7 Best Spider Killer Spray Outdoor 2025 in the United States

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 Ant, Roach & Spider Killer comes in a convenient twin pack with two 17.5-ounce aerosol cans. It is designed for both indoor and outdoor use, effectively targeting a variety of insects including ants, cockroaches, and spiders. This spray boasts a fast knockdown effect, killing insects on contact and continuing to work for up to 3 months on non-porous surfaces, though it does exclude certain species like fleas, carpenter ants, pharaoh ants, and fire ants.

The active ingredients, Imiprothrin and Lambda-Cyhalothrin, are known for their effectiveness in pest control, making this product potent against a wide range of pests. However, this potency may come with safety and environmental considerations; users should handle it with care and follow safety instructions to avoid exposure risks. The aerosol spray application method makes it easy to use, although it might not be as precise as some other application methods.

This product is a strong contender for those seeking a versatile insecticide that can handle a variety of pests, both inside and outside the home. Yet, the exclusion of certain pests and the potential safety and environmental concerns should be weighed before use.

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.