Winter Tree Damage Prevention Guide

Massachusetts winters break trees. Between December and March, our crew at McDonald Tree Service responds to more emergency calls than the rest of the year combined. Ice storms, heavy wet snow, nor'easter winds, and freeze-thaw cycles cause millions of dollars in tree damage across Middlesex County every winter. Most of that damage is preventable with proper preparation.

I am Keith McDonald. My crew has been doing storm damage cleanup and winter tree work across Billerica and our 18-town service area since 1995. Here is how to protect your trees before the damage happens, and what to do when it does.

How Ice Storms Damage Trees

Ice is the worst. A half inch of ice accumulation adds 500 pounds of weight to a typical medium-sized tree. An inch of ice can add over a ton. That is weight the tree was never designed to carry, applied to branches that are cold, brittle, and inflexible.

The trees most vulnerable to ice damage in our area:

• White birch: Thin, flexible trunks that bend under ice and often do not spring back. We see bent birches after every ice storm in Concord and Lincoln.
• Pin oak: Fine branching structure that catches and holds ice. Heavy ice storms shatter pin oaks.
• Bradford pear: Weak branch attachments that split apart under any loading. If you still have one, it is going to fail eventually.
• White pine: Tall, heavy canopies that become top-heavy with ice, leading to trunk snapping or uprooting. Read our white pine problems guide for more.

Snow Loading: The Silent Killer

Heavy wet snow is almost as destructive as ice. A foot of wet March snow on a broadleaf evergreen like a rhododendron or arborvitae can crush it flat. On deciduous trees, snow accumulates in the crotches of branches and at weak attachment points, creating leverage that rips branches off the trunk.

What you can do:

• Gently brush snow off evergreen branches with a broom, sweeping upward from below. Do not shake the tree or hit branches. Cold wood is brittle.
• For arborvitae and multi-stemmed evergreens, loosely tie the stems together in late fall with soft rope or burlap strips to prevent splaying under snow.
• Do not try to remove ice from branches. Let it melt naturally. Trying to knock ice off cold branches causes more breakage than the ice itself.

Preventive Pruning Is Your Best Defense

The number one thing you can do to prevent winter tree damage is get your trees properly pruned before winter arrives. This means:

Remove deadwood: Dead branches are brittle and will fail first under any loading. Getting them out of the tree before winter eliminates the easiest targets for storm damage. A branch that falls from 40 feet has enough energy to go through a car windshield.

Reduce end weight: Long, heavy horizontal branches act as levers in wind and under ice loading. Selective reduction pruning shortens these branches and removes weight from the ends, which dramatically reduces the chance of failure.

Fix weak attachments: Co-dominant stems with included bark are the most common structural failure point in trees. These can be identified in fall when leaves are off, and either pruned to reduce the risk or supported with cabling and bracing systems.

We recommend scheduling your preventive pruning in October or November. Check our fall tree maintenance tips for a complete pre-winter checklist.

Road Salt Damage

Road salt is an overlooked cause of tree damage in Massachusetts. Sodium chloride applied to roads and driveways gets into the soil, where it dehydrates roots and disrupts nutrient uptake. It also sprays directly onto trunks and branches from passing traffic, burning bark and buds.

Trees most affected by salt damage in our service area:

• White pines along roads, which show brown needle tips and canopy thinning on the road-facing side
• Sugar maples in the planting strip between the road and sidewalk
• Hemlocks near heavily salted intersections

We see significant salt damage along Route 3A in Billerica and Burlington, along Route 38 through Tewksbury and Wilmington, and on heavily salted residential streets throughout Lowell and Chelmsford.

Mitigation strategies:

• Use calcium chloride or magnesium chloride instead of sodium chloride on your own driveway. They are less toxic to trees.
• Create a burlap barrier between the road and vulnerable trees to block salt spray
• In spring, flush the soil around road-adjacent trees with heavy watering to leach out accumulated salt
• When planting near roads, choose salt-tolerant species like black cherry, red oak, or eastern red cedar

Frost Cracking and Sunscald

Frost cracking happens when the south or west side of a tree trunk warms in winter sunshine, then temperatures drop rapidly after sunset. The bark cells that expanded in the warmth contract violently, and the trunk splits vertically. This is common on thin-barked species like maples, birches, and fruit trees, especially young trees with no canopy shading the trunk.

Prevention is simple: wrap the trunks of vulnerable young trees with commercial tree wrap in November. Remove the wrap in April. For mature trees, there is not much you can do. Frost cracks on large trunks usually compartmentalize and are not life-threatening, but they create entry points for decay organisms. Monitor them annually.

After the Storm: What to Do

When a winter storm damages your trees, safety comes first:

• Stay away from downed power lines. If a tree takes down a wire, call the utility company first. Do not approach the tree.
• Do not stand under a damaged tree. Hanging branches can release without warning, especially as ice melts.
• Call a professional for anything overhead. Chainsaw work above your head is how people get killed. If a branch is hanging in the canopy, call us.
• Document damage for insurance. Take photos before any cleanup starts.

For trees with minor branch loss (less than 25 percent of the canopy), proper pruning can clean up the damage and the tree will recover. For trees that have lost major limbs, split trunks, or been uprooted, removal is usually the only safe option. Read our guide on when to remove a tree for help making that decision.

Emergency Storm Damage Service

McDonald Tree Service provides 24/7 emergency storm damage response across all 18 towns in our service area. When a nor'easter drops a tree on your house at 3 AM, we answer the phone. We have the crew, the equipment, and 30 years of experience handling the worst Massachusetts winters can throw at us.

Call (978) 375-2272 any time, day or night. We serve Billerica, Chelmsford, Lowell, Tewksbury, Wilmington, Burlington, Bedford, Carlisle, Dracut, Westford, Andover, Woburn, Lexington, Concord, Lincoln, Winchester, Acton, and Waltham. For preventive pruning, call before winter hits. For emergencies, call anytime.