6 Best Spider Killer Spray Outdoor 2025 in the United States

The Ortho Home Defense Insect Killer for Lawn & Landscape Ready-To-Spray is a convenient solution for dealing with outdoor insects, including spiders, ants, ticks, mosquitoes, and fleas. One of its main strengths is its fast-acting formula, which starts killing insects within minutes and provides long-lasting control for up to three months. This makes it an effective option for users looking to create a barrier against bugs entering their homes.

The product covers a large area, treating up to 5,300 square feet with a single 32-ounce bottle, and its application is straightforward—simply attach it to your garden hose and spray, with no need for mixing or measuring. This ease of use is a significant advantage for those who prefer hassle-free solutions.

While the residual effect can last up to three months for some insects, its effectiveness may vary depending on environmental conditions and the specific pest issue. Additionally, safety is a crucial factor; although people and pets can re-enter the treated area once it dries, users must ensure proper application to avoid potential health risks. Users should be mindful of the product's potential effects on non-target species and follow the label instructions carefully to minimize any harm. Lastly, if you have specific concerns about black widow spiders, note that this product does not cover them.

Wet & Forget 803064 Miss Muffet's Revenge Indoor and Outdoor Spider Killer comes across as a powerful and convenient solution for keeping spiders at bay. Its active ingredient, Bifenthrin, is known for its effectiveness in killing spiders and creating a long-lasting barrier. With a residual effect of up to 12 months, it offers a robust defense against spider infestations with just one application. This can be a great advantage for users looking for a long-term solution without frequent reapplications.

The attached sprayer is a thoughtful addition, making it easy to apply the spray even in hard-to-reach areas with a range of up to 10 feet. This makes it practical for both indoor and outdoor use, ensuring comprehensive coverage. However, the product's efficacy is limited to spiders other than Black Widow and Brown Recluse, which might be a concern for some users. The application requires calm weather and 24 hours without rain, which can be a bit inconvenient for those in unpredictable climates.

Safety is a consideration, as the treated area must be left undisturbed until completely dry, which might be a hassle in busy households or outdoor spaces frequently in use. Environmentally, Bifenthrin can be harmful to aquatic life, so caution is necessary to avoid contamination of water bodies. Despite these drawbacks, Miss Muffet's Revenge stands out for its ease of use, long-lasting effect, and the convenience of being ready to use right out of the bottle.

The Hot Shot Spider & Scorpion Killer is an aerosol spray designed to kill spiders and scorpions quickly, including dangerous species like black widows and brown recluses. One of its standout features is its fast-acting formula, which kills these pests in seconds. Additionally, it provides residual protection, continuing to kill ants, cockroaches, and crickets for up to 4 months, which is a significant advantage for long-term pest control.

The spray offers up to a 5-foot reach, ensuring a broad area of coverage, and its water-based non-staining formula leaves no residue or lingering odors, which makes it more user-friendly for outdoor use. However, as with any chemical spray, there are safety considerations. Users should handle it with care to avoid inhalation or skin contact, and it should be kept away from children and pets.

While the product is effective and provides extended protection, its environmental impact is a concern since it is a chemical pest control method, and great care should be taken to limit its use to targeted areas to minimize any broader ecological harm. The Hot Shot Spider & Scorpion Killer is best suited for individuals dealing with serious spider and scorpion infestations who need an efficient and long-lasting solution with easy application.