What Growing Zone Is Ontario?

Our records indicate the United States Department of Agriculture has given Ontario a growing zone designation of 7a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Ontario's climate based on the average extreme annual temperature. .Our data is based on the latest 2023 USDA maps, which used Ontario's weather data from 1991 - 2020 in their analysis.

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

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Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.

Wooden Chicken Coop

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Latest OR growing zone map

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 Ontario is in growing zone 7a this means that plants there can survive temperatures as low as 0 to 5 degrees Fahrenheit. Plants for Ontario'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 Ontario area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.

Half zone changes from 2012 to 2023

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!

Ontario's Growing Zone Details

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High-capacity watering can with comfortable grip and precise spout.

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Versatile Japanese-style gardening knife for weeding and planting.

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Map of the Ontario Area

All Towns In OR

Raised Garden Planter

Elevated planter for easy access and better drainage.

Metal Seed Storage Box

Organized storage solution for your seed collection.

Reusable Grow Bags

Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.

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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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Complete kit for starting your own worm composting system.

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Rustic Iron Garden Trellis

Sturdy trellis for supporting climbing plants and vines.

Steel Hori Hori Weeding Knife

Versatile Japanese-style gardening knife for weeding and planting.

Raised Garden Planter

Elevated planter for easy access and better drainage.