Parker, CO · Tree Removal, Pruning & Ash Injections
Trunk injections, removal, pruning and stump grinding across Parker. In July 2026 a certified arborist chiselled back the bark on an ailing ash in a Parker front yard and found the tunnelling — the first emerald ash borer ever recorded in Douglas County.
Trunk injection works on a healthy ash and does very little for one that is already collapsing. The assessment that tells you which you have is free.
Free on-site assessment · Written quote · No obligation
It was not a trap and it was not a survey. A homeowner had an ash that looked wrong. Jacob Griffiths, a certified arborist, went out, chiselled back the bark and found the winding galleries underneath and an adult beetle in a D-shaped exit hole. Colorado State University entomologists confirmed it.
Parker Town Forester Erik Stadsvold had suspected it for a while and had the traps up: “We put up some traps here about a month ago to try to collect an actual bug because even though we thought it was here, we needed an actual specimen for them to confirm.”
That is the detail worth sitting with. The confirmation did not come from the Town’s monitoring programme. It came from one homeowner who thought a tree looked off and called somebody qualified to look at it. Every detection in this state started that way.
Yes. Emerald ash borer was found in a Parker front yard in July 2026 by a certified arborist and confirmed by Colorado State University entomologists in August 2026. It was the first confirmed detection in Douglas County. Parker Town Forester Erik Stadsvold has said trunk injection is the effective response: that it “has been basically proven effective over the years.”
Four steps, in order. None of them requires you to spend money with us, and the first two are free.
Compound leaves with five to nine leaflets, opposite branching, diamond-pattern furrowed bark on a mature trunk. Plenty of people pay for an ash treatment on a tree that is not an ash. If you are not sure, send a photo or have someone look.
Emerald ash borer kills from the top down. Thinning that starts in the upper third, D-shaped exit holes about an eighth of an inch across, vertical bark splits with S-shaped tunnels beneath, shoots erupting from the trunk, and heavy woodpecker work are the signs.
A healthy ash responds well to trunk injection, which protects it for roughly two years per treatment. An ash that has already lost a large share of its canopy generally does not come back, and money spent treating it is money that could have gone toward the removal you will need anyway.
Treatment is a repeating commitment, not a one-off purchase. We will tell you what the next decade costs before you start, so you can decide whether this particular tree is worth it to you. Some are. Some are not.
Nearly every complaint people have about tree companies comes down to the same thing: something happened that the homeowner never agreed to. These five exist so that cannot happen here.
Parker’s median build year is 2004, but that average hides the two ends of the town, which need almost opposite work.
Lots from a quarter acre to half an acre and beyond, with mature ponderosa pine throughout. Fifty-year-old conifers on big lots is a hazard-and-clearance conversation: deadwood over the roofline, limb failure in heavy wet snow, and the slow decline that drought puts on pines. Stadsvold’s line about stressed trees applies here more than anywhere — “stressed trees are even more susceptible, more attractive.”
Ten-year-old trees on modern suburban lots. Nothing here is a hazard yet, and that is exactly the point. This is the decade when structural pruning is cheap and decisive: one cut now removes the codominant stem that would otherwise split the tree in half in 2045. Almost nobody prunes at this stage, which is why so much of the 1990s-built metro now needs cabling.
Erik Stadsvold said the quiet part out loud when the Parker find was confirmed: “One thing we do know is that stressed trees are even more susceptible, more attractive.”
A well-watered ash mounts a real defence. It pushes back against boring insects, it compartmentalises damage, it holds canopy. A drought-stressed ash does none of that well, and the chemical signals a struggling tree gives off are part of what draws the beetle in the first place.
So the two problems in front of Douglas County right now are not separate problems. Water discipline is part of your pest strategy, and a tree that is going to be treated should be watered properly first. We will tell you what that looks like for your specific trees at the assessment, and it costs nothing.
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“John and his crew, Richard and Jeff, removed the storm damaged branches from the maple tree and chopped the roots out of our yard. As always, John and his crew were punctual and really did a great job.”
— Martha P. · Verified Google Review
★★★★★
“They did a great job for us on pruning and removal of fallen branches after a storm. Derek, Jonathan and whole crew were a pleasure to work with. Came out quickly for the quote and got the work done less than a week later.”
— Louis B. · Verified Google Review
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“Bid for work was promptly prepared and presented. Fair price. Crew arrived on date and time quoted. All cut materials removed, and job site cleanup satisfactory.”
— Bruce C. · Verified Google Review
Yes. It was found in a Parker front yard in July 2026 and confirmed by CSU entomologists in August 2026 — the first confirmed detection in Douglas County. It was found by a certified arborist who chiselled back bark on an ailing tree and located the tunnelling and an adult beetle in a D-shaped exit hole. Town Forester Erik Stadsvold had traps out at the time and had suspected the pest was already present.
It depends almost entirely on how much canopy the tree has already lost. Our treatment page puts the responsive threshold at under 40% decline and CSU guidance is more conservative at about 30%. A healthy ash responds well to trunk injection and holds for roughly two years per treatment. A tree well past that point is usually a removal, and treating it is money you will spend twice.
Parker’s Town Forester says it does. Erik Stadsvold on injection: “That’s the one thing that is effective. That’s been basically proven effective over the years.” It is delivered into the tree rather than sprayed across your yard, which matters if you have children, pets, pollinators or a vegetable bed. It is also a repeating commitment rather than a one-off purchase, and we will show you the multi-year cost before you decide.
Yes, substantially. The Pinery’s mature ponderosa on quarter-acre-plus lots is a different job from Parker’s newer subdivisions. Fifty-year-old conifers bring deadwood over rooflines, wet-snow limb failure and drought decline. Newer neighbourhoods like Idyllwilde have ten-year-old trees where the valuable work is structural pruning that prevents problems rather than hazard reduction that responds to them.
No. Town forestry covers town-owned trees and open space, not private yards. We were not able to reach the Town’s own pages to verify the exact scope, so check with Parker directly if your tree may be in a right-of-way. If it is in your yard, it is yours, and the assessment is on us.
Check directly with Parker Water and Sanitation District — we were not able to verify the current rules from an official source, and we are not going to print numbers we cannot stand behind. What holds across every district in this metro is the principle: turf restrictions are tight, and trees are almost always exempt when watered by hand or by drip. Confirm your own district’s wording before you turn anything off for the winter.
One ISA Certified Arborist behind all six, and one written quote if you need more than one of them.
Tree Removal · Tree Trimming & Pruning · Stump Grinding · Pest & Disease Control · Tree Injections · Lawn Fertilization & Weed Control
Aurora · Denver · Centennial · Castle Rock · Highlands Ranch · Englewood · Littleton · Greenwood Village
An ISA Certified Arborist will identify your trees, check the canopy properly and tell you whether treatment is worth it. Free, written, and no obligation either way.
312 Norfolk St, Unit A, Aurora, CO 80011 · Monday to Friday, 8:00 AM to 5:00 PM · Serving Parker and the Denver metro since 2003