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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.
- New USDA Plant Hardiness Zones Map – Illinois State Climatologist
The USDA released their new Plant Hardiness Zone map, which...
- Updated USDA Plant Hardiness Zones released in November
The Plant Hardiness Zones detailed in the new map define 13...
- New USDA Plant Hardiness Zones Map – Illinois State Climatologist
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.
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.
5a - -20°F to -15°F. Hardiness Zones, Growing Zones and Planting Zones for Illinois Featuring an Interactive Illinois Hardiness Zone Map.
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.
3 sty 2024 · The Plant Hardiness Zones detailed in the new map define 13 distinct zones across the US and its territories. These zones are delineated based on the average annual lowest minimum temperature. More simply put, the zones represent the lowest temperature each year, on average, for a geographic area.
Using the 1990 USDA Hardiness Zone classifications, this updated interactive version covers the state of Illinois and was compiled using National Weather Service climate data through 2009 and covering a broader time frame than the 30 year range used in the current USDA map. Plantmaps Zone 4a. -30°F to -25°F. Plantmaps Zone 4b. -25°F to -20°F.
