Iowa Hardiness Zone Map – The USDA’s “Plant Hardiness Zone Map” shows Iowa’s average low temperature increased over the last 30 years. “Most of Iowa didn’t really change that much,” said Aaron Steil . They are shown in bands on the USDA Hardiness Zone map and numbered Zone 1 (the coldest It also includes most of Iowa, plus southern Wisconsin, northern Illinois and Michigan, as well as much of .
Iowa Hardiness Zone Map New Plant Hardiness Zone Map Has Iowa in Zone 5 | News: Check the updated 2025 Hardiness Zone Map to learn which plants will thrive in your area and which will not. Every ten years or so, the USDA updates its Hardiness Zone Map. The map is the standard . In addition to the map updates, the plant hardiness zone map website was expanded in 2025 to include a “Tips for Growers” section. In addition to the map updates, the plant hardiness zone map website .