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Pest Control Services Nationwide Pest Control Services Nationwide Cellar spiders are the long-legged spiders most homeowners notice hanging upside down in basement and garage corners. The body is small, around 6 to 10 millimeters, pale tan or gray and almost see-through, but the legs run five to seven times that length, which creates the distinctive look people call daddy long-legs. They are true spiders, not harvestmen, and the two are often confused. Cellar spiders have two body segments and live in messy tangled webs; harvestmen have one fused body and no web at all.
If you're seeing tiny pale spiders with extremely thin legs perched upside down inside loose, irregular webs in upper corners of basements, garages, attics, or dark closets, you're looking at cellar spiders. They are harmless to people and actually useful, because they eat other spiders. This guide covers how to confirm them, what behaviors to watch for, and the small number of cases where a single visit from a pro makes sense.
ID Card: Cellar Spider
Related Species
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Cellar spiders pick the quietest, least-disturbed corners of a building and stay there. Once a web is established, the spider rarely leaves it. Walking the right rooms with a flashlight pointed up is how you map a population:
If you find webs in three or more of these zones, you have an established cellar spider population that has been growing slowly over years. That isn't a problem the way an ant trail or a rodent run is a problem, because cellar spiders aren't damaging anything or carrying disease. The decision to treat is almost always about how the webs look, not about safety. Many pest control philosophies actually recommend leaving cellar spiders alone, since they're predators of other spiders including species that do bite people.
Spotting webs is step one. Understanding why cellar spiders settled into your home is what tells you whether anything actually needs to change. Cellar spiders are not invading the way ants or rodents invade. They live indoors. Heated buildings with low-traffic basements and garages are exactly the year-round habitat they evolved to use, and once a few individuals settle in, the population builds slowly across years without much intervention from outside.
What anchors them to your property:
A new web starts when a juvenile cellar spider disperses from its mother's web and settles into a nearby corner, usually within a few feet. Each female produces three or more egg sacs per year, and she carries each sac in her mouthparts for several weeks until the spiderlings hatch. That carrying behavior is one of the best field IDs for cellar spiders, because almost no other indoor spider does it. The population builds quietly across the lifespan of the adults, which can run one to three years.
Find your scenario below. Cellar spiders are harmless and beneficial, so severity here reflects how the webs look and how the household feels about them, not medical risk.
| What You're Seeing | Severity | If Untreated | Next Step |
|---|---|---|---|
| One cellar spider in a basement corner, no other webs visible | Early | A single cellar spider in a quiet corner is the normal state of most homes; the population will grow slowly across years rather than spiking | Ignore it. Confirm the ID first, long thin legs, two body segments, hanging upside down in a messy web. A single beneficial predator is doing free pest work for you. |
| Multiple cellar spiders in basement and garage with visible webs | Moderate | Web density will continue to build slowly across months and years, but the population is self-limiting based on indoor prey supply | Run an extended duster across corners once or twice a year if the webs bother you. Chemical treatment is almost never warranted at this stage. |
| Heavy web density throughout living spaces, frequent sightings in bathrooms and closets | High-aesthetic | Population has spread well beyond the typical basement and garage harborage; web visibility in the main living areas is what's driving the call | Schedule a single pro residual visit to reduce the population. Also worth reducing other indoor flying insects since cellar spiders self-regulate around prey supply. |
| Family member with insect-sting allergy or strong fear of spiders, frequent encounters | Moderate-elevated | Cellar spider bites are not known to cause serious reactions, but household stress and avoidance behavior is a real quality-of-life issue worth addressing | Call a pro for a single population-reduction visit. Confirm the species on arrival to rule out medically significant spiders that may be sharing the harborage. |
Cellar spiders are harmless. If you're between two rows, treat the higher one as your situation, but recognize most homes can leave them alone.
Cellar spiders live one to three years as adults, which is long for a household spider. Each individual stays in roughly the same web for most of its life, so populations build slowly across years inside undisturbed buildings rather than spiking in any one season. The lifecycle below explains why heavy infestations almost always reflect a structure that has been quietly hosting cellar spiders for a while.
Carried 3 to 4 weeks until hatch
Each female produces three or more egg sacs per year, with 13 to 60 eggs per sac. Unlike most spiders, the female holds the sac in her mouthparts for the entire incubation period rather than anchoring it to the web. Seeing a small pale cluster being carried by a female is one of the clearest field IDs for the species.
Disperse within days of hatching
Newly hatched spiderlings stay clustered near the mother briefly, then disperse to nearby corners to start their own webs. Most disperse only a few feet, which is why cellar spider populations tend to spread room by room rather than across a whole house at once.
About 1 year through five molts
Juveniles progress through five molts over roughly a year, getting larger with each molt. The discarded exoskeletons collect in the web below the spider, which is often mistaken for dead spiders by homeowners. By the final molt the legs reach their full length, which is when most people first notice them.
Adults live 1 to 3 years; some species longer
Adult cellar spiders settle into a permanent web and stay there for most of their remaining life. Females produce multiple egg sacs per year across the adult phase, so a single female in a corner can contribute well over a hundred offspring to the population across her lifespan.
An established cellar spider population in an older building can include dozens to hundreds of individuals across all life stages, distributed across basement, garage, attic, and crawl space corners. Because the spiders are long-lived and stay in place, the population builds slowly across years rather than swarming in any one season. That is also why a single residual visit can suppress visible numbers for a long stretch.
Cellar spiders inside heated buildings stay active all year, because indoor temperatures don't drop into the dormancy range. The seasonal pattern below describes when egg production peaks and when web density tends to be most visible.
Egg sac production picks up as days lengthen. Females visibly carry pale clusters in their mouthparts, which is when many homeowners first notice them. Spiderlings begin dispersing into new corners across the basement and garage, expanding the visible web count.
Indoor populations reach their seasonal peak. Outdoor cellar spider populations under decks, porches, and outbuildings expand in mild climates. Web density in basements, garages, and crawl spaces is at its most visible, and adult females may produce multiple sacs in succession.
Egg production continues at a steady pace. Some outdoor individuals move into garages and basements ahead of cooler weather, but most populations are already established indoors. Web counts hold steady while juveniles continue molting toward adult size.
Indoor populations remain fully active in heated structures. Outdoor cellar spiders go dormant in cold climates, but indoor females continue producing egg sacs and adult webs stay in place. The slow lifecycle means winter is one of the better windows for a single-visit treatment if one is needed.
Cellar spiders are one of the few household pests where the honest answer is often to leave them alone. They don't bite people in any meaningful sense, their venom is not dangerous, and they actively reduce other spider populations including black widows and brown recluses. Most homeowners can manage a cellar spider population with an extended duster once or twice a year, and that's the whole job.
There's a long-running urban legend that daddy long-legs are the most venomous spider in the world but cannot bite through human skin. That story is false on both counts. Cellar spider venom has been tested and is not unusually potent, and the fang-length claim is irrelevant since the venom isn't dangerous regardless. The myth has stuck around for decades because it sounds like trivia, but it doesn't reflect any real measurement.
Professional treatment makes sense in a small number of scenarios: when web density has built up to where the household won't tolerate it, when the spiders have spread heavily into living spaces, or when a family member has a serious fear of spiders that's affecting daily life. In those cases a single visit with web removal and a corner residual usually suppresses the population for months, and no recurring program is needed.
A typical single-visit cellar spider job runs $100 to $200. Compare that to recurring ant or rodent programs and the cost is modest. But for most homes the math doesn't justify even the single visit, since the spider is harmless and the webs are easy to vacuum on a routine basis.
Cellar spider treatment is one of the simplest jobs in the industry, because the spider is harmless and slow-moving. A specialist's main job is to confirm the species, remove the existing webs, and apply a single residual to the corners that hold them. Here's what changes:
They Confirm the Species The pro looks for the two-segment body, the extremely long thin legs, the messy tangled web, and the vibration defense behavior. They also rule out medically significant spiders that may share the same corners, so you know what you're actually dealing with.
They Remove Webs Across the Whole Property An extended duster reaches the ceiling corners, beams, rafters, and high closet corners that homeowners can't easily access. Removing the existing webs and egg sacs gives the residual a clean baseline to work from.
They Apply a Single Targeted Residual A spot residual in the upper corners reduces the population over the following weeks. Cellar spiders are not aggressive and don't bud or scatter the way ants do, so a single visit is usually enough. No recurring program is needed.
They Tell You When to Leave Them Alone A good specialist will explain the beneficial predator role. Cellar spiders eat black widows and brown recluses in lab settings. In a garage or unfinished basement, leaving a few in place often reduces the more concerning spiders you don't want.
Cellar spiders are the rare pest situation where DIY handles almost every case effectively. The species is harmless, the webs are easy to remove, and the spider rarely fights back against treatment.
DIY handles most cellar spider situations completely. The work is mostly identification, web removal, and tolerance:
A pro visit makes sense in a narrow set of cases, primarily when web density bothers the household or a family member has serious arachnophobia. Here's what changes:
Cellar spiders are harmless, but heavy web density can be worth a single visit. Connect with a local specialist who can confirm the species, clear the webs, and apply a targeted residual in one trip.
Real results from people who had the same problem and solved it.
"Basement spiders finally under control."
Every fall, spiders would move inside as temperatures dropped. The pro treated the basement and entry areas and explained how to reduce the conditions that attract them. It made a noticeable difference right away.
"Basement spiders finally under control."
Every fall, spiders would move inside as temperatures dropped. The pro treated the basement and entry areas and explained how to reduce the conditions that attract them. It made a noticeable difference right away.
"Brown recluse spiders, finally handled."
We found brown recluse spiders in the garage and a closet. The tech explained their habits and treated the areas where they hide. Knowing what to watch for gave us peace of mind.
"Fall spider invasion handled."
Every autumn, spiders would take over the garage and porch. The tech treated those areas and explained what draws them indoors when temperatures drop. The difference was immediate.
"Garage cleared of spiders."
Black widow spiders were nesting in the garage corners. The tech cleared the webs, treated the area, and explained how to keep the space less inviting. It's been months without any new webs appearing.
"Basement spider population knocked down fast."
Our basement had become a spider haven. The tech treated the entire lower level and explained how reducing clutter and moisture would help long-term. The spider population dropped significantly within a couple of weeks.
"Spiders cleared from window frames."
Every fall, spiders would cluster around our window frames. The tech treated the exterior and explained how light attracts insects, which in turn attract spiders. Reducing the conditions made a noticeable difference.
"Brown recluse spiders cleared from closets."
Finding brown recluse spiders in multiple closets was frightening. The tech treated the interior thoroughly and explained how to make storage areas less attractive to them. We've been checking regularly and haven't found any since.
"Crawl space spiders identified and cleared."
Our crawl space had a significant spider population including some we couldn't identify. The provider treated the area and explained which species are common in Kentucky. Knowing what we were dealing with helped a lot.
"Damp basement cleared of spiders."
The damp basement was full of spiders and webs. The provider treated the area and recommended a dehumidifier to reduce the moisture that attracts them. The spider population dropped noticeably within weeks.
"Crawl space spider habitat cleared."
Our crawl space was full of spider webs and egg sacs. The provider cleared and treated the area and explained how the moisture down there creates an ideal habitat. Adding ventilation and treatment together made a lasting difference.
"Storage room cleared of brown recluse spiders."
We found brown recluse spiders while organizing a storage area. The provider treated the room and surrounding spaces and explained how to make storage areas less inviting. The careful approach put us at ease.
"Log cabin spider problem managed."
Our cabin-style home attracted a lot of spiders. The provider treated the interior and exterior and explained how the wood siding creates perfect hiding spots. Regular treatments have kept the problem manageable.
"Porch webs and spiders cleared up."
Our porch light attracted insects and spiders followed. The provider treated the porch area and suggested switching to yellow bulbs that attract fewer bugs. The spider webs have been much less of a problem since.
"Garage black widows cleared and prevented."
We found black widow webs in multiple corners of the garage. The provider treated the garage thoroughly and explained how to keep it less attractive to spiders. Regular inspections and treatment have kept it clear.
"Stone foundation spiders finally manageable."
Our stone foundation basement was perfect spider habitat. The provider treated the perimeter and interior and explained how sealing cracks in the old stonework helps. The basement is much more comfortable now.
"Patio cleared of black widow nests."
We found black widow webs under outdoor furniture and along the foundation. The provider treated the yard and exterior thoroughly and explained how the warm, dry climate makes them common here. The treatment worked well.
"Basement and upstairs cleared of spiders."
Our basement was full of spider webs and we kept finding them upstairs too. The provider treated both levels and explained how basements in North Dakota homes provide ideal shelter. The improvement was obvious within weeks.
"Brown recluse spiders, finally handled."
We started finding brown recluse spiders in closets and the garage. The provider did a thorough treatment and explained their behavior patterns. They also recommended reducing clutter in storage areas, which helped significantly.
"Detached garage cleared of spiders."
Our detached garage had become a spider haven. The tech treated the interior and sealed the gaps around the door and windows. They explained that garages are prime spider habitat because of the insects attracted to the light.
"Crawl space spider population brought down."
The crawl space under our house had a large spider population. The pro treated the area and installed better ventilation. They explained how reducing moisture in crawl spaces naturally reduces spider activity over time.
"Basement webs and spiders cleared."
Our basement was full of spiders and webs every season. The tech treated the space and explained how reducing humidity and clutter makes it less hospitable. The spider population has been much lower since.
"Attic spiders identified, treated, and cleared."
We found spider webs throughout the attic and worried about brown recluses. The tech identified the species and treated the attic, garage, and crawl space. They explained how insulation provides hiding spots and recommended sealing gaps near the roofline.
"Basement spider population cut down."
Our basement had cobwebs in every corner and we kept finding large spiders near the laundry area. The tech treated inside and out and explained how reducing other insects would cut the spider population since they follow their food source.
"Garage cleared of black widow nests."
We found black widow webs behind boxes in the garage and near the water heater. The tech cleared the webs, treated the area, and recommended reducing clutter. They explained widow habits so we could spot early signs of return.
"Closets cleared of brown recluse spiders."
We found brown recluses in the bedroom closets and were afraid to reach for clothes. The tech did a thorough treatment of closets, attic, and crawl space. They placed glue traps for monitoring and the activity dropped quickly.
"Window wells cleaned out and spider-free."
Basement window wells were full of spider webs and insects. The tech treated the wells, cleaned them out, and sealed gaps around the window frames. They suggested adding well covers to reduce debris and insect activity.
"Basement storage reclaimed from spiders."
The unfinished basement was full of spider webs and egg sacs. The tech treated the entire basement, removed webs, and explained that reducing moisture and clutter makes the space less attractive to spiders and their prey.
"Brown recluse spiders identified and treated."
We found what looked like a brown recluse in the garage and panicked. The provider identified the species, treated the garage and crawl space, and placed monitoring traps. They educated us on how to recognize recluse spiders versus harmless look-alikes.
"Pool cage spiders cleared and webs gone."
Large orb weaver spiders built webs all over the pool enclosure every night. The provider treated the cage frame and surrounding landscaping. Reducing the insect population that attracted the spiders was the key to long-term control.
"Screened porch cleared of spider webs."
Every corner of the screened porch had webs and large spiders. The provider treated inside the screen enclosure and the exterior perimeter. Reducing landscape lighting near the porch cut down the insect prey that attracted spiders.
"Closets cleared of cane spiders."
Large cane spiders kept appearing in closets and behind furniture. The provider treated the interior and exterior and cleared out harborage areas. They explained that cane spiders are mostly beneficial but understood our comfort concerns.
"Window wells cleared of black widows."
We found black widows in multiple basement window wells. The provider treated the wells, cleared debris, and sealed gaps around the windows. They recommended well covers to keep insects and spiders from using them as shelter.
"Unfinished basement spider count down sharply."
The basement had spiders in every corner and behind storage shelves. The provider treated the entire space and explained that reducing clutter and moisture cuts the insect population that spiders feed on. The improvement was dramatic.
"Brown recluse spiders cleared throughout the house."
We found brown recluse spiders in closets, the garage, and the basement. The provider did a thorough treatment and placed sticky traps for monitoring. They explained that reducing clutter eliminates hiding spots these spiders prefer.
"Back porch cleared and webs gone."
Every morning, new webs stretched across the porch doorway. The provider treated the porch and surrounding area. Reducing outdoor lighting near the porch cut down the flying insects that attracted the spiders.
"Whole-house recluse treatment fully resolved."
My son was reaching for a winter coat in the basement closet when he saw one drop down the sleeve. That was enough for me. The inspector found shed skins behind the dryer and treated the closets, garage, and the gap behind the water heater. Monitoring traps catch the occasional straggler. Knock on wood, no bites in the house, and the kids know not to grab clothes without shaking them out.
"High-risk areas cleared of brown recluse spiders."
We kept finding brown recluses in the basement and laundry room. The provider treated all the high-risk areas and set up monitoring traps. They explained how to reduce clutter and seal boxes to minimize hiding spots.
"Playroom cleared safely for the kids."
Finding spiders in the playroom worried us about the children's safety. The provider identified the species, treated the room and surrounding areas, and explained how to reduce conditions that attract spiders indoors.
"Basement corners cleared and dehumidified."
The damp basement was full of spider webs and egg sacs. The provider treated the basement and recommended a dehumidifier. Reducing moisture cut down the insect prey that attracted spiders in the first place.
"Basement spiders down sharply with moisture control."
The basement had webs in every corner and large spiders near the sump pump. The provider treated the entire basement and sealed cracks in the foundation walls. Reducing moisture with a dehumidifier helped long-term.
Direct answers to what homeowners ask most about identification, the daddy long-legs myth, and when treatment is actually warranted.
Cellar spiders (often called daddy long legs spiders) are frequently confused with brown recluse spiders because of their similar light-brown coloring, but the two are easily distinguished. Cellar spiders have extremely long, thin legs relative to a small, elongated body and build messy, irregular webs in corners, basements, and garages, and theyare almost always found hanging upside-down in their web. Brown recluses have proportionally shorter, thicker legs, do not hang in webs (they are hunting spiders active at night), and possess the distinctive violin marking and six-eye pattern. Cellar spiders are completely harmless and actually prey on other spiders and insects, including brown recluses when they share habitat.
Cellar spiders are beneficial predators that feed on mosquitoes, flies, gnats, and even other spider species including brown recluses and black widows, makingthem arguably the most helpful spider to have in your home. They are completely harmless to humans, cannot deliver a medically significant bite, and do not damage any household materials. The primary reason people remove them is aesthetic: their prolific web-building creates unsightly cobwebs in corners, ceilings, and basements. If web accumulation is the concern, periodic web removal with a broom or vacuum is sufficient, thespiders themselves are providing a valuable pest control service at no cost.
Spiders follow their food source, other insects. If you have a recurring spider problem, it almost always means you also have an underlying insect population (gnats, flies, ants, or moths) that's attracting them. Reducing exterior lighting that draws insects, sealing cracks around windows and doors, and addressing the prey insects will significantly reduce spider activity indoors.
Most house spiders are harmless and actually beneficial, and theyeat other pests. However, two species in the U.S. Pose genuine medical risks: the brown recluse and the black widow. Brown recluse bites can cause tissue necrosis, and black widow bites cause severe muscle pain and cramping. If you're in an area where either species is common, identification matters.
Most providers in our network can schedule an inspection within 24-48 hours. For urgent situations, likeactive structural damage or large colonies, same-week emergency service is often available. Response times depend on your location and the provider's current schedule.
Your provider inspects the property to identify the pest, locate nesting or entry points, and assess the scope of the problem. You get a clear explanation of what they found, what they recommend, and a written scope before any work begins.
Modern pest control products are designed to break down quickly after application and pose minimal risk to people and pets when applied correctly. Most providers ask you to keep kids and pets out of treated areas for 1 to 2 hours while the product dries, after which the area is generally safe again. Always confirm specific re-entry times with your provider, and let them know about pet birds, fish, or reptiles, since some treatments require extra precautions for those species.
Black widow spiders have venom 15 times stronger than a rattlesnake's and hide in dark, undisturbed areas like garages, woodpiles, and outdoor furniture. Their bites cause severe muscle pain and cramping that may require medical attention.
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Brown recluse spiders hide in boxes, closets, and seldom-disturbed storage areas, delivering bites that can cause necrotic skin lesions requiring medical treatment. They are identified by a distinctive violin-shaped marking on their back.
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Hobo spiders build funnel-shaped webs at ground level along foundations, window wells, and basement floors. They are poor climbers and fast runners that occasionally bite when trapped in clothing or bedding, causing localized pain and swelling.
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Common house spiders spin tangled webs in window frames, corners, and light fixtures throughout the home. They are harmless and help control other insects, but their persistent webs in living areas are a cosmetic nuisance for homeowners.
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Jumping spiders are compact, large-eyed hunters that stalk prey on walls, windows, and surfaces rather than building webs. They occasionally enter homes through gaps and are harmless to people, though their sudden jumping movements can be startling.
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Orb weaver spiders build large, impressive circular webs on porches, eaves, and garden areas. While beneficial for catching insects, their large webs across walkways and doorways are a common nuisance for homeowners.
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Wolf spiders are large, fast-running ground hunters that enter homes through gaps in foundations and under doors, especially in fall. They don't build webs and are often mistaken for brown recluses, but their bites are only mildly painful.
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Yellow sac spiders are the most common source of spider bites in the United States, delivering painful bites often while people sleep. They build small silk retreats in wall corners rather than typical webs.
Learn MoreLocal providers who handle cellar spider work as a single-visit job are ready to confirm the species, clear the webs, and apply a corner residual, no obligation.
