gardeners, that means you can now grow plants that tolerate a bit more heat and less frost than before. The tan areas reflect this shift. Meanwhile, the white areas had slight temperature changes, but not enough to move them into a new zone. In the Western U.S., a few spots shifted cooler. That’s not due to a colder climate, but because the new map uses a larger dataset, giving a more accurate picture of local conditions. It's important to keep track of these changes when planning your garden!
El Cajon's Growing Zone Details
USDA Growing Zone: 10a
Zip Codes: 92020, 92021, 92019
Longitude: -116.9604
Latitude: 32.8017
Lowest Avg Temperatures (F): 30 to 35

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Map of the El Cajon Area
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Plants For Other States:
Looking for the best plants in a different area of the United States? Click on a button below to find plants that are ideal for that state's temperatures.

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