Sunscald is a common form of winter injury that affects many young and thin-barked trees. It typically occurs on the south or southwest side of the trunk when bright winter sun warms the bark during the day, followed by rapid freezing temperatures at night. This cycle can damage bark tissue, leading to cracking, peeling, and long-term stress for the tree.
Sunscald is most common during winter, but it often becomes noticeable in spring or early summer once the damaged bark begins to separate.
Quick Sunscald Prevention Tips
- Wrap young trunks in late fall and remove the wrap in early spring
- Water well going into winter—especially during dry falls
- Mulch 2–3 inches over the root zone, keeping mulch away from the trunk
- Avoid late-season heavy pruning that exposes bark to sudden sun
- Protect stressed trees from borers in early spring if needed
🌡️ When Sunscald Risk Is Highest
Sunscald is most likely to occur when:
- Days are sunny and temperatures rise above freezing
- Nights drop quickly below freezing
- Snow reflects sunlight onto exposed trunks
- Trees are newly planted or have thin, smooth bark
In South Central Kansas, these conditions are especially common in late winter, making sunscald a frequent issue on young landscape trees.
🌳 Trees Most Prone to Sunscald
While sunscald can affect many species, it is most common on:
- Newly planted trees
- Young shade trees
- Thin-barked species such as maples, fruit trees, lindens, and honeylocust
Trees that have recently been pruned heavily or suddenly exposed to more sun are also at higher risk.
🛡️ How to Prevent Sunscald
Trunk Wrapping
Wrapping tree trunks is one of the most effective ways to prevent sunscald:
- Use a breathable tree wrap or light-colored material
- Wrap from the base of the trunk up to the first set of branches
- Apply in late fall and remove in early spring
Proper wrapping helps reflect sunlight and moderates temperature fluctuations in the bark.
Watering, Mulching, and General Tree Health
Healthy trees are better able to tolerate environmental stress:
- Water trees thoroughly before the ground freezes
- Apply a 2–3 inch layer of mulch around the base (keep mulch away from the trunk)
- Avoid excessive pruning late in the season
Good establishment practices help trees develop thicker bark and stronger defenses over time.
🧠 Why Prevention Matters
Sunscald damage does not heal quickly. Cracked or dead bark can:
- Weaken the tree’s structure
- Provide entry points for insects and disease
- Reduce overall vigor and growth
Preventive steps are far easier and more effective than dealing with long-term damage.
🔗 Already Have Sunscald Damage?
If your tree is already showing signs of sunscald, proper care is important to avoid further injury and help the tree recover naturally.
Visit our guide on how to treat sunscald on trees for steps to take when damage has already occurred.