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Illinois Plant Hardiness Zones. Hardiness Zones, also referred to as Growing Zones or Planting zones are defined by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS). The zones in this map were created in 2023 using mean extreme climate data covering the period of 1991 to 2020.
View the new 2023 Illinois Hardiness Zone Map. Based on the 1990 USDA Hardiness Zone Map, this interactive version covers the state of Illinois which ranges from USDA Zone 4b to USDA Zone 6b.
22 gru 2023 · Illinois growing zones range from zones 5a to 7b. By looking at the map above and locating the approximate area in which you live, you will be able to find your Illinois hardiness planting zone. Simply compare the color-coded zones for your area with those of the legend on the right of the map.
16 lis 2023 · The USDA released their new Plant Hardiness Zone map, which shows significant changes in Illinois’ hardiness zones, reflecting the impact of human-caused climate change. The newest Illinois maps is available here.
View the new 2023 Illinois Hardiness Zone Map. Based on the 2012 USDA Hardiness Zone Map, this interactive version covers the state of Illinois which ranges from USDA Zone 5a to USDA Zone 7a.
The latest plant hardiness zone map shows Illinois spanning zones 5a to 7b. The most northern zone (5a) is isolated to the very northwest corner of the state, while much of the rest of northern Illinois is in zone 5b.
The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which perennial plants are most likely to thrive at a location. The map is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones and 5-degree F half zones.
