What Growing Zone Is Ottawa?
Our records indicate the United States Department of Agriculture has given Ottawa a growing zone designation of 5b. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Ottawa's climate based on the average extreme annual temperature. .Our data is based on the latest 2023 USDA maps, which used Ottawa's weather data from 1991 - 2020 in their analysis.
If you are looking for plants suitable for growing in the Ottawa area, head on over to our page on plants that grow well in Ottawa, IL.
Raised Garden Planter
Elevated planter for easy access and better drainage.
Rustic Iron Garden Trellis
Sturdy trellis for supporting climbing plants and vines.
Hydroponic Garden Grow Kit
Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.
Large Greenhouse Kit
Spacious greenhouse for extending your growing season.
Hoeing Ain't Easy Garden Sign
Fun and decorative garden sign to add personality to your space.
Latest IL growing zone mapThe 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 Ottawa is in growing zone 5b this means that plants there can survive temperatures as low as -15 to -10 degrees Fahrenheit. Plants for Ottawa'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 Ottawa 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 2023The 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!
Ottawa's Growing Zone Details
USDA Growing Zone: 5b
Zip Codes: 61350
Longitude: -88.8261
Latitude: 41.3555
Lowest Avg Temperatures (F): -15 to -10
Brass Decorative Faucet Handle
Elegant brass handle to enhance your garden faucet.
Rustic Iron Garden Trellis
Sturdy trellis for supporting climbing plants and vines.
Shiitake Mushroom Kit
Grow your own delicious shiitake mushrooms at home.
Self Watering Plant Pots
Innovative pots that maintain optimal moisture levels.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Map of the Ottawa Area
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Hoeing Ain't Easy Garden Sign
Fun and decorative garden sign to add personality to your space.
Raised Garden Bed Kit
Easy-to-assemble raised garden bed for better soil control and drainage.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
Brass Watering Can
Elegant brass watering can with classic design and durability.
Reusable Grow Bags
Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
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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Brass Watering Can
Elegant brass watering can with classic design and durability.
Small Greenhouse Kit
Compact greenhouse perfect for small spaces.
Deluxe Plastic Watering Can
High-capacity watering can with comfortable grip and precise spout.
Self Watering Plant Pots
Innovative pots that maintain optimal moisture levels.
Rustic Iron Garden Trellis
Sturdy trellis for supporting climbing plants and vines.
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