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.

The product's design allows for easy placement along baseboards, in corners, and on counters, effectively targeting common household ants such as acrobat, crazy, ghost, little black, odorous house, and pavement ants, among others. Users will appreciate the ready-to-use feature, which requires no setup and provides a hassle-free application method.

Safety-wise, Borax is generally considered safe when used as directed, but it is always important to keep it out of reach of children and pets. The residual effect is strong as it continues to attract and kill ants over time, ensuring long-term control. The TERRO T300B is a reliable and user-friendly option for those needing an indoor ant control solution with minimal effort and maximum results.

The TERRO T1813B Outdoor Ready-to-Use Liquid Ant Bait Stake Killer Trap is designed to attract and eliminate common household ants, including carpenter ants, using 12 liquid bait stakes.

Its active ingredient effectively eliminates both the ants you see and those in the colony, ensuring a comprehensive solution. The liquid formulation is highly attractive to ants, leading them to consume the bait and share it with the colony, which helps in eradicating the entire nest within a few days. This makes it a fast-acting solution for ant infestations.

Another advantage is its ease of use; simply insert the stakes into the ground and cut the tab to activate, making it a hassle-free option for outdoor ant control. Its design is specifically tailored for outdoor use, addressing the issue at its source before ants can enter your home. The TERRO T1813B offers an effective, easy-to-use solution for outdoor ant control.

BioAdvanced Carpenter Ant & Termite Killer Plus is a liquid concentrate designed to control more than 75 different pests, including carpenter ants and termites, which are common wood-damaging insects. Its active ingredients are EPA-approved, making it a reliable choice for outdoor pest control around your home, such as lawns, decks, and landscaping. The product comes in a one-gallon bottle with a pump sprayer that has an adjustable nozzle, which makes applying the insecticide easier and more precise, even for those unfamiliar with pest control products.

It creates a protective barrier that can cover a large area—up to 21,000 square feet—helping to prevent infestations before they start. Because it targets a wide range of insects, it offers good value if you deal with various pests, not just carpenter ants. Since it is formulated for outdoor use only and requires mixing with water, it might not be the best pick if you need something ready-to-use or safe for indoor application.

While the product meets EPA specifications for safety, it is important to follow label instructions carefully to avoid exposure, especially around children and pets. This product is a solid option if you want a versatile, strong, and relatively easy-to-use outdoor treatment for carpenter ants and other pests, but users should handle the concentrate safely and be prepared to reapply as needed.