Illinois Planting Zone Map: An Essential Guide for Gardeners


Gardening in Illinois can be a rewarding experience, but it’s important to understand the state’s planting zones to ensure success. The Illinois planting zone map is a useful tool for gardeners to determine which plants are suitable for their area.

What is a Planting Zone?

A planting zone is a geographic area that is defined by specific climate conditions such as temperature, rainfall, and frost dates. The United States Department of Agriculture (USDA) has divided the country into 13 different planting zones based on these factors.

The zones are numbered from 1 to 13, with 1 being the coldest and 13 being the warmest. Each zone has a range of average annual minimum temperatures that determine which plants can survive in that area.

Illinois Planting Zone MapSource:

Illinois Planting Zones

Illinois is located in planting zones 5 to 7, which means that the state experiences a range of temperatures from -20°F to 10°F in the winter. The USDA has divided Illinois into four different zones:

  • Zone 5a: Average minimum temperature of -20°F to -15°F
  • Zone 5b: Average minimum temperature of -15°F to -10°F
  • Zone 6a: Average minimum temperature of -10°F to -5°F
  • Zone 6b: Average minimum temperature of -5°F to 0°F
  • Zone 7a: Average minimum temperature of 0°F to 5°F
  • Zone 7b: Average minimum temperature of 5°F to 10°F

It’s important to note that these zones are just a guide and not a guarantee of success. Other factors such as soil type, moisture, and sun exposure can also affect plant growth.

Choosing Plants for Your Zone

Once you know your planting zone, you can choose plants that are suitable for your area. The USDA has a plant hardiness zone map that lists the recommended plants for each zone.

For example, in zone 5a, you can grow cold-hardy plants such as coneflowers, phlox, and yarrow. In zone 7b, you can grow warmer climate plants such as azaleas, camellias, and magnolias.


Planting Tips for Illinois Gardeners

In addition to choosing the right plants for your zone, there are other factors to consider when planting a garden in Illinois. Here are some tips:

  • Plant in the spring after the last frost date for your zone
  • Choose plants that are suitable for your soil type
  • Water regularly, especially during dry spells
  • Use mulch to retain moisture and control weeds
  • Fertilize according to the needs of each plant
  • Prune and deadhead regularly to promote healthy growth


The Illinois planting zone map is an essential tool for gardeners in the state. By understanding your zone and choosing the right plants, you can create a beautiful and thriving garden. Remember to also consider other factors such as soil type and moisture when planning and maintaining your garden.

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