Danger Level: 4/5

Carpenter Ants

Camponotus species

Carpenter ants are among the largest ants in North America, measuring 6-13mm. Most are solid black, though some species have reddish-brown thoraxes. They have a single node between thorax and abdomen ...

Quick Facts

Size6-13mm long (largest common ant)
ColorBlack, sometimes with reddish-brown thorax
LifespanWorkers: 7 years, Queens: 25+ years
Active SeasonsSpring, Summer, Fall
Common LocationsWood structures, Trees, Decks

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Identification

How to Identify Carpenter Ants

Quick Answer

Carpenter ants are among the largest ants in North America, measuring 6-13mm. Most are solid black, though some species have reddish-brown thoraxes.

Carpenter ants are among the largest ants in North America, measuring 6-13mm. Most are solid black, though some species have reddish-brown thoraxes. They have a single node between thorax and abdomen and evenly rounded thorax profile. Unlike termites, they have bent antennae and a narrow "waist."

Carpenter Ants - showing key features for identification
Behavior

Carpenter Ants Behavior & Habits

Understanding how carpenter ants behave helps prevent infestations

Carpenter Ants behavior and habitat

Carpenter ants excavate galleries in wood to create nests—they don't eat wood but remove it to expand their colony. They prefer moist, decaying wood but will move into sound wood. Parent colonies are often in trees, stumps, or landscape timbers, with satellite colonies in structures. They're primarily nocturnal.

Dangers

Carpenter Ants Risks & Dangers

What carpenter ants can do to your health and property

Health Risks

Carpenter ants can bite when disturbed but rarely do. They don't carry diseases but their presence often indicates moisture problems that could lead to mold issues.

Property Damage

Carpenter ants cause significant structural damage by hollowing out wood for nesting. Unlike termites, the damage progresses slowly over years, but untreated infestations can compromise structural integrity. Repair costs typically range from $1,000-$10,000+ depending on extent.

Warning Signs

Signs of Carpenter Ants Infestation

Look for these indicators in your home

Large black ants inside home, especially at night
Sawdust-like debris (frass) near wooden structures
Faint rustling sounds inside walls
Winged ants emerging indoors (spring swarmers)
Damaged wood with smooth, sandpapered galleries
Ants trailing from trees or stumps toward house

Carpenter Ants in Boise & the Treasure Valley

Carpenter ants are common in wooded areas around Boise, Eagle, and the foothills. They're particularly problematic in older homes and properties near mature trees. Idaho's dry climate means they strongly seek out any moisture sources in structures.

Our Solution

How We Eliminate Carpenter Ants

Professional treatment for complete elimination

Carpenter ant control requires locating and treating both parent and satellite colonies. We use a combination of targeted baits, dust applications in wall voids, and perimeter treatments. Complete elimination may take 2-4 weeks as the colony's structure is complex. We also identify and recommend moisture repairs to prevent re-infestation.

Prevention

How to Prevent Carpenter Ants

Steps you can take to reduce the risk of infestation

1
Eliminate wood-to-soil contact around foundation
2
Fix all moisture problems and leaky pipes
3
Replace water-damaged wood promptly
4
Trim tree branches away from roof
5
Store firewood away from house and elevated
6
Ensure proper drainage away from foundation
FAQ

Carpenter Ants Questions Answered

Common questions about identification, prevention, and treatment

Are carpenter ants worse than termites?

Carpenter ants cause damage more slowly than termites but can still compromise structural integrity over time. Unlike termites, they don't eat wood—they excavate it for nesting.

How do I know if I have carpenter ants or regular ants?

Carpenter ants are much larger (6-13mm vs 2-4mm for pavement ants), usually solid black, and you may find sawdust-like debris (frass) near their activity.

Can I treat carpenter ants myself?

DIY treatments rarely eliminate carpenter ant colonies because they nest deep in wood structures and often have multiple satellite colonies. Professional treatment is recommended for complete elimination.

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