How long do carpenter ants in a house wall last during fall and winter?

Carpenter ants inside a house wall can survive fall and winter for several months to over a year, depending on indoor conditions and the size of the colony. Here’s how it works:

🐜 Carpenter Ants and Cold Weather: What Happens?

1. Outdoors: In nature, carpenter ants go into diapause (a hibernation-like dormant state) during late fall and winter, typically in logs, stumps, or deep in the soil where temperatures are stable.

2. Indoors (House Walls): If the colony is inside a heated wall or structure, they may not go fully dormant, especially if:

⏳ How Long Can They Last?

• Dormant state (if cold, unheated wall): They can survive the whole winter (up to 6 months or more), essentially “sleeping” and consuming minimal resources.

• Active (if wall is warm): They may stay active through winter, continuing to slowly chew wood, forage at night, and expand the nest.

• A well-established indoor colony can last years if not removed.

🛑 Signs You May Have a Winter Carpenter Ant Problem:

• Ants spotted indoors during winter (especially in kitchens, bathrooms, or basements).

• Faint rustling or clicking sounds in walls.

• Frass (sawdust-like debris) near baseboards or windows.

• Winged ants (swarmers) in early spring – a sign of a mature nest.

✅ What to Do:

• Inspect for moisture problems – carpenter ants prefer damp wood.

• Seal food sources and clean regularly.

• Use bait stations or contact Go Green Pest Control if activity continues in cold months.

• Go Green Pest Control may need to drill and treat the wall voids if a nest is established inside.

• https://gogreenpestcontrol.ca/how-long-do-carp…-fall-and-winter/
• https://insectandrodentexterminators.com/how-long-do-carpenter-ants-in-a-house-wall-last-during-fall-and-winter/
• https://www.linkedin.com/pulse/how-long-do-carpenter-ants-house-wall-last-during-fall-randy-bilesky-xzeac