Plant Hardiness Zones in Illinois

Areas in Illinois Where Plants Are Most Likely to Thrive

Not all plants thrive under the same temperature and climate conditions. Therefore, it is important to know your state’s climate zone so you know what plants you can successfully grow there. Most gardeners use the USDA Hardiness Zone Map to determine what plants thrive in a specific location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones. Below is the map for Illinois. Illinois is known for its cold winters and warm summers. On average, Illinois contains 170 days between the last and first frost. We recommend planting yarrows, hostas, and daylilies here.

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