Spider Control in Columbus

Ohio has 624 known spider species, according to the Ohio Division of Wildlife's Common Spiders of Ohio field guide, with text by Richard A. Bradley. The guide says all but one have venom, but that venom "has little effect on humans or pets," and only two groups, the black widows and the recluse spiders, are considered dangerous. It adds that both are "relatively uncommon in Ohio."

If you are not sure what you found, a sharp photo is the fastest way to settle it.

The spiders Columbus homes actually get

Long-bodied cellar spider

The thin, long-legged spider in messy webs in the basement corners. The field guide calls it "one of the most common human-associated spiders in Ohio" and says it is likely responsible for most of the cobwebs in basements and cellars. Its spiderlings are small enough to pass through window screens, which the guide suggests is one reason the species has colonized most buildings in Ohio. It also eats other spiders, including wolf spiders many times its size.

Common house spider

The small mottled gray or tan spider with a tangled cobweb near a window. The guide says it is very common in and around most buildings in Ohio. One female can make up to a dozen egg sacs with several hundred eggs each, and the spiderlings also fit through screens.

Wolf spiders

The big, fast, hairy brown spider running across the basement floor or the garage in fall. The guide notes that field wolf spiders often wander into buildings in late autumn and squeeze under doors or through small cracks. Their size scares people, but the guide says they rarely bite, and that the bite "is not considered dangerous." A 2018 OSU Extension article names wolf spiders among the spiders most often mistaken for a brown recluse, along with funnel weavers and barn spiders.

False black widow

A shiny, dark, round-bodied spider in the garage that is not a black widow. The guide calls it very common in Ohio and "much more frequent than the black widow," and says it lacks the red hourglass. It is harmless.

Black widows and brown recluses in Ohio

Black widows live in Ohio but are not nearly as common here as in southern states. The field guide says they occur most often in the unglaciated southern part of the state. Only the female poses a bite risk. She is shiny black with a red hourglass on the underside, and her bite can be serious: the guide says anyone bitten should seek medical attention immediately. Most bites happen when someone reaches into or brushes against a web.

The brown recluse is the spider people ask about most, and here the record is precise. The field guide reports that the brown recluse "is represented by only nine specimens from three localities out of over 24,400 records in the Ohio Spider Survey database." It says there are no verified records of recluse spiders found outdoors in Ohio, and that the few records come from inside buildings. Most spiders sent in as brown recluses, it says, are misidentified common spiders, "even by medical or pest control professionals."

That does not mean zero. OSU Extension wrote in 2018 that brown recluses do survive well indoors in Ohio, though they are not known to survive winter outdoors here, and that they can arrive in moved furniture or household goods. Indiana State University's Indiana and Ohio Brown Recluse Project places Ohio's records in the southwest part of the state, becoming less common as you go north and east. The field guide also notes that the related Mediterranean recluse has been found in buildings in several Ohio cities.

To identify one, OSU says look at the eyes rather than the violin marking, which is subjective: a brown recluse has only six small eyes, arranged in three pairs. If you think you have one, catch it in a jar and get it identified before paying for a recluse treatment. A photo of the spider's head, taken close, is often enough.

On bites, the field guide is blunt. True spider bites are rare, and many wounds blamed on spiders, especially slow-healing ones, turn out to be bacterial infections such as MRSA. If you did not see a spider and cannot find a crushed one, a spider is not the likely cause. See a doctor for a wound that is spreading.

When spraying for spiders is poor value

For cellar spiders and house spiders, or the odd wolf spider, I would not pay for a spray program. The University of Kentucky's spider fact sheet (revised March 2026) calls most spiders "harmless and in fact beneficial because they prey upon flies and other pests," and says a vacuum or broom removes the spiders along with their webs and egg sacs. Spiders follow the insects they eat, so they keep coming back as long as insects keep getting in.

What works better, from that fact sheet:

• Vacuum webs and egg sacs regularly, especially in the basement and garage. Each sac can hold hundreds of spiderlings.
• Install tight window screens and door sweeps. UK says gaps under doors are a common way in.
• Switch porch and entry lights to yellow or sodium vapor bulbs, which attract fewer night-flying insects and so fewer spiders.
• Pull firewood and stored items away from the foundation, and trim shrubs and vines touching the house.
• Put glue traps flush along walls and in corners to see where spiders are coming from.

In an older Columbus house with a stone foundation and a damp basement, I would put the money into sealing and a dehumidifier before anything else. Fewer insects means fewer spiders, and the same work cuts down on centipedes and silverfish.

What a company should do

A spider visit that is worth paying for starts with an inspection, then focuses outside. UK describes outdoor barrier treatments along the foundation, focused on door thresholds and vents, which may need reapplying monthly or every two months in warm weather. Indoors, a thin film of dust in cracks and voids is the method UK names for black widow and recluse infestations. It says total-release foggers "are seldom effective against these spiders."

Expect the technician to knock down webs, point out where spiders and their prey are getting in, and tell you what to seal. For a confirmed black widow or recluse problem, UK recommends a professional, since those infestations take specialized skills and equipment. Ask whether spiders are covered by a general plan before paying for a separate spider treatment; see our general pest control page and one-time vs quarterly guide.

For a general treatment, This Old House (updated March 12, 2026) publishes a national range of $50 to $500 for a one-time visit. That is a national figure, not our quote.

We only refer companies that hold an Ohio Department of Agriculture pesticide business license and send licensed commercial applicators. Ask for a free inspection and a written price before any treatment.