10 Best Carpenter Ant Killers 2026 in the United States

The TERRO T300B Indoor Liquid Ant Killer with 12 bait stations is a highly effective solution for tackling indoor ant infestations. Its active ingredient, Borax, is well-known for its ant-killing properties. This liquid formulation ensures that ants are quickly attracted to the bait, which they then carry back to the colony, leading to a noticeable reduction in ant activity within a few days. This makes it an excellent choice for those dealing with a widespread ant problem indoors.

Spectracide Terminate Termite & Carpenter Ant Killer Concentrate is designed for outdoor use to protect your home from termites, carpenter ants, and other listed pests. It comes as a concentrated liquid that you mix with water before applying. This allows you to treat a large area—up to 16,000 square feet with one 32-ounce bottle—which is convenient if you have a sizable outdoor space like a porch, fence, or woodpile to protect. The product works by killing pests on contact and provides protection for up to 8 weeks, which means you don’t have to reapply very often. Many users find it effective at controlling carpenter ants and termites when applied around the foundation or other outdoor wooden areas. However, it is important to note that it is meant for localized control and outdoor use only, so it won’t treat termite infestations inside your home.

Hot Shot Ultra Liquid Ant Bait is designed mainly for indoor use to control common household ants, including carpenter ants. It uses an advanced liquid bait formulation that combines food and water to attract ants quickly and deliver a lethal dose within 24 hours. This bait targets not only worker ants but also the queen and colony, which is crucial for long-term ant control.