What a stump grinder does
A stump grinder uses a heavy wheel fitted with carbide teeth. The operator lowers the spinning wheel onto the stump and sweeps it side to side, taking off a few inches at a time, then moves forward and repeats. The wood comes off as chips mixed with soil.
The goal is to take the stump and the base of the largest roots below the ground. The rest of the root system stays in place and decays. If you need the whole root mass out, that is a different job; see stump removal.
How deep does stump grinding go?
There is no single standard depth. University of Illinois Extension says grinders can take a stump anywhere from flush with the soil line to more than a foot deep. Deeper grinding takes longer and usually costs more, and it leaves a bigger hole to fill.
Match the depth to the plan for the spot:
- Lawn: enough depth to fill with topsoil and seed without hitting wood
- Garden bed or shrubs: more depth, since you will be digging
- New tree in the same spot: usually not recommended right away; see after stump grinding
- Patio, shed, or addition: talk to whoever is building it, since you may need full removal
Whatever you choose, ask for the depth in writing. "Below grade" on a quote can mean very different things.
What access does the machine need?
Stump grinders range from small walk-behind units to large towable machines. In backyards, the compact track and wheel models are common. Vermeer, a major equipment maker, says its compact track and wheel units fit through 36-inch gates. Narrower gates, or a gap beside the house that is tighter than a gate, may limit which machine can be used.
Before you request quotes, walk the route from the street or driveway to the stump and note:
- The narrowest opening, measured in inches
- Steps, retaining walls, or steep slopes
- Soft or wet lawn the machine would cross
- Things close to the stump: a fence, foundation, air conditioner, or buried sprinkler lines
Angi's cost guide lists limited access and difficult terrain as reasons for extra fees, so describing the route up front makes quotes more accurate.
How long does it take?
Angi says a straightforward stump can take about an hour, while dense wood or a complicated trunk can take two to three hours. Several stumps, large surface roots, or a long carry for chips add time. The machine is loud, and chips can be thrown a fair distance, so keep people and pets well back.
What happens to the chips?
Grinding leaves a mound of chips and soil roughly where the stump was. University of Illinois Extension notes that the grindings are usually mixed with soil as the wheel works. It recommends hauling them off if you plan to grow grass there, because wood breaking down in the soil can tie up nitrogen.
You have three common choices: leave the chips in the hole, rake them out and reuse them as mulch, or have them hauled away. Removal is often priced separately, so ask. More on reusing or replacing chips is in after stump grinding.
Call before you dig: UDig NY and 811
Grinding cuts into the soil, sometimes deeply, so buried utilities matter. New York has two one-call centers. UDig NY covers upstate New York, everything north of the New York City metro area, which includes Erie County. New York 811 serves New York City and Long Island.
UDig NY's guidance:
- Dial 811 or submit a request online. The service is free.
- File at least two full working days before work starts.
- If you hire a contractor, state law requires the contractor to submit the request, no more than 10 working days before starting.
- Member utilities do not mark private lines on your property. Lines you or a previous owner installed, such as power to a garage or lamp post, may need a private locator.
- The tolerance zone is the width of the buried line plus two feet on each side of the mark. Within it, lines must be exposed by hand.
Related guides
Grinding visible roots across the lawn is covered in surface root grinding. For what drives the price, see stump grinding cost.
Common questions
How deep does stump grinding go?
It varies with the job and what you ask for. University of Illinois Extension notes grinders can take a stump anywhere from flush with the soil line to more than a foot deep, and that deeper grinding usually costs more. Tell the provider whether you plan lawn, a bed, or a new tree, and get the depth written into the quote.
Will a stump grinder fit through my backyard gate?
Many compact machines are built for it. Vermeer, a major manufacturer, describes its compact track and wheel stump cutters as fitting through 36-inch gates. Equipment varies by provider, so measure your narrowest opening and give that number to every provider you contact.
How long does stump grinding take?
Angi's cost guide says a straightforward stump can be done in about an hour, while dense wood or a complicated trunk can take two to three hours. Setup, multiple stumps, root grinding, and cleanup add time.
Do I have to call 811 before stump grinding in Erie County?
A locate request comes first. UDig NY handles upstate New York, including Erie County. Dial 811 or file online at least two full working days before work. If a contractor does the grinding, state law requires the contractor to submit the request. Private lines, such as a feed to a detached garage, are not marked by member utilities.