Reader support keeps this site open, opinionated, and happily independent. As an Amazon Associate, I earn from qualifying purchases.7 Best Black Widow Killer | Trusted Black Widow Killers

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The Hot Shot Spider & Scorpion Killer delivers a fast-acting aerosol formula that kills black widows in seconds, making it the top choice for immediate, visible threats. Its broad spray pattern reaches up to 5 feet, allowing you to target spiders hiding in high corners, under shelves, or behind appliances without getting too close. The water-based, non-staining formula dries clear and leaves only a mild citrus scent behind, so it won’t ruin paint or upholstery.

Beyond instant knockdown, this spray provides up to 4 months of residual control against ants, cockroaches, and crickets, and it kills black widow spiderlings as they hatch. This dual-action approach — immediate kill plus long-term barrier — makes it highly effective for active infestations. Customers consistently praise its pleasant scent and reliable performance compared to leading national brands.

For anyone who spots a black widow indoors and needs it gone right now, this aerosol is the most direct solution. Just be aware that it is a chemical insecticide, so ventilation during application is recommended, and it should be kept away from food prep areas and aquariums. Its 48-ounce total volume across three cans offers excellent coverage for multiple rooms.

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The Atticus Adjourn SC Concentrate packs the same active ingredient — 4.75% deltamethrin — trusted by professional pest control operators, but at a fraction of the cost. As a concentrate, you mix it with water in your own sprayer, making it ideal for treating large perimeter areas, foundation lines, and even interior baseboards where black widows travel. The odor-free formula dries clear and leaves zero staining on surfaces.

This is a broad-spectrum insecticide that kills spiders, ants, bedbugs, fleas, ticks, and wasps. Its residual power offers up to 90 days of control indoors and 30 days outdoors. The label allows direct application to mattresses and upholstery for bedbug control, which speaks to its versatility, though you will primarily use it as a perimeter spray against black widows. Customers report excellent results against chiggers and ticks as well.

One 16-ounce bottle makes up to 16 gallons of finished spray, so the value per application is exceptional for homeowners with larger properties. The trade-off is that it requires a pump sprayer and careful mixing, and it is not available for sale in Alaska, Hawaii, New York, or Vermont due to state regulations. If you prefer a ready-to-use product, this concentrate demands a bit more effort but rewards you with professional-grade performance.

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Miss Muffet’s Revenge Spider Killer is a ready-to-use spray that creates an invisible, long-lasting barrier specifically designed to keep spiders, including black widows, away. It kills water spiders and wolf spiders on contact within minutes, but its true strength lies in its repellent properties that prevent new webs from forming for weeks after a single application. A full 64-ounce bottle covers windows, doors, eaves, and garage perimeters generously.

Customer reports are striking: one user sprayed windows in April and reported zero spiders or webs come October. Another arachnophobe described it as completely eliminating webs on their front porch and garage for nearly a week after one thorough treatment. The formula is safe around kids and pets when dry, and it is effective in challenging climates like Florida, where wolf spiders and black widows are persistent.

The key consideration is that it requires a heavy initial spray to establish the barrier, and its longevity may drop to about 1.5 weeks in high-heat outdoor environments like Florida patios. It works best indoors, in garages, and on covered porches where rain does not wash it away. For homeowners who want a simple, no-mix solution to keep black widows from building webs in high-traffic areas, this is a standout choice.

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Black widows do not stay indoors — they breed in woodpiles, rock gardens, and tall grass around your home’s foundation. The Ortho Lawn Insect Killer Granules provide a 3-month outdoor barrier by killing listed ants, spiders, fleas, ticks, and pillbugs on contact both above and below the ground. One 20-pound bag treats up to 20,000 square feet, making it a powerful tool for homeowners serious about perimeter defense.

Application is straightforward: use a standard broadcast spreader to distribute the granules, water them in thoroughly, then allow the area to dry before re-entry. The granules release insecticide as they break down, creating a zone that spiders cannot cross without being killed. Customer feedback highlights its effectiveness against ant mounds and a notable reduction in visible insects across the treated lawn.

This is not an indoor solution; it is strictly for lawns, flower gardens, and the foundation perimeter. It also requires access to a hose for watering in the granules. For the seasonal control of black widow habitats outside your home, this granular treatment is the most comprehensive option. Pair it with an interior spray or traps indoors for a full-protection system.

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The RESCUE! Spider Trap stands out from basic cardboard glue boards thanks to its hard plastic shell that prevents collapsing, keeps curious pets away from the sticky surface, and hides captured spiders from view. This 6-trap pack covers an entire home, with each trap ready to use straight out of the box — no folding or assembly required. Simply place them along baseboards, under furniture, and near entry points where black widows travel.

The double-sided glue pattern extends the trap’s life: once one side fills with insects and spiders, flip it over to double the catching capacity. Customers confirm that these traps catch black widows, hobo spiders, brown recluses, and even cricket invaders. The hard case survives vacuum bumps and does not get caught under furniture legs, making it ideal for high-traffic areas.

The primary limitation is that very large spiders may occasionally walk across the glue without being fully trapped, as reported by one user. However, the overall efficacy against small-to-medium spiders is high. For a chemical-free, continuous monitoring system that is safe around dogs and children, the RESCUE! traps offer the best build quality and discretion in the glue trap category.

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The Terro Spider & Insect Traps deliver an impressive 16 traps per pack at a price that makes widespread home coverage affordable. These are classic flat glue traps that are pesticide-free and safe to use around pets and children. Each trap is extremely sticky and can be used flat for low-profile placement or folded into an L-shape for corners, which is precisely where black widows build their webs.

Customer reports include catching large spiders along with hundreds of spiderlings near HVAC vents, suggesting the traps are effective against both adults and hatchlings. One user with a severe spider bite reaction found that placing a trap in an L-shape caught a spider the very next day. The traps maintain their stickiness for months, providing long-term passive monitoring without any chemical odor.

The downsides are that the adhesive strength may vary slightly between batches, and larger, heavier spiders can sometimes struggle free if only a leg gets caught. Disposal is also an unpleasant task — you see exactly what you caught. For users who want maximum trap quantity to place in every room, garage, and basement corner, Terro offers the highest count of any option in this guide.

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The Harris Spider Glue Traps offer a straightforward, pesticide-free entry point for anyone new to glue trapping. Each trap is a large, foldable sheet of adhesive that you simply fold and lock with the built-in tab. Once set, the trap slides discreetly under furniture, beds, and appliances — exactly the dark, tight spaces where black widows hide during the day.

Customers report catching a variety of bugs, including crickets and spiders, and appreciate the lower price compared to local home improvement stores. The traps are useful for residential and commercial settings alike, though user experiences with spider-catching vary: some catch spiders immediately, while others see crickets and ants first. This suggests the lure may attract a broad range of insects, not exclusively spiders.

The main drawbacks are the small count (only 2 traps per pack) and the fact that some users found them completely ineffective against spiders in heavily infested areas. The traps also lack a protective shell, so they can stick to shoes or vacuum cleaners if placed carelessly. For a basic, low-cost trial to see if glue traps work in your environment, the Harris 2-pack is an acceptable starting point, but the RESCUE! or Terro options offer better reliability per trap.