By Nancy Penrose
As the days grow shorter and temperatures begin to drop, most homeowners start thinking about cozy indoor activities, like getting the fireplace ready, not about what’s happening out in the yard. But before winter sets in, your trees could use a little extra attention.
Just like people, trees can struggle in harsh winter conditions. Cold temperatures, drying winds, heavy snow, and ice can take a toll on even the healthiest specimens. Fortunately, a bit of preparation in autumn can make all the difference in keeping your trees strong and thriving when spring arrives.
Here’s a step-by-step guide on how to best prepare your trees for winter, protecting them from damage, stress, and disease while promoting long-term health and growth.
1. Start with a Health Check
Before you begin any winter prep, take a close look at your trees. Are there dead branches, cracked limbs, or signs of disease? These can become dangerous in winter storms, when high winds and heavy snow can cause breakage.
Inspect the following:
- Branches: Look for dead, broken, or rubbing branches.
- Trunk: Check for cracks, peeling bark, or evidence of pests.
- Roots and base: Make sure there are no signs of rot or fungus.
If you find major problems or suspect disease, consider calling a certified arborist. Catching and addressing issues early will prevent small problems from turning into big ones over the winter.
2. Prune with Purpose
Late fall is one of the best times to prune most deciduous trees. Once the leaves have fallen, it’s much easier to see the tree’s structure and identify which branches need to go. Pruning at this time also reduces the risk of disease transmission from insects, since most are dormant in cold weather.
Here’s how to prune correctly:
- Remove dead, damaged, or diseased branches first.
- Cut back any limbs that cross or rub against each other.
- Avoid heavy pruning or topping. You don’t want to stress the tree before winter.
Always use clean, sharp tools, and make cuts just outside the branch collar (the slightly raised area where the branch meets the trunk). Proper pruning improves air circulation, reduces the risk of breakage from snow and ice, and helps your tree start strong in the spring.
3. Give Your Trees a Good Drink
One of the biggest threats to trees in winter isn’t the cold, it’s dehydration. As the ground freezes, roots have a harder time absorbing water. Meanwhile, dry winter winds continue to pull moisture from branches and needles.
That’s why watering deeply before the ground freezes is so important. In late fall, give your trees a thorough soaking to ensure the root zone is well hydrated. This is especially vital for young trees, evergreens, and those planted within the past few years.
To water effectively:
- Place a slow-running hose at the base of the tree for 30–60 minutes.
- Focus on the area under the canopy, where most roots are located.
- Avoid watering when the temperature is below freezing or if the soil is saturated.
Moist soil retains heat better than dry soil, which can actually help protect the roots from extreme cold.
4. Apply Mulch for Insulation
Mulch acts like a warm blanket for your tree’s roots. It helps regulate soil temperature, retain moisture, and prevent frost heaving (when freeze-thaw cycles push young roots out of the ground).
Here’s the right way to mulch:
- Spread a 2–4 inch layer of organic mulch, such as wood chips, bark, or shredded leaves, around the base of the tree.
- Extend the mulch out as far as the tree’s drip line if possible.
- Keep mulch a few inches away from the trunk to prevent rot and pest infestation.
Mulching in late fall, after the first hard frost, locks in moisture and adds an extra layer of protection during temperature swings.
5. Protect the Trunk from Cracking and Critters
During winter, the sun can heat the tree’s bark during the day, causing the cells to expand. When temperatures drop rapidly at night, those same cells contract — often resulting in vertical cracks known as frost cracks.
You can prevent this by wrapping the trunks of young or thin-barked trees (such as maples, crabapples, and fruit trees) with tree wrap or light-colored paper. Start at the base and wrap upward to the first branches, securing with tape or twine. Remove the wrap in early spring once the threat of freezing has passed.
Tree wraps also help protect against animal damage. In winter, hungry rodents, rabbits, and deer often gnaw on bark when food sources are scarce. Plastic tree guards or hardware cloth around the base can deter them effectively.
6. Don’t Forget Young Trees
Newly planted trees are especially vulnerable to winter stress. Their root systems are still developing, and they can easily dry out or heave out of the soil during freeze-thaw cycles.
To help young trees survive their first winters:
- Stake them securely if they’re in windy areas.
- Water consistently until the ground freezes.
- Mulch generously and protect the trunk from frost and animals.
A little extra care now will help ensure your young trees grow into healthy, established specimens in the years to come.
Final Thoughts
Winter can be a tough season for trees, but with the right preparation, they’ll emerge in spring stronger than ever. A few simple actions: pruning, watering, mulching, and protecting, can make all the difference in preventing damage and promoting deep, healthy root growth.
Think of your fall efforts as an investment. The trees you care for now will repay you with beauty, shade, and cleaner air for decades to come. So before you retreat indoors for the season, take a few hours to prepare your trees for winter, and give them the best possible start for the year ahead.
Nancy Penrose is the owner of Big Trees Inc., located in Snohomish, WA in the Seattle area. The company is one of the largest tree nurseries in the Seattle area with over 120,000 trees available in over 300 varieties. They not only deliver young trees, but also mature trees in a wide range of sizes. Some types of trees available include fall color, spring flowering, deciduous, evergreen, and privacy trees. The company also does tree transplanting including large trees. Their blog can be seen at https://bigtreesupply.com/blog/ or http://arboristblog.com/. They can be reached at 360-563-2700.
Big Trees Inc.
10928 Springhetti Rd
Snohomish, WA 98296
360-563-2700
