Carpenter Ant (Camponotus spp.)

Structural Pest • Wood Damage • Major CT Ant Species

Carpenter Ant – Connecticut Identification & Structural Risk Guide

The carpenter ant is Connecticut’s most important structural ant species. These large, black ants excavate wood to create nesting galleries and are commonly found in older homes, moisture-damaged wood, and attics.

Identification:

• Size: ¼–½ inch
• Color: Black (sometimes red/black)
• Waist: One node
• Shape: Smooth rounded thorax
• Behavior: Slow, steady movement

Workers forage at night, appearing around sinks, dishwashers, and window frames.

Behavior & Habitat:

Carpenter ants do not eat wood—they excavate it.

Common nesting sites:

• Moist wood
• Attics
• Door frames
• Behind siding
• Rooflines
• Decks

Moisture problems often attract carpenter ants.

Why Carpenter Ants Are Common in CT:

Connecticut’s:

• Snow melt
• Humid summers
• Old home construction
• Roof leaks

…create ideal nesting conditions.

They often swarm in April–June, a key sign of an active colony.

Signs of a Carpenter Ant Infestation:

• Large black ants in kitchen/bath
• Piles of sawdust-like frass
• Winged ants indoors
• Soft or damaged wood
• Rustling noises in walls

When to Call a Professional:

Because colonies may have multiple satellite nests, professional treatment is essential.

Ant Control CT 

Additional Links:

• Moisture Pest Page 
• General Pest Control 
• Pest Prevention