Key Points:
- Late fall into winter, when trees are dormant, is the optimal window for the major pruning and preventive maintenance needed to keep your trees healthy year-round.
- Dormant season tree care isn’t just about aesthetics. It also reduces disease and pest risk, mitigates winter storm damage, and sets your trees up for vigorous spring growth.
- Hiring an ISA-certified arborist to perform dormant season tree care helps homeowners save money and avoid the backlog that hits tree care companies come spring.
Once the leaves drop, many Western Maryland homeowners stop thinking about their trees until spring comes back around. But just because your trees aren’t actively growing during the late fall and winter doesn’t mean you should forget about them. In fact, the dormant season is an ideal time to do the strategic pruning and preventive maintenance that will help set the stage for healthy spring growth.
In this guide, we’ll dive into the details of tree dormant season to learn what it is, when it happens, and why it’s a crucial time of year for tree care. You’ll also learn what steps to include in your seasonal tree care plan and when to consider hiring a professional.
Understanding Tree Dormant Season
Trees have a variety of adaptations that enable them to survive in different environments. In temperate climates, for example, deciduous trees enter a dormant state during the colder months. They drop their leaves and stop actively growing to conserve as much energy as possible, essentially lying in wait until temperatures rise in spring.
In Western Maryland and South Central Pennsylvania, the first hard frost typically marks the start of the dormant season for trees. Though the leaves may begin to change as early as September in some areas, they don’t tend to drop until mid-to-late October in Western and Central Maryland. Declining temperatures leave many trees bare by mid-November, at which point they enter a period of dormancy that lasts through early-to-mid March when the spring buds start to break.
Factors like elevation and yearly weather patterns can impact the timing of the dormant season. For example, trees may go dormant earlier at high elevations in the Blue Ridge Mountains of Frederick and Carroll Counties. A particularly dry summer or early autumn drought could also cause trees to drop their leaves early.
While the dormant season is perfect for tree maintenance, plan to wait a few weeks after the leaves drop to break out the pruning shears. Properly timing your seasonal tree care is crucial.
How To Tell Your Trees Have Gone Dormant
If your trees are in need of structural pruning or significant maintenance, it’s best to wait until they’ve gone dormant. Pruning involves removing stems or branches, which can be stressful for the tree. By waiting until the tree has gone dormant, you can improve its chances of recovery since the resources needed for healing aren’t currently being used elsewhere.
Not sure whether your trees have gone dormant yet? Here are a few signs to look for:
- Most of the leaves on the tree have already changed color or fallen off.
- Your area has already experienced a hard frost (air temperature below 28℉ (-2℃) for at least four hours).
- Any buds on the tree are constricted and tightly closed.
- There’s no evidence of active growth, such as new shoots or elongating stems.
- The flow of sap has slowed significantly (particularly in maple, birch, and walnut trees).
The ideal pruning window for most shade and ornamental trees is late winter, after the coldest part of the season has passed but before buds open in early spring. In Maryland, that usually means between late January and early March.
Keep in mind that pruning recommendations for flowering trees may differ. Trees that flower on new wood in the summer or early fall, such as smoke tree and crape myrtle, should be pruned while the tree is dormant. Trees that develop flowers on old wood (such as dogwood, crabapple, and magnolia), however, should be pruned right after flowering in the spring.
5 Benefits of Dormant Season Tree Maintenance
Whether you have one towering white oak as the centerpiece of your yard or a veritable forest of tulip poplars, red maples, and hickory surrounding your property, regular maintenance is a must if you want to keep your trees happy and healthy. Winter is the perfect time to do it, too, while the trees are dormant and there’s no foliage to get in the way.
Here are some of the top reasons to enact an annual dormant season tree maintenance plan.
Encourage Strong Spring Growth
Regular pruning is crucial for removing dead or damaged branches and for thinning out areas of dense growth to let sunlight in and air flow freely. It’s also a way of shaping the tree to better suit your space while preventing it from wasting resources on unwanted shoots and branches.
Pruning during the winter causes less physiological stress than spring or summer pruning while the tree is actively growing. When trees go dormant, they funnel all their energy into the root system for storage instead of expending it on leaf production or flowering. This means it can direct all of its resources to quickly healing the wounds left by pruning cuts. By spring, the tree will be recovered and ready to put all its energy toward new growth.
Control Pests and Disease
For a tree, fresh pruning cuts are like open wounds. When insect activity peaks in spring and summer, those wounds are highly vulnerable to bacterial pathogens, fungal spores, and borer insects. Waiting until winter to prune your trees is one of the simplest but most effective ways to mitigate pest and disease risks.
Oak wilt and Dutch elm disease are primary examples in Maryland and Pennsylvania. Both diseases are spread through insect vectors, so waiting to prune trees until pest activity slows in winter can significantly reduce the risk of spread.
Easily Identify Structural Issues
Pruning isn’t just about making a tree look better; it’s also about improving its strength and structural integrity. To develop a pruning plan, however, you need to get a good look at the trunk, bark, and branches. This can be hard to do when the tree is covered in foliage, which makes the dormant season the best time to perform a risk assessment.
When the leaves are gone, an arborist can clearly see the tree’s shape, look for structural defects, and evaluate the entire architecture of individual branches. It’s also the best time to spot dead or dying limbs. Without the camouflage of foliage, the differences between live and dead wood become more visually distinct.
Reduce the Risk of Winter Storm Damage
Winters in Maryland and Pennsylvania can be harsh, often bringing ice storms, high winds, and heavy snows. Severe weather can put enormous stress on the healthiest of trees. If a tree is already damaged or structurally compromised, it becomes an even greater risk with each storm that rolls through.
Being proactive about dormant-season pruning helps reduce the risk of branches falling onto your power lines, roofs, vehicles, or fences. It can also reduce wind resistance from overgrown canopies (known as the sail effect), which can uproot entire trees during high-wind events.
Save Time and Money
Severe weather doesn’t always come with an advanced warning, so preparation is often the best form of protection. Planning structural pruning and other annual tree maintenance for the late fall or early winter gives you access to the most flexible scheduling and competitive pricing, since service crews are less likely to be stretched thin by emergency calls.
In other words, addressing minor issues in the off-season helps reduce the chances of needing emergency removal or storm cleanup at a time when demand is high, and prices are at a premium.
What Should Dormant Season Tree Care Look Like?
Dormant season tree care is just as much about preventing minor issues from becoming major safety concerns as it is about protecting your trees for the future. As such, a comprehensive winter tree care plan should include pruning, soil improvement, and protection against winter elements.
Let’s take a quick look at each of these areas and what to focus on in each.
Dormant Season Pruning
A little pruning every winter helps establish a strong foundation for healthy growth and development. Structural pruning, which involves establishing or correcting the tree’s permanent branch framework, may not be an annual requirement but is very important for young trees. As the tree matures, occasional hazard pruning may also be needed to remove weak, diseased, dead, or dying branches.
Even if your trees don’t need any major work done, they can still benefit from maintenance and aesthetic pruning. Maintenance pruning typically involves thinning or raising the crown to maintain its health, as well as removing branches that might interfere with power lines, traffic, or line of sight. Aesthetic pruning involves shaping the tree for appearance more than health or structure.
Soil Improvements
Pruning is geared toward the above-ground parts of the tree while soil improvements target the root system. There are three primary areas to consider: mulching, watering, and soil testing.
You may already understand the importance of spring mulching to help keep your landscaping lush through the summer, but winter mulching is another must. Mulch protects the roots from temperature swings and helps retain soil moisture. The Arbor Day Foundation recommends spreading a layer of mulch two to four inches thick around the base of the tree (without touching the trunk), extending to the edge of its crown.
To keep your trees hydrated over the winter, water slowly and deeply near the dripline. Water during the daytime, only when the ground isn’t frozen and the air temperature is above 40℉. You may also want to test your soil to determine whether you need to make any pH or nutrient level adjustments come spring.
Protection Against Winter Elements
Finally, take some time to protect your trees against harsh winter elements. If you have any young or newly planted trees, consider installing windbreaks or stakes to help safeguard them against strong winter winds. Wrapping thin-barked trees in breathable burlap can also help reduce frost damage and sunscald.
Don’t forget that Maryland wildlife can also pose a threat to your trees, especially when they’re new. Deer, rabbits, and other animals may damage the trunk or lower branches, exposing the vulnerable inner bark to disease. If fencing around the tree isn’t a viable option, you can loosely wrap the trunk instead. Just be sure to remove it in spring to avoid trapping moisture around the base of the tree.
At Baker Tree Services, our certified arborists can help you develop a winter tree care plan. We offer antidesiccant sprays to help prevent winter burn, deer repellent to protect against trunk damage, and tree cabling to help stabilize injured or leaning trees.
Create a Custom Care Plan with Baker Tree Services
Performing safe and effective dormant season tree care requires a professional touch. Baker Tree Services has been providing expert, personalized tree care to Maryland homeowners and businesses for over thirty years. Our arborists are certified by the International Society of Arboriculture (ISA) and follow pruning practices recommended by the American National Standards Institute (ANSI) to protect the health and maintain the natural beauty of every tree on your property.
From risk assessments and pest management plans to seasonal pruning and emergency tree removal, we’re committed to serving the needs of homeowners in Maryland and Pennsylvania.
Our service areas include:
- Adams County
- Carroll County
- Franklin County
- Frederick County
- Montgomery County
- Washington County
To schedule a consultation for tree care services or learn more about our service care plans, contact us online or call 240-288-7223.
FAQs
When do trees go dormant in Maryland?
Trees in Maryland and Pennsylvania typically go dormant by mid-to-late November, depending on elevation and local weather patterns. Deciduous trees dropping their leaves is generally a sign of dormancy, though some species (like certain oak species) may hold onto their dead leaves through the winter.
Do I need to water my trees during the fall and winter?
Watering your trees through the fall until the ground freezes helps keep the roots hydrated and protected through the winter. Regular watering is particularly important for newly planted trees and evergreen varieties, which continue to develop roots even when there’s little visible above-ground growth. Water your trees at midday when the air temperature is above 40℉, targeting the dripline and avoiding the ground right around the trunk.
Should I hire a professional or perform fall tree maintenance myself?
Minor tree maintenance tasks, such as removing small branches and spreading mulch, are DIY-friendly for the average homeowner. More involved tasks like structural pruning, hazard assessment, and tree removal should be handled by an ISA-certified arborist to protect both tree health and personal safety.
Is fall and winter tree care more affordable than spring tree service?
In many cases, scheduling tree care services during the fall and winter offers greater availability and cost predictability. Tree care companies typically see peak demand in spring, which can mean longer wait times and higher emergency pricing for homeowners.