How to Perform a Tree Risk Assessment

A tree can look healthy and still have a weak root system, split trunk, or dangerous limb. A proper tree risk assessment looks at the tree and what could be damaged if it fails.

We’ll show you how to inspect a tree safely, judge the danger, document what you find, and decide when to bring in All Wood’s Tree Service, Inc. for help.

Step 1: Identify the Tree, Site, and Immediate Warning Signs

The first part of a tree risk assessment is a site check. Start from the ground, keep people away from the tree, and note the weather and recent events.

Write down the tree’s location. Give it a simple ID, such as T-01. Note the species if you know it. Estimate its height and canopy spread, but mark estimates as estimates. Record the date and explain why you’re checking it.

Next, look at the area around the tree. A tree becomes a serious concern when a weak part can reach a target. Targets include people, homes, cars, sidewalks, play areas, fences, sheds, and utility lines.

Walk back far enough to see the full tree. Look for these early warning signs:

• A new or worsening lean
• Soil that has lifted or cracked near the base
• Large dead limbs over a roof, driveway, or walk
• A fresh crack in the trunk or a branch union
• Broken limbs left after wind or heavy snow
• Mushrooms or conks near the root flare
• Sudden thinning, dieback, or early leaf color

Northern Utah trees face snow load, strong wind, drought stress, and freeze-thaw cycles. Recent construction or trenching can also cut key roots. Regular inspections and added checks after major weather events can help identify changes. Consider a qualified consultant or certified arborist when a tree may threaten people or property.

For a local warning-sign checklist, our guide to tree risk assessment warning signs in Weber County covers root damage, trunk defects, canopy decline, and nearby targets.

Stop the inspection and get professional help if the tree has a fresh lean, a split that shows daylight, a hanging limb over an active area, or contact with a power line. Don’t climb the tree or stand beneath a suspect limb to get a closer look.

By now, you should have a tree ID, a site sketch or set of notes, a list of targets, and a first record of visible warning signs.

Step 2: Inspect the Roots, Trunk, Branches, and Canopy

A useful tree risk assessment follows the same path each time. Move from the roots upward so you don’t miss a defect hidden at the base.

Check the root zone first

Look at the root flare, which is where the trunk widens into the main roots. Watch for exposed roots, soil movement, decay, cuts, and roots wrapped around the trunk. Also note standing water, compacted soil, recent grading, or paving that covers the root zone.

Roots need room, air, water, and stable soil. Damage to major roots can affect both tree health and tree stability. A tree beside a new patio or utility trench needs closer review, even if the canopy still looks full.

Inspect the trunk

Walk around the whole trunk. Look for vertical cracks, cavities, loose bark, dead sections, old wounds, wet spots, and fungal growth. Check whether two stems meet with a narrow, weak union. Included bark, where bark grows between joined stems, can make that union more likely to split.

Don’t treat one sign as a final answer. A cavity does not tell you how much sound wood remains. Mushrooms near the base can point to decay, but they don’t prove that failure is about to happen. Record what you can see, then leave deeper testing to a trained professional.

Review branches and canopy

Scan the main limbs for deadwood, hanging branches, cracks, rubbing limbs, and weak forks. Look for branches with heavy end weight or long horizontal growth. Note whether the canopy is thin on one side or has dead tips.

Use binoculars if you have them. Do not use a ladder for this inspection. A ground check has limits, and we can’t see every defect from below.

Take wide photos first. Then take closer photos of each defect. Include the tree ID in your notes. A close-up of a crack without its location tells another person very little.

Our crew at All Wood’s Tree Service, Inc. uses this same ground-first mindset before recommending trimming, support work, treatment, or removal. The goal is to match the work to the defect. A tree with one hazardous limb may need structural pruning, while a tree with root failure may need a much more urgent plan.

By now, you should have notes for the roots, trunk, branches, and canopy, plus photos that show where each concern sits.

Step 3: Evaluate What Could Be Hit and How Serious the Damage Could Be

Tree risk assessment is about more than tree condition. We also need to ask what could be hit, how often it is occupied, and what the result could be.

Start with the likely fall or drop zone. For a whole tree, inspect an area at least as wide as the tree is tall. For a branch, focus on the places that branch could reach. A limb over an empty slope creates a different concern than the same limb over a bedroom, sidewalk, or parking stall.

Now assess three separate questions:

1. How likely is failure? Look at defects, decay signs, root damage, lean, branch structure, and recent loads from snow or wind.
2. How likely is impact? Consider the target’s location and how often people or vehicles are present.
3. How serious could the result be? A small branch may damage a fence. A large trunk may damage a roof, block access, or injure someone.

Use a short time frame in your notes. For example, state that you’re judging conditions over the next year. Risk can change after a storm, excavation, pest issue, or major pruning job.

A structured risk review considers failure likelihood, impact likelihood, and consequences. Risk ratings can vary between assessors. That’s one reason we treat a home inspection as a screening step, not as a formal professional rating.

Close or block a target when you can do so safely. Move a picnic table. Park elsewhere. Keep children away from the area. For a business, HOA, or rental property, tell staff and residents which area is closed.

A risk review should also consider the tree’s value. Removal may solve one hazard, but pruning, cabling, bracing, irrigation changes, or plant health care may reduce risk while keeping the tree. The safest choice depends on the defect, the target, the site, and your acceptable level of risk.

If you manage a commercial property before a sale or lease, keep the tree record with the rest of your property files. Owners handling a broader real estate transaction may also need to review 1031 exchange requirements for property owners, though tree records and tax rules are separate matters.

By now, you should have a clear failure scenario. Write it in plain words, such as “large east limb may fall toward the occupied driveway during high wind.”

Step 4: Assign a Usable Risk Level and Document Your Findings

A home tree risk assessment needs a clear record. Don’t write only “dangerous tree.” Explain what you saw, what could fail, what could be hit, and what should happen next.

For a basic home screen, use plain working labels:

• Low: No clear defect targets an occupied area. Keep the tree on a routine inspection plan.
• Moderate: A defect or target needs attention, but the situation is not immediately urgent. Schedule care and set a review date.
• High: A likely failure could hit people or valuable property. Restrict access and arrange professional action soon.
• Urgent: A fresh split, new lean, hanging limb, uprooted root plate, or power-line contact creates an immediate safety concern.

These labels are for homeowner decisions. Don’t present them as a formal industry rating unless a qualified assessor performed the assessment under a named method.

Document each tree on its own line or page. Include:

• Tree ID and exact location
• Date and inspection reason
• Species and estimated size
• Observed defects
• Target and expected occupancy
• Weather or site changes
• Photos with matching file names
• Limits of what you could inspect
• Suggested action and review date

Separate observations from reports. “Owner reports storm damage” is different from “freshly broken limb visible over the west fence.” That distinction keeps the record honest.

For property managers, this record can support a maintenance plan before a building is sold or leased. It also gives the next arborist a useful starting point. The report should never pretend that six inspected trees represent every tree on a 40-tree site.

The report should end with a decision rule. For example: “Close the driveway until the cracked limb is inspected,” or “Schedule structural pruning within the next maintenance cycle.” A clear action is more useful than a dramatic label.

By now, you should have a dated record that another person can understand without standing beside the tree.

Step 5: Choose the Safest Next Action or Call a Professional

The final step in a tree risk assessment is choosing what happens next. We usually work through the least disruptive safe option first, but removal is right when the risk cannot be reduced another way.

Match the work to the problem

Pruning can remove deadwood, reduce end weight, and improve branch structure. Structural pruning means cutting selected limbs to improve form, not simply cutting the top off the tree.

Cabling or bracing may support a weak union in selected cases. These systems don’t make a defective tree safe by themselves, and they need correct installation and later checks.

Plant health care may help when insects, disease, drought stress, or poor soil conditions are part of the decline. Injection treatments are targeted chemicals applied through the trunk to address certain pests or diseases. A diagnosis should come before treatment.

Removal may be the safest choice when a tree has severe structural defects, a failing root system, or an unacceptable target. After removal, stump grinding can reduce the remaining stump and make the site easier to use.

We recommend professional help when the tree is tall, close to a building, near utility lines, badly split, newly uprooted, or beyond your safe view from the ground. Don’t use a chainsaw to test a tree. Cutting changes the forces on the tree and can trigger movement.

All Wood’s Tree Service, Inc. provides tree removal, trimming, stump grinding, emergency cleanup, and plant health support for Northern Utah properties. We’re not just a tree service, we’re your long-term property care partner. We provide free estimates, and our team can help you compare pruning, monitoring, treatment, and removal before work begins.

For urgent storm damage, keep people and pets away from the area. Stay clear of downed lines. We provide 24-hour emergency cleanup, but utility hazards must be handled by the proper utility provider before tree work starts.

When comparing local providers, ask who will inspect the tree, what method they use, what the written report includes, and what the response plan is after a storm. Certification can help you judge training, but service breadth also matters. For example, Rivendell Tree Experts lists ISA certification and TRAQ-based assessments in Utah County. TreeMendus Arbor Care lists an ISA Certified Arborist and several emergency services across multiple counties. Darrell’s Tree Service lists hazard assessment, cabling, bracing, health care, removal, and stump grinding across Northern Utah, but its public information does not list an ISA certification.

That difference is worth asking about. A broad service list doesn’t prove assessment skill, and certification alone doesn’t tell you how soon a crew can respond. Ask that question directly before a storm turns a concern into a crisis.

All Wood’s Tree Service, Inc. has been serving Northern Utah since 1995. If your notes show a high or urgent concern, send the tree’s location, photos from a safe distance, and the target it may reach when requesting an estimate.

FAQ

What is a tree risk assessment?

A tree risk assessment is a structured review of a tree’s condition, possible failure, nearby targets, and likely consequences. It looks at both the tree and the site. A homeowner can perform a safe ground check, but a qualified arborist should assess hidden decay, advanced defects, climbing concerns, or trees near power lines.

How often should trees be assessed?

Trees should be checked on a routine schedule and after major storms or other site changes. Active-use properties may need more frequent inspections than quiet residential yards. Inspections should be based on the owner’s risk tolerance, with qualified arborist review preferred for trees that may threaten people or property.

What are the biggest signs of a hazardous tree?

The biggest warning signs include a new lean, soil lifting, a deep trunk crack, a hanging limb, major deadwood over a target, fungal growth near the base, and fresh root damage. These signs don’t prove failure is certain. They do show that a professional tree risk assessment may be needed soon.

Can a tree be saved after a risk assessment?

Yes, many trees can be retained when the risk can be lowered with structural pruning, cabling, bracing, plant health care, or target reduction. The right choice depends on the defect and what the tree could hit. Removal is more appropriate when defects are severe or no safe mitigation plan is available.

When should I call a professional for tree risk?

Call a professional when a tree is near a home, road, play area, power line, or busy driveway. Get urgent help for a fresh split, sudden lean, uprooted roots, or a large hanging limb. All Wood’s Tree Service, Inc. provides free estimates and can help you choose a safe next step.

Conclusion

Start with a ground-level check, but don’t rely on a quick glance when a tree threatens people or property. Record the defect and target, keep the area clear, then contact All Wood’s Tree Service, Inc. for a professional review and free estimate. Serving Northern Utah since 1995, we can help you protect the tree when possible and remove it safely when needed.