Boston's ant season starts the moment the ground thaws. Walk down a sidewalk in Jamaica Plain or the South End in May and you will see small mounds in the cracks between bricks. Those are usually pavement ants, and they are just the beginning. The mix of old wood, damp basements and mature trees in neighborhoods like Roslindale, West Roxbury and Brookline-adjacent streets also supports carpenter ants, which can do real structural damage.
PestMinistry is a referral service. We connect you with independent, licensed ant control providers in our network and do not treat properties ourselves.
Know which ant you have
- Carpenter ants are large, black or black-and-red, and nest in damp or damaged wood. You may find piles of coarse sawdust-like frass beneath a wall or window.
- Pavement ants are small and dark brown with parallel lines on the head. They nest under slabs, stoops and sidewalks and march into kitchens in lines.
- Odorous house ants are brown and give off a rotten-coconut smell when crushed. They love sweets and can have several queens in a single colony.
Identification matters because the treatment differs. Carpenter ants need the nest found and removed, while sugar-feeding ants respond to baits.
Why carpenter ants matter in older Boston homes
Carpenter ants do not eat wood; they excavate it to make galleries. They favor wood softened by moisture, such as window frames with failed caulk, a leaking bay window, a roof flashing leak or a wet porch ledger. Triple-deckers with back porches that have seen decades of weather are a classic setting. Winged ants in early spring inside your home, or a steady trickle of big black ants at night, can mean a nest in a wall void.
Treatment approach
- Inspection of window sills, attic eaves, tree limbs touching the roof and the foundation perimeter.
- Locating trails, since following workers back to the nest is the surest way to find it.
- Applying baits for sweet-seeking species, along with targeted treatment of nests and entry points.
- Advising you on moisture repair so the damp wood does not draw them back.
Spraying visible ants on the counter usually just scatters the colony. Providers prefer to let workers carry bait home.
What you can do now
- Wipe up syrup, crumbs and pet food right away.
- Trim tree branches that touch the roof or siding.
- Repair leaky roof flashing and gutters.
- Seal cracks near utility lines.
- Store firewood off the ground and away from the house.
Seasonal timing
Ants follow a predictable calendar in eastern Massachusetts. Winged carpenter ants may appear indoors in late winter if a nest has been warming inside a heated wall. Pavement ant swarms often show up on warm spring afternoons. Odorous house ants become the main kitchen nuisance in late summer when outdoor food sources dry up. Knowing this rhythm helps you decide when to inspect your own home: check window frames and the basement sill in March, and look at your gutters and porch wood before the summer storms arrive.
Reach a provider
If ants keep returning, call (844) 725-1661. We will connect you with a licensed provider in our network in the Boston area.
Ant questions in Boston
Why do ants appear after heavy rain?
Flooded nests send colonies searching for dry shelter, which is often your kitchen or bathroom.
Are flying ants in April termites?
Possibly either one. Ants have a pinched waist and bent antennae, while termites have a straight body and straight antennae. If unsure, keep a sample for the provider.
Do ants in the yard need treatment?
Not always. Outdoor ants only need attention when they are heading into the house or damaging a structure.
Can ants damage my wiring?
Some species are attracted to electrical equipment, but carpenter ant tunneling in wet framing is the more common concern in Boston.