8 Best Spider Killer Spray Outdoor 2025 in the United States

Ortho BugClear Insect Killer for Lawns & Landscapes Concentrate is a versatile outdoor insect spray designed to kill a wide range of bugs, including spiders, mosquitoes, ants, fleas, ticks, and periodical cicadas. One of its main strengths is its broad-spectrum efficacy, targeting 235 different types of insects. It begins working within minutes of application and offers long-lasting control, making it effective for persistent insect problems.

The product can be applied using an Ortho Dial N' Spray or a tank sprayer, ensuring ease of use for larger areas such as lawns and gardens, and it's suitable for use around a home's perimeter as well as on various plants, including ornamentals, flowers, trees, shrubs, and even listed vegetables and fruit trees. However, it's important to note that the concentrate cannot be applied directly from its container and requires careful dilution according to the product label instructions, which may be a bit inconvenient for some users.

Safety-wise, while the product is unscented and designed to be used outdoors, users should always follow safety instructions to avoid potential risks to pets and children. From an environmental standpoint, users should be mindful of its impact and apply it responsibly to minimize any adverse effects.

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 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.