What Growing Zone Is Barnum?
Our records indicate the United States Department of Agriculture has given Barnum a growing zone designation of 5a. Sometimes also called the planting or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Barnum's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Barnum's weather data from 1991 - 2020 in their analysis.
Latest IA growing zone mapIf you are looking for plants suitable for growing in the Barnum area, head on over to our page on plants that grow well in Barnum, IA.
Raised Garden Planter
Elevated planter for easy access and better drainage.
Stainless Steel Garden Tool Set
Complete garden tool set with heavy-duty stainless steel tools for all your gardening needs.
Wooden Chicken Coop
Spacious and secure home for your backyard chickens.
Raised Garden Bed Kit
Easy-to-assemble raised garden bed for better soil control and drainage.
Steel Hori Hori Weeding Knife
Versatile Japanese-style gardening knife for weeding and planting.
Latest IA growing zone mapThe growing zone is a measure of the lowest temperature that a plant can survive based on average lowest year temperatures, helping you to decide what plants would grow best in your particular climate. Since Barnum is in growing zone 5a this means that plants there can survive temperatures as low as -20 to -15 degrees Fahrenheit. Plants for Barnum's climate should be chosen with this in mind, or plants should be moved inside to keep their core temperature in the right range if necessary.
Some zones may have been changed by the USDA as of 2023. To see if the Barnum area has been affected, refer to this map of half zone changes from the 2012 version of the USDA zones to the 2023 version.
Half zone changes from 2012 to 2023The updated map shows that over half of the Southeast has warmed by about half a zone. For gardeners, that means you can now grow plants that tolerate a bit more heat and less frost than before. The tan areas reflect this shift. Meanwhile, the white areas had slight temperature changes, but not enough to move them into a new zone. In the Western U.S., a few spots shifted cooler. That’s not due to a colder climate, but because the new map uses a larger dataset, giving a more accurate picture of local conditions. It's important to keep track of these changes when planning your garden!
Hardiness Zone FAQ
Have questions about hardiness zones and what they mean for your garden? Check out our FAQ below for quick answers to common questions about USDA hardiness zones and how they affect plant selection in Barnum, IA.
The USDA hardiness zone is 5a for Barnum. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.
Barnum's Growing Zone Details
USDA Growing Zone: 5a
Zip Codes: 50518
Longitude: -94.3657
Latitude: 42.5062
Lowest Avg Temperatures (F): -20 to -15
Steel Hori Hori Weeding Knife
Versatile Japanese-style gardening knife for weeding and planting.
Brass Decorative Faucet Handle
Elegant brass handle to enhance your garden faucet.
Reusable Grow Bags
Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Metal Seed Storage Box
Organized storage solution for your seed collection.
Map of the Barnum Area
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Rustic Iron Garden Trellis
Sturdy trellis for supporting climbing plants and vines.
Raised Garden Bed Kit
Easy-to-assemble raised garden bed for better soil control and drainage.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Worm Composting Kit
Complete kit for starting your own worm composting system.
Metal Seed Storage Box
Organized storage solution for your seed collection.
Plants For Other States
Looking for the best plants in a different area of the United States? Click on a button below to find plants that are ideal for that state's temperatures.
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Cluck Around Sign
Whimsical sign for your chicken coop area.
Metal Arbor Trellis
Decorative arbor trellis for climbing plants and garden entrance.
Deluxe Plastic Watering Can
High-capacity watering can with comfortable grip and precise spout.
Wooden Chicken Coop
Spacious and secure home for your backyard chickens.
Shiitake Mushroom Kit
Grow your own delicious shiitake mushrooms at home.
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