– 20 degrees below zero… -50 degrees below zero… -70 degrees below zero …
Yikes.
Every few years, we see some big wind chill numbers across parts of the Rocky Mountain region and high plains during winter, including in Colorado and Wyoming.
With these arctic blasts, it’s natural to wonder:
“Will wind chill kill the plants in my garden?”
The short answer is no.
Wind chill affects humans, not plants. The temperatures that affect your plants are the actual lows, not the wind chill temperatures.
Do you have snow in the forecast? Snow acts like insulation. It can serve as an insulating blanket on the ground, helping protect your plants’ roots from really cold temperatures.
Mid-winter is a better time for cold blasts than spring or fall. No one wants arctic temperatures, but if we’re going to get them, it’s better for our plants to get them in the heart of winter. Most perennials (and shrubs and trees) are in their hardened winter mode by now. Extreme lows can be much more destructive to plants in the spring or fall.
Many plants are “cold hardy” and can tolerate frigid dips.
It will be a wait-and-see game when spring and summer come around to find out if and how plants are affected by this winter’s arctic blast. In the spring, I’ll keep my eye on my “marginally hardy” perennials and newer plants that are still developing their root systems.
But if you hear weather forecasters toss around epic wind chill numbers, don’t let the wind chill numbers alarm you for your garden.
To learn more…
- The University of Nebraska Extension has a good article on the benefits of snow for plants.
- The Michigan State University Extension has a detailed explanation on why wind chill does not affect plants.
Related topics that may interest you:
- 3 plants that struggle in western winters (what not to plant in your Colorado garden)
- “Should I water my garden in the winter in the semi-arid West?”
