What Crown Thinning and Crown Raising Actually Mean
These are two different jobs that often get done on the same visit. Both are part of our regular trimming and pruning work, just more specific about where the cuts go.
Crown thinning means taking selected branches out of the inside of the canopy. The outline of the tree stays the same. What changes is how much light and air gets through it. Look up into a thinned maple and you see patches of sky where there used to be a solid green ceiling.
Crown raising means removing the lowest limbs so there's room underneath. Room to mow. Room to park. Room to walk the sidewalk without ducking. Room between the branches and your gutters.
| What to know | Crown thinning | Crown raising |
|---|---|---|
| Where the cuts go | Inside the canopy, spread evenly | The lowest limbs, from the bottom up |
| What changes | More light and air through the tree | More clearance under the tree |
| What stays the same | Height and overall shape | The upper canopy |
| Usual reason | Deep shade, heavy wind load, crowded branches | Limbs over a driveway, roof, walk or lawn |
Signs a Tree Needs Its Canopy Thinned or Lifted
Most people call about one of these.
- Grass won't grow under the tree no matter how much seed goes down.
- Low limbs scrape the roof of the car or slap you off the mower every week.
- Branches rest on the shingles or hang in the gutters.
- The canopy is so dense that the inner branches are dying off for lack of light.
- The tree catches wind like a sail and you watch it out the window every time the sky turns dark.
How We Thin a Tree Crown, Step by Step
Thinning is slow, careful work. Here's how it goes on a big shade tree.
A good thinning job is hard to spot. The tree should look natural, just lighter. If it looks freshly scalped, somebody took too much.
- Walk the tree first. We look at it from every side and agree with you on the goal: more light on the lawn, less weight over the house, or both.
- Climb with ropes. The climber ties in and works from inside the canopy, because that's where the cuts need to be made.
- Deadwood comes out first. Dead, broken and rubbing branches go before any healthy wood is touched.
- Then the selective cuts. Small and medium branches come out evenly across the whole crown, so no one side ends up bare.
- Every cut goes back to a larger branch or to the trunk, just outside the swollen collar where the branch joins. No stubs. No flush cuts.
- Heavier limbs get an undercut first, so the bark doesn't tear down the trunk when the weight lets go.
- Anything above a roof, fence or garden is lowered on a rope and not dropped.
How Crown Raising Is Done Without Hurting the Tree
Raising sounds simple. Cut the low ones off. But which limbs go, and how many, matters a lot.
We start with the clearance you need. A driveway needs enough room for the tallest thing you park there. A sidewalk needs head room. A roof needs a gap, so branches don't rub the shingles or give the squirrels a bridge. Then we take only the limbs that are in the way.
Sometimes the whole limb doesn't have to go. Cutting a drooping limb back to a side branch that points up can give you the clearance and keep the limb. On a big old limb that's often the better call, because a large cut on the trunk takes a long time to close over.
If one low limb is the entire problem, you may only need a single limb taken off and not a full raise.
Best Time of Year for Crown Thinning in Lake County IL
Late fall through winter is the best window for most trees. The leaves are down, so the climber can see the whole branch structure. The tree is dormant, so it isn't pushing new growth while it closes over the cuts.
Oaks are the strict ones. Don't thin or raise an oak from spring through early fall. Fresh cuts attract the beetles that spread oak wilt, and oak wilt kills oaks. On the wooded lots around Long Grove, a lot of the work is lifting oak limbs that have grown out over a driveway, and that work waits for cold weather.
Maples can drip sap from cuts made in late winter. It looks alarming and it's mostly harmless. If you'd like to avoid it, ask us about doing your maple earlier in the dormant season.
Dead, broken or hazardous limbs don't wait for a season. Those can come off any time of year, on any tree.
| Tree | Good time to thin or raise | Why |
|---|---|---|
| Oak | Winter only | Growing-season cuts attract the beetles that spread oak wilt |
| Elm | Winter | Similar disease risk to oaks |
| Maple | Late fall through winter | Dormant, though late-winter cuts may drip sap |
| Most other shade trees | Late fall through winter | Dormant, and the branches are easy to see |
| Any tree with a dead or broken limb | Any time | A hazard shouldn't wait |
What Makes a Thinning or Raising Job Harder
Size is the obvious one. A bigger crown means more climbing and more cuts.
What's underneath matters just as much. A tree in the middle of an open lawn lets us drop small branches straight down. A tree leaning over a roof, a fence, a garage or a patio means every piece gets roped and lowered.
Condition counts too. A tree full of deadwood is brittle, and brittle wood is harder to climb around safely. A tree that was topped years ago grows back as a tangle of weak, crowded sprouts, and sorting those out takes patience.
Wires are a hard line. We don't do work in or touching power lines. If the limbs you want gone are in the lines, that part belongs to ComEd. We can do the rest of the tree.
Access is the last piece. A back yard with a narrow gate means the brush gets dragged out by hand to the chipper. On deep, heavily wooded properties like the ones in Bannockburn, the tree can be a long walk from the street.
What Crown Thinning and Raising Is Priced On
You get one flat price for the job, in writing, before any cutting starts. Quotes are free. We don't publish prices, because no two trees are the same job.
The price comes down to a short list.
There's more on how we figure a job on the tree service pricing page. Got several trees that need work? Send photos of all of them in one text so they can be looked at together.
- The size of the tree.
- Where it stands. Open yard is simpler than over a roof, fence, garage or near wires.
- Its condition. A crown full of dead, brittle wood takes longer to work in.
- Access for getting brush out to the chipper.
- How much of the tree needs work. Lifting a few low limbs is not the same job as thinning the whole crown.
Pruning Mistakes That Ruin a Tree's Crown
A bad pruning job can't be undone.
- Topping. Cutting the top flat to make a tree shorter is bad practice. The tree answers with a burst of weak, fast sprouts, and the big wounds invite rot. We don't do it.
- Stripping the insides. Some crews clean out every inner branch and leave a tuft of leaves at the tip of each limb. It looks thinned. What it really does is move the weight out to the ends, where limbs are most likely to snap.
- Raising too high. Take too many lower limbs and you're left with a tall bare trunk and a small top. The tree gets top-heavy and has fewer leaves to feed itself.
- Taking too much at once. Leaves are how a tree eats. Remove a big share of the live canopy in one go and the tree gets stressed. Heavy work is better spread over more than one season.
- Flush cuts and stubs. Cut too close and you wound the trunk. Leave a stub and it dies back and rots. The right spot is just outside the collar.
- Pruning oaks in summer. It's the most expensive mistake on this list, because it can cost you the whole tree.
Brush Cleanup and Firewood After the Job
When the cutting is done, the crew cleans up. Brush goes through the chipper. Bigger wood gets cut up and hauled away with everything else. Illinois keeps yard waste out of landfills, so the chips and wood are recycled, not dumped.
Want the wood? Say so before we start and it's left cut where you want it. Thinning doesn't make much firewood, since most of what comes out is small. A raise on a big tree can leave a decent pile.
The lawn, driveway and beds get raked before we leave.
Get a Quote for Crown Thinning & Raising in Libertyville
Text a photo of the tree and your town to (224) 944-8652. One shot of the whole tree from a distance and one of the problem spot is plenty. Tell us what's bugging you: the shade, the low limbs, the branches on the roof.
Small jobs are quoted from the photos. You get a written price, you pick a day, and the crew shows up and does the work. We're insured for tree work.
The crew is based in Libertyville and works in every town in Lake County, out to places like Kildeer, where big old oaks shade a lot of the yards.
Many Lake County villages have tree rules, and some require a permit before a tree is removed. Trimming is a different thing, but if the tree sits by the street or you aren't sure it's yours, check with village hall first.
Hours are Monday through Saturday, 7am to 7pm, and Sunday by appointment. If you'd sooner type it out than text, use our contact page.
