Last verified: October 6, 2026, against Denver Water.
Denver’s tree-breaking storm is not ice. It is wet snow, and it arrives in the shoulder seasons rather than the depth of winter. A March or April storm drops snow with the water content of slush onto trees that have already begun to leaf out, and the load per limb is enormous. The same thing happens in reverse in October, when a storm catches the canopy before it has dropped.
Midwinter snow in Denver is usually dry, light and harmless to a well-structured tree. It is the storms on either end of the season — with the leaves on — that fill the emergency calls.
Ash, Siberian elm, and a beetle that changed the math
Denver’s older neighbourhoods lean heavily on green ash, Siberian elm and honeylocust. Siberian elm is brittle at any age. Ash carries a second problem: emerald ash borer reached the Front Range, and an untreated ash is now on a countdown regardless of what the weather does. A structurally compromised ash and a wet spring snow is the most common way a Denver homeowner loses a tree.
The decision worth making before the next storm rather than after it is whether each mature ash is worth treating on a cycle or replacing. Replacing on your schedule costs a fraction of removing on the storm’s.
Winter watering is a real chore here
This is the piece of Front Range landscape care that surprises people who moved from wetter places. Denver is semi-arid, winter is dry, and evergreens and young trees continue to lose moisture through the cold months. Denver Water’s own guidance is to water established plantings during extended warm, dry winter spells — on a day above about 40 degrees, in the middle of the day so the water soaks in before nightfall, with the hose disconnected afterward.
Skipping it is the reason spruce browns from the inside out by March and newly planted trees fail in their first spring. It is also the single cheapest insurance on a young landscape.
Denver Water’s rules come first
Denver Water has prohibited lawn watering and all spray irrigation beginning Oct. 1, until further action by the Denver Board of Water Commissioners. Trees, shrubs and other plants may still be watered with a hand-held hose with an automatic shutoff nozzle or low-volume irrigation, such as a drip line. Check denverwater.org for the current status before setting a controller.
Alkaline clay, and why the amendment aisle matters
Front Range soils are typically heavy, alkaline clay, low in organic matter. High pH locks up iron, which is why maples and some oaks yellow between the veins here while the same tree looks fine in Kansas. Sulphur and chelated iron treat the symptom; compost worked in at planting, and species chosen for alkaline soil in the first place, treat the cause.
Bluegrass is the default lawn and it is thirsty. Where a lawn is not actually used, converting to a planted xeric bed is the change that shows up on a summer bill — and Resource Central runs turf-replacement programs in the metro that make the arithmetic easier.
Hail is the other Front Range problem
The metro sits in one of the most hail-prone corridors in the country, and the June-to-August storms that produce it shred a landscape in minutes. Large-leaved plants take the worst of it — hosta, canna, young aspen — while narrow-leaved and fine-textured plantings come through looking almost untouched.
You cannot prevent hail, but you can plant for it: fine-textured perennials and ornamental grasses in the exposed beds, the tender large-leaved material under the eaves or an established canopy. After a hailstorm, resist cutting shredded foliage back immediately — damaged leaves still feed the plant, and most perennials push clean growth within a few weeks.
The last frost is later than people plant
The metro’s average last spring frost falls around mid-May, and the warm dry week in April that sends everyone to the garden centre is not the signal it appears to be. Tender annuals and vegetables set out before mid-May get replaced most years. Cold-hardy perennials, trees and shrubs can go in far earlier and will establish better for it.
After a heavy wet snow
Do not knock snow off a loaded branch. Frozen wood is brittle and the shock is often what breaks it; the load comes off harmlessly as it melts. Photograph damage before cleanup. Bent-over young trees usually stand back up on their own within a season and rarely need staking. Torn limbs need a clean cut back to the collar so the wound can close.
The rhythm that works: structural pruning in the dormant window before the spring storms, sprinkler blowout in autumn before the first hard freeze, winter watering on the warm dry spells, and a controller reset each spring against that year’s published rules. Running leaf removal, irrigation service and landscape design through one crew keeps the sequence from slipping.
Start with a free quote if you want the ash decision and the watering schedule looked at together. Our service areas page lists the communities we cover across Denver, Jefferson, Arapahoe, Adams and Douglas counties.
Denver reading to notes
Translate the guidance into field checks and documented approval points for the property.