How many carpenter ants are in a colony?

“How many carpenter ants are in a colony? And how many queen ants?”

A mature carpenter ant colony typically contains 3,000 to 15,000 workers, depending on the species and the colony's age. Some species found in warmer states like Florida can have colonies of 50,000 or more ants. A mature black carpenter ant colony (the most common species found in homes) usually contains around 2,000 to 3,000 workers, though colonies can grow well beyond that over time.

The foragers you see at night represent only a small fraction of the population. So if you're regularly spotting 20 or 30 carpenter ants trailing across your kitchen, the colony behind them could number in the thousands.

One thing that’s important to understand is that a carpenter ant colony isn't always in one place. There's typically a parent nest (where the queen lives and eggs are laid), often in damp or decaying wood, and one or more satellite nests in drier locations, such as wall voids, hollow doors, or attics. The ants you see indoors could be a satellite nest connected to a parent colony that's actually outside in a tree stump or rotting fence post.

That's why effective carpenter ant control means locating and treating both the satellite and parent nests.

Do carpenter ants have a queen?

Carpenter ants do have a queen, and there’s usually just one. The queen carpenter ant is the only member of the colony that lays eggs, and she can live up to 25 years. She's also larger than the workers: queen carpenter ants measure roughly 0.5 to 0.75 inches in length.