Key takeaways
- Florida carpenter ants do not excavate sound wood; they nest in existing voids and in wood softened by moisture or decay (UF/IFAS).
- Branches, shrubs and wires touching the house are their main bridges, so trimming is one of the most useful prevention steps.
- They forage mostly at night, from just before sunset to about two hours after, so many homeowners never see the trail.
- Winged carpenter ants swarm in the rainy season, May through November, and are often mistaken for termites.
- Fix leaks around windows, roofs, tubs and dishwashers: damp wall voids are favorite nest sites.
In this article
The best way to prevent a carpenter ant infestation is to take away what the ants are looking for: damp, hidden voids to nest in, branches and wires that lead onto your roof, and easy food and water inside. Fix leaks, trim the plants that touch your house, seal the gaps around pipes, wires and windows, and keep sweets and protein foods sealed.
In South Florida, the carpenter ant most homeowners deal with is the Florida carpenter ant, often called the “bull ant.” It behaves quite differently from the wood-tunneling carpenter ants of the northern states, and that changes what prevention looks like. This guide explains how these ants get in, the conditions that invite them, and a room-by-room checklist to keep them out.
Which Carpenter Ants Live in South Florida?
Three carpenter ants matter most in Miami-Dade, Broward, Palm Beach and the Keys.
- Florida carpenter ant (Camponotus floridanus). Workers are 5.5 to 11 mm long, with an ash-brown to rusty-orange head and thorax, a black abdomen and long golden hairs. According to UF/IFAS, Florida carpenter ants accounted for about 20% of homeowner ant complaints in a survey of four metro areas.
- Tortugas carpenter ant (C. tortuganus). A thinner, paler relative limited to central and southern Florida. In South Florida, Florida carpenter ants outnumber it about two to one.
- Compact carpenter ant (C. planatus). A smaller, more compact relative of the Florida carpenter ant. UF/IFAS notes it is the subject of numerous calls to pest control companies in South Florida and is increasingly recognized as a structural pest in Florida.
The black carpenter ant (C. pennsylvanicus), the large species familiar from the northern states, is found in Florida’s Panhandle, according to UF/IFAS. It is not the carpenter ant in your Miami kitchen. For help with other species, see our guide to ants in South Florida.
Why Florida Carpenter Ants Move Into Homes
They Need Voids, Not Sound Wood
Florida carpenter ants do not excavate sound wood. UF/IFAS explains that they hollow out wood that is already soft from moisture or fungi, as well as rotten or pithy wood and Styrofoam. Most of the time they simply move into spaces that already exist. That makes moisture control and sealing the heart of prevention. Our article on carpenter ant lifecycle, habitat and habits explains how colonies grow and spread.
UF/IFAS lists these indoor nest sites:
- Wall voids, especially those with moisture seepage
- Under attic insulation, often near the eaves
- Under bathtubs and bathroom fixtures, and under appliances, especially dishwashers
- Around windows, door frames and skylights with moisture intrusion, and in flat roofs
- Electrical, fuse, meter and timer boxes, a reason they sometimes show up in electrical outlets
- Hollow supports of patio screens and patio ceilings
- Boxes, paper bags and closets that are rarely used
They Travel on Bridges
Florida carpenter ants forage in trees and shrubs, and UF/IFAS recommends removing tree and shrub branches that touch the house and treating wires that serve as ant bridges. A single oak limb resting on the roof can deliver a steady stream of foragers to your attic vents and soffits.
They Follow Food and Water at Night
Florida carpenter ants eat sweets, floral nectar and honeydew from aphids, scales and mealybugs, along with living and dead insects. Indoors they seek out moisture from leaks in kitchens and bathrooms. They forage mainly at night, with peaks from just before sunset until about two hours after, and again around dawn. Many families only notice them when they turn on the kitchen light at 10 p.m.
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When Carpenter Ants Swarm in South Florida
Winged males and queens leave mature colonies to start new ones. UF/IFAS reports that Florida carpenter ants fly mainly in the evening or at night during the rainy season, and that complaints peak during the spring swarm.
active peak
Source: UF/IFAS EDIS (IN455)
Swarmers are often mistaken for termites, and the treatment for each is completely different. Winged ants have a pinched waist and elbowed antennae; our comparison of termites vs. flying ants shows the differences side by side.
Carpenter Ant Prevention Checklist
Use this table for a walk-around inspection at the start of the rainy season and after any big storm.
| Area | What to check | What to do |
|---|---|---|
| Trees and shrubs | Branches touching the roof, walls or screen enclosure | Trim so nothing touches the house |
| Wires and cables | Utility and cable lines running from trees or poles to the house | Have a professional treat or reroute ant bridges |
| Roof, eaves and skylights | Leaks, soft fascia, gaps at soffits | Repair leaks and replace water-damaged wood |
| Windows and doors | Moisture around frames, worn weather stripping | Caulk exterior gaps and replace weather stripping |
| Bathrooms and kitchen | Leaks under tubs, sinks and dishwashers | Fix drips and dry wet cabinets |
| Patio and pool enclosure | Hollow screen supports and patio ceilings | Seal openings and watch for evening trails |
| Yard | Firewood, lumber and debris against the house | Store away from the home and off the ground |
| Pantry and garage | Open sweets, pet food, cardboard boxes | Use hard, sealed containers |
Fix Moisture First
Because damp wood and wet wall voids are what carpenter ants want, every leak you fix removes a potential nest. Repair roof and window leaks, keep gutters clear and replace moisture-damaged wood, as the National Pesticide Information Center recommends. Check the AC condensate line and the area under the dishwasher too.
Cut the Bridges
Trim tree and shrub branches so they do not touch the walls or roof, and trim overhanging limbs. UF/IFAS also suggests sticky pest barriers on tree trunks, which keep ants from climbing into foliage. UC IPM advises checking those bands every one to two weeks so debris does not form a bridge across them.
Seal the Way In
Caulk exterior openings and add weather stripping to doors and windows. Pay special attention to the points where pipes, wires and cables enter the house, since ants travel along them.
Take Away Food and Honeydew
Store sugar, honey, syrups and pet food in hard, sealed containers, and clean up crumbs and spills, especially sweet drinks. Outside, ants protect aphids, scales, mealybugs and whiteflies for their honeydew, according to UC IPM. Controlling those plant pests, for example with Toro’s whitefly control on ficus hedges and ornamentals, takes away a major food source. For kitchen habits that keep every kind of ant out, see our home ant prevention methods.
What Not to Do
- Do not spray every ant you see. UF/IFAS warns that over-treating around a nest can make the ants relocate, which spreads the problem into new voids.
- Do not count on sugar baits alone. Carpenter ants are picky feeders and recruit poorly, which reduces bait effectiveness, and UF/IFAS notes they generally accept protein baits better than sugar baits.
- Do not ignore a single colony. One nest in a damp wall can point to a leak that needs repair anyway.
How a Professional Stops Carpenter Ants
If you see large ants indoors at night, winged ants inside or ants coming from outlets, window frames or the attic, call a professional. Finding a carpenter ant nest usually means following foragers at night and treating the nest directly with a small amount of the right product, which is hard to do safely inside walls.
Toro’s technicians inspect inside and outside your home, follow the trails to the nests, whether in a wall void, a palm or the attic, and confirm the species before treatment. Nests, trails and entry points are treated with products chosen for carpenter ants and applied according to their label directions. You also get practical recommendations, such as trimming branches and fixing moisture problems, and follow-up visits to make sure the ants are gone.
Toro has protected South Florida homes since 1969, and if the bugs come back, so will Toro, at no additional cost to you. For more steps, see carpenter ant-proof your home: essential steps and why prevention still matters in our mild winter months.
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305-594-4767Frequently Asked Questions
What attracts carpenter ants to a house?
Do carpenter ants in Florida eat wood like termites?
Do carpenter ants bite?
Is it carpenter ants or termites if I see wings in my house?
How do I know if I already have carpenter ants?
Sources
- Florida Carpenter Ant, Bull Ant, Tortugas Carpenter Ant (EDIS IN455), UF/IFAS Extension
- Compact Carpenter Ant, Camponotus planatus (EDIS IN346), UF/IFAS Extension
- Ant Control in the Apiary (EDIS IN1181), UF/IFAS Extension
- Ants, National Pesticide Information Center
- Ants: Pest Notes, University of California Statewide IPM Program
Educational content. This article is for general information about pests in South Florida and is not medical, legal or professional advice. If you have a bite, sting or allergic reaction, contact your doctor; in an emergency, call 911. Pest problems vary from home to home, so a licensed professional should inspect before treatment. When using any pesticide, always read and follow the product label.
