Thank you for your question!

Unfortunately, it's difficult to determine from the attached photo whether the insect is a carpenter ant. Carpenter ants can be identified by their large size, a single-node waist (petiole), and a smoothly rounded thorax when viewed from the side. If possible, could you send a clearer, close-up photo? That would help with identification.

The University of Minnesota Extension has an excellent resource on carpenter ants that you may find helpful: https://extension.umn.edu/insects-infest-homes/carpenter-ants.

If the insect does turn out to be a carpenter ant, the most effective control method is to locate and eliminate the nest. Carpenter ants do not eat wood, but they excavate it to create nesting galleries. They commonly nest in moisture-damaged wood, wall voids, hollow doors, insulation, or decaying wood outdoors. Because nests are often hidden and can be difficult to locate, the University of Minnesota recommends working with an experienced pest management professional for established infestations. Simply spraying ants that are seen indoors is usually not effective because it does not eliminate the colony.

As a homeowner, you can help by:

- Looking for sources of excess moisture and repairing leaks.

- Replacing water-damaged wood.

- Storing firewood away from the house.

- Trimming tree branches that touch the roof or exterior walls.

- Observing ant activity in the evening to determine where ants may be entering or nesting.

Unfortunately, we do not maintain a recommended exterminator vendor list. If you choose to hire a professional, look for a licensed pest management company with experience locating and treating carpenter ant nests.

If you're able to provide a clearer photo, we'd be happy to take another look.

- Victoria

University of Minnesota Extension Master Gardener Volunteer

Thank you for sending the photo. I've forwarded the images to one of our entomology experts for review. I'll get back to you as soon as I hear back from them.

-Victoria
University of Minnesota Extension Master Gardener

Thank you for your patience. I shared your photos with some experts and unfortunately the images are not clear enough to make a confident identification.

The ant in your photos could be a carpenter ant (Camponotus spp.), but it may also be a field ant (Formica spp.), which can look very similar. The most reliable way to distinguish between these ants is by examining the shape of the thorax from a side view. Because the current photos do not show that feature clearly, we are unable to confirm the identification.

You may find this resource helpful, as it includes photos and descriptions of several ant species that are commonly confused with carpenter ants:

https://yardandgarden.extension.iastate.edu/encyclopedia/ants-iowa-common

If you're able to obtain a sharp, close-up photo, (especially a side view of the ant), please feel free to send it in and we would be happy to take another look.

-Victoria

University of Minnesota Extension Master Gardener Volunteer