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What Is the Indiana Growing Zone?
What Is the Indiana Growing Zone?. Indiana's growing zones vary depending on where you live in the state. According to the 1990 USDA Plant Hardiness Zone Map, the largest urban areas in Indiana such as Indianapolis, Fort Wayne and Gary carry a warmer zone designation than the surrounding countryside.
Indiana's growing zones vary depending on where you live in the state. According to the 1990 USDA Plant Hardiness Zone Map, the largest urban areas in Indiana such as Indianapolis, Fort Wayne and Gary carry a warmer zone designation than the surrounding countryside.
Zone 5a
The coldest growing zone in Indiana has temperatures that fall -20 to -15 Fahrenheit during the average winter. This zone is predominately located in the Northwestern part of the state.
Zone 5b
This zone covers the majority of the state but is mostly located around central Indiana and the Northeast section of the state. Average low temperatures for this zone are -15 to -10.
Zone 6a
Southern Indiana, south of Indianapolis, is the only section of the state to have average low temperatures reaching -10 to -5.
Zone 6b
Along the Ohio River in the Southwest corner of Indiana, average low temperatures only reach -5 to 0.
Zone Map Warnings
Although the newest version of the map contains much detail, it does not account for stress factors such as gaseous and particulate pollution, security lighting, toxic wastes and other pollutants that decrease a plant's performance. Check with your local plant nursery or garden center to make sure plants you are selecting for your landscape are fitting for your area.
