Carpenter ant
Camponotus pennsylvanicus
- Identification
- Large black ants, ¼ to ½ inch, with a single node and evenly rounded thorax. Winged reproductives appear in spring.
- Lifecycle & behavior
- A parent colony (often outdoors) sends workers to establish satellite nests in structures. Colonies mature over years.
- When it's active in Central NY
- The defining ant of Central New York. Most active spring through summer, foraging at night; may appear indoors on warm winter days from an interior nest.
- Risk & damage
- Excavate galleries in moisture-damaged wood to nest — not eating it, but weakening structural members over time. Leave sawdust-like frass.
- Why DIY falls short
- Repellent sprays kill foragers and can split the colony into more satellite nests, worsening the problem.
- How we treat it
- Locating the parent and satellite nests, non-repellent baiting the colony carries back, and correcting the moisture that drew them.
Carpenter ant or termite?
This is the most consequential identification in the library, because the two are treated completely differently and one is far more common here. Look at the waist, the antennae, and the wings. A carpenter ant has a narrow pinched waist, elbowed antennae, and — if winged — two pairs of wings of noticeably different lengths. A termite has a broad, straight-sided waist with no pinch, straight beaded antennae, and two pairs of wings of equal length.
The damage differs too. Carpenter ants excavate galleries that are smooth and clean, and they push out coarse sawdust-like frass containing insect body parts. Termites pack their galleries with mud and soil and leave them rough. Finding clean galleries and a little pile of what looks like pencil shavings under a beam is a carpenter ant sign.
Carpenter ants in Central New York
Carpenter ants are the region's most important structural insect by a wide margin, and moisture is always the underlying story. They do not eat wood — they excavate it — and they overwhelmingly choose wood that has been softened by water. In the Finger Lakes that means the sill plate and band joist behind a failed gutter, framing near a chronically damp hillside basement wall, window and door frames under a leak, and porch columns and roof edges.
The timing tell is a spring swarm. Winged reproductives appearing indoors in April or May are not ants that wandered in — they indicate a mature colony that has been inside the structure through the winter. That is a meaningfully different situation from foragers crossing a counter in July, and it deserves a proper inspection rather than a spray.
Dealing with carpenter ant?
Our carpenter ant control handles it — guaranteed, family-owned, and local.
Carpenter ant — common questions
I found winged ants indoors in April. What does that mean?
Usually that a mature carpenter ant colony has been living inside the structure through the winter, not that ants wandered in from outside. Indoor spring swarmers are a strong indicator of an established interior nest and are worth a full inspection.
Do carpenter ants eat wood like termites?
No. They excavate galleries to nest in and push the debris out — that is the coarse sawdust-like frass you find. Termites actually consume wood and pack their galleries with soil. The distinction matters because carpenter ant control centers on finding the nest and fixing the moisture that attracted it.