Why oak stumps cost more to grind (and how much more)

Published April 6, 2026 by the StumpCostCalc crew

Solitary mature oak tree in a countryside landscape, the dense hardwood species that triggers grinding surcharges — Photo via Pexels

The fall 2023 derecho that ripped through Indiana, Ohio, and southern Michigan knocked down, by one FEMA estimate, close to two million trees in a single afternoon. In my own zip code the split was probably 60 percent oak, 25 percent maple, the rest scattered across hickory, ash, walnut, and a lot of terrified pines. A year later, I was still watching local tree services grind stumps for a steady line of neighbors. And almost every quote I peeked at had a line item I started to notice: "hardwood surcharge, +15%."

Is the surcharge real? Yes. Is 15 percent a fair number? Also yes, usually. Here is why.

Janka hardness is a real thing

The wood industry uses a measurement called Janka hardness, which is the force (measured in pounds-force) required to press an 11.28mm steel ball halfway into the end grain of the wood species. The number is a reasonable proxy for how hard the wood is to cut, drill, or grind.

Balsa: 70 lbf (toy wood)
Eastern white pine: 380 lbf
Cedar: 350 to 580 lbf
Yellow poplar: 540 lbf
Silver maple: 700 lbf
Birch: 910 to 1,260 lbf
Black walnut: 1,010 lbf
Red oak: 1,290 lbf
Sugar maple: 1,450 lbf
White oak: 1,360 lbf
Hickory: 1,820 lbf
Black locust: 1,700 lbf
Osage orange (a.k.a. hedge): 2,620 lbf

A Stihl MS 271 chainsaw that chews through a 14-inch pine log in 30 seconds takes 3 to 4 minutes on a comparable oak cross-section. A stump grinder's carbide teeth show the same differential. In practice, grinding oak takes 30 to 50 percent longer than grinding the same-sized pine. The crew charges you for that extra time.

Tooth wear is a real cost

The carbide-tipped teeth on a stump grinder cost $35 to $60 each. A Vermeer SC30TX carries about 22 teeth on its cutter wheel. At full retail, a complete re-teeth costs $1,100 to $1,300. An operator grinding daily on softwood can go 4 to 6 months between re-teeths. On hardwood, 6 to 10 weeks. On osage orange or black locust in rock-riddled soil, 2 to 3 weeks.

That cost has to go somewhere. It goes into the hardwood multiplier.

The 15 percent multiplier is not made up

I pulled the multipliers published by the eight cost-reference sites StumpCostCalc uses. Every one of them identifies a hardwood premium:

LawnLove: +$50 to $150 on a typical job
Angi: "20 to 30 percent higher for hardwood"
Fixr: "expect $4 to $5 per inch for oak vs $2.50 to $3 for pine"
BobVila: "premium species add 10 to 20 percent"
HomeGuide: a species chart showing roughly 1.15x to 1.25x for oak and hickory over pine and cedar

The calculator uses 1.15x (15 percent) as the hardwood multiplier, which is the conservative middle of the range. In markets where the crews disclose the surcharge transparently, 20 percent is more common. Crews that roll the hardwood cost into their base per-inch rate for everybody are just charging more up front and claiming no surcharge.

Which species get flagged as hardwood

For grinding purposes, the practical split is:

Softwood (no surcharge): pine, spruce, fir, cedar, redwood, hemlock, cottonwood, poplar, willow, birch. Any of these at 18 inches diameter should quote right at the per-inch midpoint with no species bump.

Hardwood (10 to 20 percent surcharge): red oak, white oak, pin oak, sugar maple, silver maple, Norway maple, hickory, walnut (black and English), locust (honey and black), elm, ash, pecan, beech, sycamore, tulip tree (technically softwood but dense enough to grind like hardwood).

Exotic or edge cases (20 to 40 percent surcharge, request on quote): osage orange, black locust, ironwood (eastern hophornbeam), mesquite, live oak, eucalyptus (especially drought-cured in California and Texas).

If you do not know what species is in your yard, take a photo of the bark (if any still clings to the stump), a photo of a leaf if there is a sucker growing from the base, and ask the arborist during the quote visit. Most can ID a stump by the bark pattern in 5 seconds.

The December 2022 pecan story

A client in north Texas asked me to review three quotes she had gotten for grinding out a pecan stump left from the December 2022 freeze that killed hundreds of thousands of pecan trees across the state. Pecan is a hardwood, Janka roughly 1,820 lbf, and the specific tree was drought-cured for two years before the freeze finished it. By the time she called for grinding, the stump had the density of a fence post set in concrete.

Quote one: $250 flat rate, a neighbor-of-a-neighbor with a rental machine. Declined by the crew after the walk-through.

Quote two: $450, a local crew with a Vermeer SC30TX. Included the 20 percent hardwood surcharge, factored the drought-curing.

Quote three: $650, a metro Dallas chain. No surcharge line item, just a higher base rate.

She hired quote two. Crew was onsite 55 minutes for what was nominally a 22-inch stump that should have been a 30-minute job. Operator snapped 2 teeth during the grind. The surcharge was honest.

How to use this

When you measure your stump, also note the species. If it is softwood, do not let a crew add a hardwood premium without looking at the wood. If it is hardwood, expect the 10 to 20 percent bump and do not argue it, it covers a real cost. Run the numbers in the calculator with the correct wood type so your expected range matches what the crew is working from.

A Texas live oak note

Live oak deserves its own paragraph because it is the Janka-heaviest tree most homeowners in Texas, Louisiana, and coastal Georgia will ever hire out. Live oak clocks in at roughly 2,680 lbf on the Janka scale, which is denser than hickory and black locust, both of which are themselves hardwood surcharge species. A 24-inch live oak stump behaves more like a 30-inch red oak for grinding purposes. Crews in the Gulf Coast markets know this and typically apply a 25 percent hardwood premium on live oak specifically, not the 15 percent they would use on red oak or maple.

If you are in Houston, Austin, San Antonio, or New Orleans and you have a live oak stump to grind, do not be surprised by a quote that looks 25 to 35 percent above the national average for a similar-diameter stump. The wood justifies it. If a crew does not mention live oak as an up-charge and just quotes you the red-oak rate, they are probably going to run into the hardness midway through the grind and either raise the price at completion or do a shallow job. Ask on the phone: "is there a live oak premium?" A good crew will say yes, here is the number. A lowballer will say no, because they have not learned to ask the species.

The bottom line on species

Ten to twenty percent on real hardwood is honest. Twenty to thirty percent on live oak, hickory, osage orange, or locust is honest. More than that needs a specific story (drought-curing, visible metal in the stump, old roots with rocks) that the operator can explain.

One last thing. If the crew quotes hardwood premium on every stump regardless of species, or they cannot name the species when you ask, that is a sign of a less-experienced outfit. Good operators know their wood.