Lake Oswego's expert arborists. Serving Clackamas County.

From removals to structural pruning to 2 a.m. storm response, we help Lake Oswego property owners through winter windstorms over saturated soil and the rest of the Willamette Valley risk calendar. Expert arborists, on call around the clock.

Get An Estimate (844) 835-8733

Why Lake Oswego

Why Lake Oswego trees need a real arborist.

The Certified Arborist Tree Service brings expert arborists, consistent standards, and the insurance that matters to your property in Lake Oswego and across Clackamas County, whether it is a single removal or a multiple property storm cleanup.

Across western Oregon the climate is mild, wet, and maritime, with cool wet winters and dry summers, over soil that is deep but often saturated through the wet months and runs acidic. That combination is exactly what pushes tall conifers toward failure and why so many failures start with a tree that looked fine until the ground gave way underneath it.

Knowing which species struggle on that ground, and how winter windstorms, ice, and heavy wet snow load a canopy that is already standing in saturated soil, is the difference between a tree that gets managed on schedule and one that comes down on a roof.

Schedule a site walk in Lake Oswego Call (844) 835-8733

Why Lake Oswego trees fail

The risks we watch in Lake Oswego right now.

When a tree fails on a Lake Oswego property, the cause often traces back to one of these, and an arborist can check for all four on a site visit.

Laminated Root Rot

Spreads through root contact in the region's wet, poorly drained pockets and quietly weakens conifer root systems until a normal winter storm is enough to bring the whole tree down.

Windthrow in Saturated Soil

Tall Douglas fir and other conifers anchor shallower once the ground saturates each winter, so a strong gust can topple a tree that had no visible defect the week before.

Swiss Needle Cast

This foliage disease thins and yellows Douglas fir crowns across the wider region, cutting the tree's vigor and its ability to hold up under storm loading.

Wet Snow and Ice Breakage

Heavy wet snow and ice loads limbs beyond their normal tolerance, and codominant stems or overextended branches are usually the first to fail.

Service area

Our Lake Oswego service area.

Serving Lake Oswego and Clackamas County.

Areas we cover

Click an area to learn more about it.

Free estimate

Tree care in Lake Oswego, one form away.

Tell us what is going on with your trees. An arborist serving Lake Oswego calls you back, walks the property, and puts the price in writing before anything is scheduled.

Prefer to talk? (844) 835-8733

What people are saying

Rated 4.9 stars across 140+ reviews.

Real reviews from real customers, straight from our Google Business Profile. Here's what people say once the crew has packed up and the yard is clean.

★★★★★

March 11th, a brief but strong storm came through Goodlettsville and blew over two giant trees in my front yard; one which was being supported by a 3rd tree that was facing and threatening my house. It was an…

Julie Bangs●3 days ago

★★★★★

From the time I inquired w this company about removing a tree that was strongly impacted from the major strong 80 mph winds on March 3, 2023, they provided us w exceptional service in every way . They were…

Jeanne Mason●3 weeks ago

★★★★★

My family had a tree removal emergency! A large tree in our back yard was on fire and splitting down the middle. The fire department came out the night before to extinguish the fire, but when I woke up the…

Mysty Diehl●6 weeks ago

Read all 140+ reviews on Google

What we do

A geotagged inventory of every tree on the property: species, age, condition, and recommended work, refreshed annually.

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Trees we know

The Lake Oswego species list, and what to watch for.

Local soil, local weather, local pests. Each species here fails in its own way, and we plan around all of them.

Douglas Fir

A tall native conifer common across the region and at risk from laminated root rot and windthrow once winter saturates the soil around its roots.

Red Maple

Handles the region's wet winters well but develops included bark at codominant stems that split under wet snow and ice if never corrected with structural pruning.

Flowering Cherry

A common yard tree across the region that is short lived and prone to canker and decay, so its structure needs a periodic look well before it looks obviously sick.

European Birch

Stressed by the region's warm dry summers and vulnerable to bronze birch borer once it is already weakened, which is why summer watering matters as much as any pruning cut.

Sweetgum

Drops large seed pods and grows a dense crown that catches wind and wet snow, so it needs regular thinning to keep storm loading manageable.

Littleleaf Linden

A tidy street and yard tree in the region, but shallow roots can heave in saturated soil and it benefits from a periodic structural check like anything else on wet ground.

Local expertise

Why an Expert Arborist Matters in Lake Oswego

Western Oregon grows tall, valuable trees on ground that is often saturated each winter. A crew with a chainsaw handles the tree that already fell; an arborist reads the one still standing that will not make it through the next storm, which is the harder and more useful job in wet ground.

Estimates in Lake Oswego are walked by an experienced arborist, not a phone quote. Cuts follow ANSI A300 standards, risk assessments follow TRAQ methodology, and you get a written plan before work begins.

Across Clackamas County

Every community on our Lake Oswego coverage list, from Oregon City to Sandy, has its own page covering the species and storm hazards we plan around there.

Sloped lots, large groups of conifers, windbreak rows, and heavy wet snow and ice each change how a tree fails. One set of standards, applied to whichever risk profile your address actually carries.

Lake Oswego FAQ

Local questions, local answers.

Don't see your question? Call us. Calls are answered by a real person, day or night.

Do I need a permit to remove a tree in Lake Oswego?

Rules vary by lot, tree size, and whether the tree sits in a protected or sensitive area. We confirm what applies to your exact address and handle any permit or arborist report before work begins.

How fast can an arborist get to my property?

Most estimate visits happen within 24 hours, and storm emergencies get a crew on site the same day. We answer the phone around the clock, including during winter windstorms.

What is stressing trees in Lake Oswego right now?

Laminated root rot and windthrow in saturated soil are common causes of conifer failure, with Swiss needle cast weakening Douglas fir crowns and bronze birch borer targeting stressed birch. An on-site look tells us which apply to your trees.

Why do so many trees fail here in winter rather than summer?

Soil across western Oregon is often saturated through the wet season, so tall conifer roots lose their grip right when windstorms and heavy wet snow are loading the canopy hardest. Summer drought stress sets up failures that show up months later.

What standards do your arborists follow?

Our crews are trained to ANSI A300 pruning and removal standards, and risk assessments follow TRAQ methodology. An expert arborist walks the estimate personally, not a sales rep.

Are you insured?

Yes. We carry the insurance that matters.

Take back your trees today