What Growing Zone Is Colwell?
Our records indicate the United States Department of Agriculture has given Colwell 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 Colwell's climate based on the average extreme annual temperature.Our data is based on the latest 2023 USDA maps, which used Colwell's weather data from 1991 - 2020 in their analysis.
Latest IA growing zone mapIf you are looking for plants suitable for growing in the Colwell area, head on over to our page on plants that grow well in Colwell, IA.
Steel Hori Hori Weeding Knife
Versatile Japanese-style gardening knife for weeding and planting.
Raised Garden Planter
Elevated planter for easy access and better drainage.
Deluxe Plastic Watering Can
High-capacity watering can with comfortable grip and precise spout.
Shiitake Mushroom Kit
Grow your own delicious shiitake mushrooms at home.
Seed Starting Trays
Perfect for starting seeds indoors before transplanting to your garden.
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 Colwell is in growing zone 5a this means that plants there can survive temperatures as low as -20 to -15 degrees Fahrenheit. Plants for Colwell'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 Colwell 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 Colwell, IA.
The USDA hardiness zone is 5a for Colwell. This is sometimes also referred to as the growing or planting zone. These terms are used interchangeably.
Colwell's Growing Zone Details
USDA Growing Zone: 5a
Longitude: -92.5916
Latitude: 43.1572
Lowest Avg Temperatures (F): -20 to -15
Cluck Around Sign
Whimsical sign for your chicken coop area.
Deluxe Plastic Watering Can
High-capacity watering can with comfortable grip and precise spout.
Rustic Iron Garden Trellis
Sturdy trellis for supporting climbing plants and vines.
Raised Garden Planter
Elevated planter for easy access and better drainage.
Reusable Grow Bags
Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
Map of the Colwell Area
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Raised Garden Planter
Elevated planter for easy access and better drainage.
Shiitake Mushroom Kit
Grow your own delicious shiitake mushrooms at home.
Small Greenhouse Kit
Compact greenhouse perfect for small spaces.
Reusable Grow Bags
Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.
Steel Hori Hori Weeding Knife
Versatile Japanese-style gardening knife for weeding and planting.
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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Stainless Steel Garden Tool Set
Complete garden tool set with heavy-duty stainless steel tools for all your gardening needs.
Raised Garden Planter
Elevated planter for easy access and better drainage.
Metal Seed Storage Box
Organized storage solution for your seed collection.
Fiskars Garden Harvest Basket
Sturdy basket for collecting and carrying your garden harvest.
Brass Watering Can
Elegant brass watering can with classic design and durability.
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