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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.
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.
View the new 2023 Ohio Hardiness Zone Map. Based on the 1990 USDA Hardiness Zone Map, this interactive version covers the state of Ohio which ranges from USDA Zone 5a to USDA Zone 6b.
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.
According to the 2023 USDA Hardiness Zone Map Ohio, Illinois is in Zones 5b (-15°F to -10°F). There is no change from the 2012 USDA Hardiness Zone Map which has Ohio in also in Zones 5b (-15°F to -10°F).
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.
22 gru 2023 · Ohio gardeners who want to ensure their perennial flowers, shrubs and trees survive all season should use the Ohio planting map, featured above, as a resource. This map divides the United States into hardiness zones based on weather data collected over the last thirty years by the USDA.
