A carpenter ant queen is the one ant in the colony that lays eggs. She is the largest ant you will ever see in a carpenter ant colony, roughly 9/16 to 11/16 inch long, with a thick middle section and a big abdomen. After she mates she breaks off her wings, so a queen in a nest has none. Each colony has just one, and she almost never leaves the parent nest.
That last part is why she matters to you. The carpenter ants in your kitchen are workers. The queen is usually somewhere else, in wet wood, laying eggs to replace every worker you kill. Below is what she looks like, how to tell her from a worker, where to look for her, and what happens when you finally kill her.
What Does a Carpenter Ant Queen Look Like?
This is a black carpenter ant queen, the most common one in our area, photographed after she shed her wings.
Here is what to look for if you think you’ve found one:
- Size. She is bigger than any worker. Black carpenter ant queens run about 14 to 18 mm.
- A bulky thorax. The middle section is tall and wide because it held her flight muscles. On a worker it is narrow and smoothly arched.
- Wing stubs or scars. A mated queen chews or snaps off her wings. You can often see small stubs or pale scars on the sides of the thorax where they were attached. If she still has wings, she hasn’t mated yet; our carpenter ant with wings guide covers those.
- A large abdomen. An egg-laying queen’s abdomen can swell so much that the pale skin between the plates shows as stripes.
- Three tiny extra eyes. Queens have three small simple eyes (ocelli) in a triangle on top of the head. Workers usually don’t.
- Color. Same as the workers of her species. More on that below.
Carpenter Ant Queen Size
The best measurements I’ve found come from the Mississippi Entomological Museum, which measured museum specimens of both of our local species:
| Ant | Black | Red |
|---|---|---|
| Queen | 13.9-17.7 mm | 15.0-15.9 mm |
| Large worker | 10.5-12.7 mm | 8.9-13.9 mm |
| Small worker | 5.2-6.8 mm | 5.8-7.1 mm |
In inches, a black carpenter ant queen is about 9/16 to 11/16 inch, and a red carpenter ant queen is about 5/8 inch.
So a queen is not twice the size of every worker, as you’ll read in a lot of places. She is about one and a half times a big worker and more than twice a small one. NC State Extension rounds it to about 9/16 inch. Winged queens look bigger, and Penn State puts winged reproductives at up to 3/4 inch with the wings.
Black vs. Red Carpenter Ant Queens
Queens are colored like their workers. A black carpenter ant queen is black all over, with pale silvery to yellowish hairs lying flat on the abdomen. A red carpenter ant queen (Camponotus chromaiodes) usually has a reddish thorax and legs, often a reddish patch at the front of the abdomen, and dense golden hairs that give the abdomen a golden sheen. Dark red carpenter ants can look almost black. The museum notes the golden hairs are the more reliable clue than the color.
Carpenter Ant Queen vs. Worker
| Queen | Worker | |
|---|---|---|
| Size | 14-18 mm, the largest ant in the colony | 5-13 mm, mixed sizes in one colony |
| Thorax | Tall and bulky, built for flight | Narrow and smoothly arched |
| Wings | Wings before mating; stubs or scars after | Never has wings |
| Abdomen | Large, may look swollen and striped | Smaller in proportion to the body |
| Ocelli (three small eyes on top of the head) | Yes | Usually not |
| Where you see her | Rarely. Swarm season, or a new queen wandering after mating | Trails, kitchens, bathrooms, decks, mostly at night |
| Job | Lays all the eggs | Forages, digs galleries, raises brood |
Most of what you’ll see are worker ants. A big worker with a wide head can pass for a queen at a glance. Look at the thorax. If it is slim and smooth, it’s a worker.
Do Carpenter Ants Have a Queen? How Many?
Yes, and only one. NC State Extension and Penn State Extension both describe a single egg-laying queen per colony, living in the main nest.
You can find more than one queen-shaped ant in a mature nest at certain times of year. Penn State notes colonies don’t make winged males and queens until they are several years old and have about 2,000 to 3,000 workers. NC State says those winged future queens are raised in the fall and wait in the nest until spring to fly. They don’t lay eggs at home. Once they fly, each one tries to start her own colony.
Regional Species Background in the DMV
Here in Virginia, Maryland, and DC, we mostly deal with the black carpenter ant (Camponotus pennsylvanicus). The Mississippi Entomological Museum says mature colonies may hold several thousand workers, and large ones spread across more than one nest site.
The second species we run into is the red carpenter ant (Camponotus chromaiodes), which has a reddish thorax. Both follow the same life cycle, with one queen per colony. We just see the black carpenter ant more often.
What draws a queen to a yard here is wet wood. Wooded lots in Woodbridge, older decks, stumps left after a lot is cleared, and clogged gutters all give a new queen somewhere soft and damp to start. Homes around Lake of the Woods have the same stumps and damp lakeside decks, so if you live out there, our page on ant treatment in Locust Grove is a good next step.
Where the Queen Lives: Parent Nest vs. Satellite Nests
A grown carpenter ant colony lives in more than one place. The queen stays in the parent nest, along with the eggs and the youngest larvae. Eggs dry out easily, so the parent nest has to be in damp wood: a rotting stump, a hollow tree, a woodpile, or wood in the house that stays wet from a leak.
As the colony grows, workers carry older larvae and pupae out to satellite nests. Those can be in drier spots, like wall voids, hollow doors, and foam insulation. University of Minnesota Extension says carpenter ant nests found indoors are often satellites that trace back to a parent colony outdoors. Penn State Extension puts that parent nest within 100 yards of the house.
This is the part most people miss. You can find a nest in a wall, treat it, and still have ants a month later. If that wall was a satellite, the queen was never in it. Workers just move brood to another spot, and she keeps laying eggs.
How to Find the Carpenter Ant Queen
You are really looking for her nest, not her. She almost never comes out. The good news is that the extension services agree on how to track it down, and most of it you can do yourself:
- Put out bait after dark. Carpenter ants forage mostly at night. Rutgers Cooperative Extension suggests a little diluted honey or 25% sugar water near the house or big trees after sunset. Check it an hour or two later.
- Follow the loaded ants home. UMN says ants carrying food are easier to follow. Use a flashlight with red film over the lens, since ants can’t see red light. Penn State suggests looking from May through July, roughly 10 p.m. to 2 a.m.
- Watch where the trail leaves the house. Ants that run outside along a fence rail, a tree limb, or a utility line are heading back toward the parent nest. Ants that go into a wall may be going to a satellite.
- Look for coarse sawdust. Carpenter ants don’t eat wood. They push the shavings out of their galleries, and that pile of frass under a sill or a crack is a good sign the nest is right there.
- Tap and listen. UMN notes an active colony can make a dry rustling sound that gets louder when you tap the wood.
- Check the wet spots. The parent nest needs moisture. Start with:
- Roof leaks and fascia behind overflowing gutters
- Stumps, dead limbs, and firewood near the foundation
- Sill plates where plumbing comes through
- Deck posts and steps in contact with the ground
- Window and door trim that stays damp
Penn State and Rutgers both say workers can travel 100 yards or more from the nest. So if the trail heads off the property line, the queen may be in the neighbor’s stump, and that’s hard to fix from your side of the fence.
In Leesburg that trail usually ends outside the house, in a stump or dead limb on a lot backing up to Goose Creek or Tuscarora Creek, which is why treating carpenter ants in Leesburg means working the yard as much as the wall.
What Our Technician Daren Sees on These Jobs
Daren, one of our registered technicians, has run into the same problem again and again. One carpenter ant house he worked had rotted trim and fascia boards all the way around it. The flashing had been put in wrong in a few spots, so rainwater drained down behind the wood instead of over it. The homeowners kept expecting us to spray the ants away without the wood getting fixed. In Daren’s words: “Until you fix the wood rot or the moisture issue, they’re going to still keep coming. It doesn’t matter how much chemical.”
His view is that the rot is the real problem. “They don’t go and attack wood,” he says. “They only attack wood that’s already rotted out or has a lot of moisture.” Find the wet wood and you’ve usually found where the queen’s nest is, or will be.
What Happens When You Kill the Queen Carpenter Ant?
The colony starts to die, slowly. Carpenter ants have no way to make a new egg-laying queen once she’s gone. The winged future queens in the nest can’t take her place; they have to fly out and mate first.
Workers in a queenless colony may start laying eggs of their own. They never mated, so those eggs can only become males. No new workers get made. The colony shrinks as the workers it already has die off, and the satellite nests go with it, since they are the same colony.
A team led by Annett Endler, with ant biologist Bert Hölldobler, studied this in the Florida carpenter ant (Camponotus floridanus), a close relative of our local species. In their 2004 PNAS study, the queen’s eggs carried a chemical coating on their surface that told workers she was alive. Worker groups given queen-laid eggs did not lay eggs. Groups without them did. Workers also destroyed worker-laid eggs when they could choose between the two kinds. Moving the queen’s surface chemicals onto worker-laid eggs made the workers much less likely to destroy them.
How long the leftover workers hang on depends on the time of year and how big the colony was. Our guide to ant lifespan covers worker lifespans in more detail. For you, the practical answer is that killing the queen ends the colony, but not overnight. You will still see workers for a while.
Two more things to know:
- Killing a new queen you find wandering around doesn’t affect an existing colony. A wingless queen walking across the patio in late spring is usually a freshly mated queen looking for a place to start. Squashing her stops that one future colony. It does nothing to the colony already living in your deck.
- You rarely get to kill her directly. That is why treatment goes through the workers, as covered below.
Carpenter Ant Queen Life Cycle
The queen starts life as a winged ant in her mother’s colony. Penn State Extension says winged males and females leave established colonies on warm days in spring and early summer to mate. The males die soon after. The mated female lands, gets rid of her wings, and goes looking for damp wood. This short window is about the only time homeowners see a queen out in the open. Knowing when ants come out during the year helps you know when to watch for it.
Founding. She chews a small chamber in soft, wet wood, often under bark or in a stump, and seals herself in. Rutgers says she lays 15 to 20 eggs, and they take about two months to become adults. She doesn’t leave to eat. She feeds the first larvae from her own body stores, including the flight muscles she no longer needs.
The first workers. They come out small, because she raised them on her reserves alone. Once they start foraging, she does nothing but lay eggs for the rest of her life.
Growth. Colonies grow slowly. Rutgers says a new colony takes 3 to 6 years to mature. Penn State says it usually has 2,000 to 3,000 workers before it makes winged ants. From then on, NC State and Rutgers say, a mature colony produces 200 to 400 winged swarmers a year. NC State adds that they are raised in the fall and wait in the nest until spring to fly.
Lifespan. NC State and Rutgers both say a queen can live up to 15 years. You’ll see 25 or more years quoted online. I couldn’t find a study on our local species to back that up, so I’m sticking with the extension number.
That slow start is good news if you catch it early. A young colony with a few dozen workers has no satellites yet and is far easier to wipe out than a five-year-old colony spread across a stump, a deck post, and a wall.
Why Spraying Workers Doesn’t Reach the Queen
Most store-bought fixes go after the ants you can see. The trouble is that only a small share of the colony is out foraging at any time. University of Minnesota Extension puts it plainly: spraying foraging workers is not effective, because they carry very little insecticide back to the nest.
Repellent sprays make it worse. The ants detect the treated area and route around it, or the colony splits brood into a new spot. Meanwhile the queen keeps laying eggs and the workers you killed get replaced.
What does work is anything the workers carry home on their own. UMN says baits work because ants share food with the rest of the nest, and it warns that baits can take weeks or months. Non-repellent products work the same way. Workers can’t detect them, walk through them, and spread them to the ants back at the nest. That is the whole idea behind professional carpenter ant extermination: let the workers carry it to the queen instead of chasing them around the kitchen with a spray can.
If you use bait yourself, UMN’s advice is to never spray around it. That kills the very ants you need to carry it home.
How We Go After the Queen
We can’t promise to put eyes on the queen, since she’s usually buried in wood. What we do is work back from the ants you’re seeing to the nest, and treat in a way that reaches her through her workers.
- Inspection. Our technician starts inside, in the kitchens, bathrooms, and basements where you’ve seen ants, looking for trails, entry points, and damp or damaged wood. Then we go outside along the foundation and look for the wet wood the parent nest needs.
- Interior treatment. We put a non-repellent product into the cracks, crevices, and voids where the ants travel and nest, so workers carry it back to the colony.
- Exterior treatment. We treat around the foundation and entry points to reach workers moving between an outdoor parent nest and the house.
- Moisture and wood rot. We point out the rot, leaks, and branches touching the house. As Daren says, if that doesn’t get fixed, the ants keep coming. We don’t repair wood ourselves; a contractor does that part.
- Follow-up. Ant products break down, so our plans include visits three times a year. If ants come back between visits, so do we, at no extra cost.
We’ve dropped 9 of the harshest chemicals common in our industry and use products like Essentria and Alpine instead. Cutting back what carpenter ants eat around the house, like aphid honeydew on shrubs and open sweets, and the tips in our guide to keeping ants away help keep a new queen from moving in after the old colony is gone.
If carpenter ants keep showing up despite your own efforts, the queen is probably somewhere you haven’t reached. Call us at 703-683-2000 or email info@bettertermite.com and we’ll help you find where they’re coming from.
