JB
★★★★★
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
Denver's expert arborists. High desert sun, alkaline clay, hard winds.
Denver trees grow on alkaline clay under intense sun and cold winters, then take the brunt of canyon winds sweeping off the foothills. We remove, prune, and treat for that exact combination, with an arborist on call around the clock for storm damage.
99% recommended
Why Denver
Why Denver trees need a real arborist.
The Certified Arborist Tree Service sends an expert arborist to every Denver job, not a crew that just runs a chainsaw. Removals, structural pruning, and storm cleanup all get the same insured, credentialed read before a cut is made.
Denver sits in a semi-arid high desert climate with intense sun and cold winters, on alkaline clay that locks up iron before a tree's roots can use it. That soil chemistry alone explains a lot of the yellowing and dieback we get called out for.
Add downslope canyon winds funneling off the foothills, heavy wet spring snow that loads a canopy fast, and the occasional late frost, and you get a short list of ways Denver trees actually fail. We plan every job around that list, not a generic one.
Why Denver trees fail
The risks we watch in Denver right now.
When a tree fails here, the cause is usually one of a few problems we check on every Denver site visit.
Mountain Pine Beetle
Ponderosa pines under drought stress lose their ability to pitch out attacking beetles. We look for boring dust and fading crowns before a stand goes from yellow to dead.
Iron Chlorosis
Denver's alkaline clay locks up iron so maples and lindens cannot pull enough of it from the soil, leaving leaves pale and veins dark green. Left alone, it weakens the whole tree.
Emerald Ash Borer
Green ash across the metro is at risk once this borer establishes locally. We inspect canopy thinning and bark splitting and treat or plan removal before a hazard tree forms.
Spruce Ips Beetle
Colorado blue spruce stressed by heat or drought draws these bark beetles, and cytospora canker often follows. Fading upper branches on a spruce is the first sign we check for.
Service area
Our Denver service area.
Serving Denver County and the surrounding Front Range communities.
Areas we cover
Click an area to learn more about our work there.
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.
JM
★★★★★
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
GH
★★★★★
CATS crew was amazing across the board from Mike & Lisa & Joe to the crew that came to our house. The consultation was easy and informative and made me feel comfortable in choosing them. The price was less…
Guy Hunt●1 month ago
What we do
Tree care across Denver, made easy.
Tree Services
Tree Removal
Whether a tree is damaged, dead, or a safety hazard, our crews ensure safe and efficient removal with minimal disruption to your property.
Learn more →Tree Services
Tree Trimming & Pruning
Keep your trees safe, structured, and looking right. We remove dead or overgrown branches, improve clearance, and reduce storm risk.
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Emergency & Storm Damage
When storms cause tree damage, our emergency team responds quickly to remove hazards, clear debris, and restore safety.
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WindReady™ Storm Prep
Strategic pruning, cabling, and bracing to reduce storm damage risks before severe weather hits.
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Safety & Risk Assessments
Identifying potential hazards before they become problems. Tree stability, structural integrity, and surrounding risks evaluated on-site.
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Virtual Consulting & Estimates
Get expert arborist guidance without a site visit. Share photos or video of your trees and receive a written assessment and estimate within 24 hours.
Learn more →Commercial
Multi-Location Management
Simplify tree care across multiple properties with a single, trusted provider. Consistent maintenance and emergency response.
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HOA & Property Management
One point of contact for the whole community: scheduled rounds, board-friendly reports, and uniform standards across every lot.
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Municipal Tree Care
ROW maintenance, public works contracts, and storm response for city forestry teams. We handle permits and traffic plans.
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Fortune-500 Grounds
Corporate campuses, hospital systems, and headquarters landscapes. Quarterly walks, annual risk reports, COIs on file.
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Commercial Emergency Response
Under 2-hour dispatch to any property in our service area. Liability coverage and safety plans on file with your operations team.
Learn more →Commercial
Property Tree Inventory
A geotagged inventory of every tree on the property: species, age, condition, and recommended work, refreshed annually.
Learn more →Trees we know
The Denver species list, and what we watch for.
Local soil, local weather, local pests. Each species here fails in its own way, and we plan around all of them.
Honeylocust
A common Denver street tree that tolerates the alkaline soil well, though heavy wet spring snow can still snap poorly structured limbs.
Green Ash
Handsome in older Denver neighborhoods but increasingly at risk from emerald ash borer, which is why we watch canopy density closely on mature specimens.
Norway Maple
One of the first trees to show iron chlorosis on Denver's alkaline clay, with pale leaves and dark veins signaling roots that cannot access enough iron.
Colorado Blue Spruce
A regional favorite that struggles when drought stressed, drawing spruce ips beetle and cytospora canker, and its dense form catches canyon winds hard.
Littleleaf Linden
Prone to the same iron chlorosis as maples in Denver's high pH soil, and its shallow roots make it sensitive to the wide daily temperature swings here.
Ponderosa Pine
A native pulled from the foothills into Denver landscapes, where drought stress leaves it exposed to mountain pine beetle.
Local expertise
Why an Expert Arborist Matters in Denver
Denver's high desert climate and alkaline clay make demanding trees out of otherwise ordinary species. A crew with a chainsaw treats the tree that already failed; an arborist reads the one about to, whether that is a spruce carrying beetle stress or a maple starving for iron.
Every estimate is walked by an experienced arborist. Cuts follow ANSI A300, risk assessments are TRAQ qualified, and you get a plan and a current Certificate of Insurance before work begins.
Across Denver
Denver County covers a wide mix of mature street trees, foothill adjacent yards, and newer plantings, all sitting on the same alkaline clay and exposed to the same canyon wind events off the Front Range.
Every community in our coverage list has its own page covering the species, soil, and storm exposure we plan around there.
Denver FAQ
Local questions, local answers.
Don't see your question? Call us. Every call is answered by a human arborist, day or night.
Do I need a permit to remove a tree in Denver?
Local rules vary by jurisdiction, lot, and whether the tree is protected. We confirm the requirements for your exact Denver address and handle any permit or arborist report needed 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.
What is stressing trees here right now?
The biggest regional factors are mountain pine beetle, iron chlorosis from the alkaline clay, emerald ash borer, and spruce ips beetle on stressed conifers.
What standards do your arborists follow?
Every job runs to ANSI A300 standards and risk assessments are TRAQ qualified. An expert arborist conducts every estimate.
Are you insured?
Yes. We carry full general liability and workers' compensation on every crew and can email a current Certificate of Insurance before work begins.
Why do my maple and linden leaves look pale with dark veins?
That is iron chlorosis, common in Denver because the alkaline clay soil locks up iron before roots can absorb it. We treat the soil chemistry directly rather than just the leaves.
Take back your trees today
One expert arborist. Every tree on your property.
Free estimate. Twenty-four-hour response. No contracts. No commitments.
Or call (844) 835-8733, answered 24/7 by a human.
