Common Signs a Certified Arborist Looks for When Assessing Dangerous Trees
How to Tell If a Tree Is Dangerous—and Why You Shouldn’t Wait to Call a Certified Arborist
Tree failure is one of the most dangerous and expensive hazards homeowners can face—especially in storm-prone seasons. A single overlooked limb or weakened trunk can result in thousands in damage, personal injury, or legal liability. The real danger isn’t just visible decay—it’s the hidden structural issues that most property owners don’t know to look for. A Certified arborist can identify these risks before they escalate.
White Oak Tree Care Inc., a top-rated arborist team in DuPage and Kane County, has helped local homeowners prevent these problems since 2014. Our ISA-Certified Arborists specialize in identifying risks before they turn into emergencies. With the right approach to tree removal and tree trimming, you can keep your trees healthy—and your property protected.
If you’ve noticed leaning, dead limbs, or root damage, you may already be dealing with a high-risk tree. Here’s what you need to know about warning signs, expert assessment, and when to take action before summer storms roll in.
Common Warning Signs of a Dangerous Tree
Some trees decline gradually. Others fail without warning. Knowing what to look for helps homeowners act before it’s too late.
Leaning or Unstable Growth
Sudden leaning is rarely natural. It often signals root failure or soil erosion after storms.
- Leaning greater than 15 degrees may indicate a failing root system.
- Heaving soil or exposed roots on the opposite side of the lean shows instability.
- Trees that lean toward structures, driveways, or walkways are especially hazardous.
💡 Helpful Tip: Check whether the lean is new or worsening. Use nearby buildings or fences for reference.
Cracks or Splits in the Trunk or Major Branches
Splits can weaken structural integrity, especially near branch junctions or at the base.
- Cracks that extend deep into the trunk often accompany internal decay.
- “Co-dominant stems” (two trunks growing together) often split without warning.
- Ice, snow, and strong winds worsen existing cracks.
💡 Fact: Vertical trunk cracks are common precursors to storm failure and should be evaluated as part of a tree risk assessment.
Dead or Falling Branches (a.k.a. Widowmakers)
Dead limbs fall silently, especially in windy conditions.
- Large, dry, brittle limbs high in the canopy are called “widowmakers.”
- Trees self-shed branches that are diseased or light-deprived.
- Branches with peeling bark, no buds, or hollow interiors are considered dead.
💡 Helpful Tip: Spot dead limbs early by comparing leaf growth during spring. Addressing them early supports tree longevity and reduces the need for full tree removals.
Root Issues or Exposed Roots
Roots anchor and nourish the tree. When they’re compromised, the tree becomes unstable.
- Look for mushrooms near the base, especially conks or shelf fungi.
- Soft, decayed wood at the base is a sign of root or butt rot.
- Shallow, exposed roots can dry out or become damaged by lawn equipment.
💡 Pro Tip: Avoid piling mulch against the trunk. It traps moisture and causes decay, increasing the risk of hazardous tree signs going unnoticed.
Hollow Trunks or Cavities
A hollow trunk can’t hold up weight—even if the tree still produces leaves.
- Trees with hollow centers lose strength, especially in wind.
- Cavities often develop after improper pruning, storm damage, or decay.
- Internal decay spreads from the inside out.
💡 Fact: If 30% or more of the trunk is hollow, a certified arborist will often recommend removal.
If your tree shows visible cracks or unusual leaning, don’t wait for it to worsen. Contact White Oak Tree Care Inc. for a fast, professional tree risk assessment by a certified arborist. We’ll evaluate it safely and recommend the right next step—before a small issue becomes a costly one.
What Makes DIY Tree Diagnosis So Risky?
Tree risks are complex. Most dangers are hidden or misinterpreted without formal training.
Homeowners Often Miss Subtle Signs
Decay, pests, and instability aren’t always visible.
- Leaf discoloration or thinning may indicate root or vascular disease.
- Cankers (sunken, dying areas on bark) suggest disease or injury.
- Epicormic sprouts (random shoots on the trunk) indicate stress.
💡 Helpful Tip: If anything about your tree “feels off,” call an expert. Your instincts may be catching early hazardous tree signs before they escalate.
Untrained Decisions Can Cause More Harm
Improper pruning leads to decay and destabilization.
- Topping a tree causes weak, fast-growing branches prone to breaking.
- Cutting too close to the trunk leaves open wounds that attract pests.
- Removing too much live tissue at once stresses the tree.
💡 Pro Tip: Avoid removing more than 25% of a tree’s canopy without consulting a certified arborist.
Legal and Safety Risks of Handling Tree Work Alone
DIY tree work is physically dangerous and legally risky.
- Falls from ladders or chainsaw injuries are common homeowner accidents.
- If a falling branch hits a neighbor’s property, you may be liable.
- Incorrect tree removal can damage driveways, roofs, and nearby trees.
💡 Fact: Certified professionals follow ANSI Z133 safety standards and carry full liability insurance. Only professionals with proper insurance and credentials should perform high-risk jobs like emergency tree removal.
Why Certified Arborist Tree Risk Assessments Are Essential?
A tree that looks fine can still be structurally unsound. Risk assessments by a certified arborist give you clarity.
What Arborists Evaluate (Beyond the Obvious)
Certified arborists assess the whole tree system—not just visible limbs.
- Soil compaction and drainage issues that affect root health
- Tree species growth patterns and structural limitations
- Past pruning wounds and storm damage
- Signs of insect infestation or fungal infection
💡 Helpful Tip: Every arborist inspection includes both visible and hidden issues that impact stability and safety.
Tools and Techniques Used by Pros
Pros don’t guess—they measure and test.
- Sonic tomography maps internal decay using sound waves.
- Resistograph drills measure wood strength with minimal damage.
- Drones safely assess large or tall trees without climbing.
👉 See how professional storm damage response can prevent structural disasters.
💡 Pro Tip: These tools provide fast, data-backed results—especially after storms.
How Experts Decide on Pruning, Removal, or Support Systems?
Not all dangerous trees need removal. Arborists weigh options.
- Tree trimmings reduce weight on overextended limbs.
- Cabling/bracing supports weak branch unions or splits.
- Tree removals are used for irreversible decay or high-risk proximity to people or property.
💡 Fact: Professional input ensures tree safety while preserving the tree when possible.
Protect your home and your peace of mind—call White Oak Tree Care Inc. at (630) 520-2690 or Get a quote online. Whether it’s emergency tree removal, preventive tree trimming, or a thorough arborist inspection, our certified team is ready to help you act before damage happens.
When Emergency Tree Removal Is the Only Safe Option
In some cases, action cannot wait. Delay increases danger and liability.
Signs That Require Immediate Action
Certain symptoms mean the tree is beyond saving.
- Sudden lean after storms
- Heavy limb shedding or trunk splitting
- Trees uprooting or with major cracks near the base
💡 Helpful Tip: If the tree threatens your home, power lines, or driveway, call for emergency tree removal right away.
Fast Response Prevents Costly Damage
Acting early prevents thousands in repair costs and protects loved ones.
- Delaying removal increases storm risks.
- Insurance claims often require professional documentation.
- Downed trees can damage water lines, HVAC units, and electrical panels.
💡 Pro Tip: Document issues with photos before removal. Get a written arborist inspection if you plan to file a claim.
How a Certified Arborist from White Oak Tree Care Can Help You Act Early?
Since 2014, White Oak Tree Care Inc. has helped homeowners across DuPage and Kane County prevent damage, extend tree life, and improve property safety. Our team provides:
- ✅ Tree risk assessments
- ✅ Emergency tree removal
- ✅ Preventative tree trimmings
- ✅ Expert arborist inspections
Every service is performed by an ISA Certified arborist trained in structural diagnostics, tree biology, and modern safety protocols. Whether you’re dealing with storm damage or long-term decay, our inspections are thorough, and our advice is always based on your tree’s safety, health, and long-term stability.
Don’t Wait for Trouble to Fall—Call a Certified Arborist Today
Dangerous trees often give off subtle signs—don’t ignore them. Cracks in the trunk, dead branches, exposed roots, and sudden leaning can all indicate a serious safety risk. The longer these issues are left unaddressed, the greater the chance of costly damage or injury. A Certified arborist can identify the safest and most affordable course of action.
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