The Mile High Landscape: Monthly Insights
December Edition: Surviving the High-Altitude Winter
Welcome to the inaugural post of The Mile High Denver Landscaper, your monthly guide to keeping your property thriving along the Front Range.
If you are new to Denver, you might think December is simply time to wax the skis and ignore the yard until the tulips poke through. But any seasoned Colorado landscaper will tell you the truth: Winter is the most dangerous season for your landscape.
While the mountains are getting buried in powder, the metro area often faces a dry, freeze-thaw cycle that is brutal on plants. This month, we are breaking down exactly what your property needs right now to survive the altitude and thrive when spring returns.
- The Silent Killer: Winter Drought
In Denver, it’s not the cold that kills plants; it’s the thirst. We live in a high desert climate with extremely low humidity. When we don’t get snow cover, the winter sun and dry winds suck the moisture right out of your lawn and trees.
The Mistake: “Turning off” the yard in October and not watering until May.
The Fix: You must winter water. On days when the temperature is above 40°F and there is no snow on the ground, get the hose out. Your trees—especially evergreens and newly planted saplings—need a drink once or twice a month. This prevents “winter kill,” where the roots dry out and die underground, leaving you with a dead tree in April.
- Sunblock for Trees (Tree Wrapping)
New residents often ask why so many trees in Denver have their trunks wrapped in paper during the winter. It’s not for warmth—it’s for sunburn.
At 5,280 feet, the UV rays are intense, even in December. During the day, the sun warms the dark bark of young, thin-skinned trees (like Maples, Lindens, and Honeylocusts), waking up the cells. When the sun sets and temps drop below freezing instantly, those cells rupture. This is called Sunscald.
The Action: If you have smooth-barked trees planted in the last 2-3 years, wrap the trunks with commercial tree wrap from the base up to the first branches. Keep it on until April to prevent splitting bark.
- Managing the “Chinook” Factor
We all love those random 60-degree days in January, but your plants hate them. These rapid temperature swings (Chinooks) can trick perennials into waking up early, only to be hammered by the next deep freeze.
The Fix: Mulch is critical here. A heavy layer of wood mulch (3-4 inches) keeps the soil temperature consistent. Ironically, in winter, the goal of mulch is often to keep the ground frozen during warm spells so plants stay dormant and safe until true spring arrives.
- Pruning in the Off-Season
While your Kentucky Bluegrass is dormant, your deciduous trees are in the perfect state for structural maintenance. Without leaves, an arborist can clearly see the structure of the tree to remove crossing branches or weak limbs.
This is especially important for heavy snow management. Pruning now reduces the surface area for heavy, wet spring snows (like we get in March) to cling to, preventing those heartbreaking limb snaps that are so common in the Front Range.
- Salt vs. Soil
Denver homeowners use a lot of de-icer on sidewalks and driveways. Unfortunately, standard rock salt (Sodium Chloride) is toxic to plants and lawns. When you shovel that salty slush onto your grass, you are essentially salting the earth, creating dead patches that won’t grow back.
The Solution: Switch to plant-safe de-icers like Magnesium Chloride, or use sand for traction instead. When shoveling, try to pile snow in areas away from your prize shrubs or garden beds if you suspect it contains road salts.
Summary: Don’t Go It Alone
Landscaping in Denver requires a different rulebook than the rest of the country. It’s about battling the dryness, managing the intense sun, and protecting your investment from our famous temperature swings.
If you would rather spend your weekends on I-70 heading to the slopes than dragging hoses around the yard, let us help.
Need a hand with your winter prep?
At DenverProLandscape.com, we connect you with the top-rated, verified landscaping professionals in the Denver metro area. From winter watering services to tree wrapping and pruning, get a quote today and ensure your yard survives the winter.
[Get Your Free Quote Now]
Tune in next month for our January guide, where we’ll tackle planning your xeriscape and choosing drought-tolerant perennials!