What Growing Zone Is Riley?
Our records indicate the United States Department of Agriculture has given Riley 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 Riley's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Riley's weather data from 1991 - 2020 in their analysis.
Latest IL growing zone mapIf you are looking for plants suitable for growing in the Riley area, head on over to our page on plants that grow well in Riley, IL.
Cluck Around Sign
Whimsical sign for your chicken coop area.
Hydroponic Garden Grow Kit
Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.
Metal Arbor Trellis
Decorative arbor trellis for climbing plants and garden entrance.
Wooden Chicken Coop
Spacious and secure home for your backyard chickens.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
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 Riley is in growing zone 5b this means that plants there can survive temperatures as low as -15 to -10 degrees Fahrenheit. Plants for Riley'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 Riley 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!
Hardiness Zone FAQ
Have questions about hardiness zones and what they mean for your garden? Check out our FAQ below for quick answers to common questions about USDA hardiness zones and how they affect plant selection in Riley, IL.
The USDA hardiness zone is 5b for Riley. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.
Riley's Growing Zone Details
USDA Growing Zone: 5b
Zip Codes:
Longitude: -88.6287
Latitude: 42.1929
Lowest Avg Temperatures (F): -15 to -10
Cute Foldable Straw Bow Hat
A foldable hat for ladies that does not sacrifice style, perfect for the fashionable gardener in your life.
Fluffy Butt Hut Sign
For the chicken owner with a sense of humor.
Metal Arbor Trellis
Decorative arbor trellis for climbing plants and garden entrance.
Raised Garden Planter
Elevated planter for easy access and better drainage.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
Map of the Riley Area
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Wooden Chicken Coop
Spacious and secure home for your backyard chickens.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
Hoeing Ain't Easy Garden Sign
Fun and decorative garden sign to add personality to your space.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Large Greenhouse Kit
Spacious greenhouse for extending your growing season.
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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Fluffy Butt Hut Sign
For the chicken owner with a sense of humor.
Deluxe Plastic Watering Can
High-capacity watering can with comfortable grip and precise spout.
Heavy Duty Garden Utility Wagon
Let gardeners haul it all with this rugged utility wagon from Gorilla Carts.
Small Greenhouse Kit
Compact greenhouse perfect for small spaces.
Hoeing Ain't Easy Garden Sign
Fun and decorative garden sign to add personality to your space.
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