Hardiness Zone Map Changes: What Montanans Need To Know

Plant Hardiness Zones Are Changing In Montana

NPR reported back in November, that the USDA had updated the hardiness zone map for the first time in 10 years.  Gardeners all over the state collectively yelled, "I knew it!"

What Is A Hardiness Zone?

Gardeners use it to figure out what they can plant in the area they live in.  In Montana, I grew up with a Hardiness Zone of 4. From the USDA:

"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"

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Things Are Heating Up All Over The World, Extending Growing Seasons

Scientists estimate that 2023's hardiness zone map is about two and a half degrees warmer than it was in 2012.  That doesn't sound like a lot, but if you are a believer in math and science, you know it is.  If you don't believe in math and science, I'm not quite sure how to explain it.  Just know it's hotter.

The Hardiness Zone Map of America, 2012

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The Hardiness Zone Map Of America, 2023

It makes a big difference in how long the growing season is, so plants have more time to mature. Due to a longer season, there are more plants for you to choose from.

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Just What Kind of A Difference Does One Zone Make?

When you're talking super cold to kind of cold, not as much as if you went to a totally tropical climate, but, there is more to choose from when planning your garden.  One of the old standards for gardeners all over the world, Brecks, has a nice breakdown of Zone 4 and Zone 5. Take a peek at the difference, and get to planning your 2023 garden.