The short version
Most spiders in Philadelphia are harmless. Black widows live here, as in every lower-48 state. Philadelphia is outside the brown recluse range, so most 'recluses' here are look-alikes. Identify first, then treat.
- Most house spiders are harmless.
- Black widows live in every lower-48 state.
- Brown recluses don’t live here.
- Skip foggers; they don’t reach hiding spots.
- Yellow bug lights and door sweeps help a lot.
Homeowners and renters in Philadelphia who'd like fewer spiders, and peace of mind about the dangerous ones.
What to look for
Webs and egg sacs keep the cycle going. Most are harmless and even helpful. More insects means more spiders. Spiders follow their food.
- 1Fresh cobwebs in corners days after cleaning them.
- 2Webs across doorways or gates each morning.
- 3Spiders in a damp basement or crawl space.
- 4Messy, funnel-shaped webs in shrubs and grass.
- 5Tan spider with a violin mark and six eyes.
- 6Webs under deck boards and outdoor furniture.
Why it’s worth acting soon
- Egg sacs hatch hundreds of spiderlings.
- Webs build up in eaves, corners and garages.
- Widows nest under outdoor furniture and grills.
Treatment options and typical costs
Inspection and Species Identification
$75–$200
Most spiders found in Philadelphia homes are harmless house spiders, cellar spiders or orb weavers. A careful look in Philadelphia separates those from a black widow or, where they occur, a brown recluse.
- Time
- 45–90 minutes
- Best for
- Every job; the species decides how much to do
Web and Egg-Sac Removal
$100–$250
Across Philadelphia, the exterior comes first, followed by garages, basements and crawl spaces. The debris is bagged rather than left to hatch.
- Time
- 30–90 minutes
- Best for
- Visible webbing on eaves, porches, sheds and basements
Exterior Perimeter Treatment and Void Dusting
$150–$350
Ask what product is used and why it fits your Philadelphia situation. Labels vary, and the choice should be explained plainly.
- Time
- 45–120 minutes
- Best for
- Heavy exterior activity, widows or recluses confirmed
Sealing Gaps, Lighting and Prey Reduction
$150–$450
Spiders follow food. Fewer insects outside does more than any single treatment. Lighting and sealed gaps help most.
- Time
- 1–4 hours
- Best for
- Long-term reduction; homes near woods, water or fields
Prices are typical published ranges. Ask what’s included before you compare quotes.
Where brown recluses live, they like quiet spots under beds and furniture, so a flashlight check along the frame is worth a minute.Which spiders live around Philadelphia.
All are harmless to people. Around Philadelphia, they're northern black widows, usually hiding under decks, grills and meter covers. Brown recluses don't live around Philadelphia. Most suspects turn out to be harmless look-alikes. Most spiders in Philadelphia homes are house spiders, cellar spiders, jumping spiders and wolf spiders.
Local spiders conditions in Philadelphia.
Across Philadelphia, the area is mostly urban, so spiders pressure can differ from one block to the next depending on how tight the entry points are and how much food, water, or shelter is close by. An inspection in Philadelphia usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing Philadelphia's seasonal timing lets you schedule treatment before the busy stretch rather than after it, which usually means faster service and a more accurate quote. A provider who works Philadelphia and Pennsylvania every day can point out the specific conditions that matter most here, and getting the scope, price, and follow-up terms in writing makes it easier to compare options. Philadelphia sits in a humid subtropical climate, and that sets the pace for spider activity here: late summer through fall (August-October).
Mesh and sealant around a pipe entry close off a gap spiders would otherwise use.When you’ll see more of them.
That's when males wander. Winter lows around 26°F in Philadelphia slow spiders outside, but house spiders carry on indoors. Spring brings a new hatch. Clear egg sacs in winter. You'll see the most in late summer and fall.
Where they hide in houses here.
Check window wells, storage areas and the sill plate. Clutter gives them endless hiding spots. Plenty of homes in Philadelphia have basements, and basements are spider central.
A year of spiders in Philadelphia.
- Spring: new spiderlings hatch. Vacuum webs and egg sacs. - Winter: with lows near 26°F in Philadelphia, a good time to clear clutter and seal gaps. - Fall: males wander indoors. Peak spider season. - Summer: highs near 87°F in Philadelphia bring more insects, and more spiders.
Harmless or worth a closer look?
- Black widow: shiny black, red hourglass underneath. Leave it alone. - Orb weaver: big round web outside. Harmless. - Jumping spider: small, fuzzy, hops. Harmless. - Cellar spider: tiny body, very long legs. Harmless. - Wolf spider: big, hairy and fast. Harmless. - Brown recluse: tan, violin mark on its back, plain legs.
If you think you’ve been bitten.
See a doctor for severe pain, cramping or spreading redness. Raise the area if you can. Use a cool compress. Wash the bite with soap and water. If you can, safely catch the spider for identification.
Fewer spiders, the easy way.
- Lights: yellow bug lights draw fewer insects. - Beds: keep them a few inches from the wall. - Shoes and gloves: shake them out before use. - Webs: vacuum webs and egg sacs every few weeks. - Clutter: store things in sealed plastic bins, not cardboard. - Gaps: add door sweeps and repair screens.
Webs outside: leave some, clear some.
- Garden orb weavers: leave them. They catch flies and mosquitoes. - Gloves: wear them when moving firewood, pots or patio cushions. - Woodpiles: keep them off the ground and away from the house. - Eaves and window frames: a long-handled brush works well. - Doorways and porch lights: brush webs away weekly.
Spider myths.
- Swallowing spiders in your sleep: no evidence it happens. - Every blister is a recluse bite: most aren’t spider bites. - Spiders move in for winter: most house spiders never leave. - Daddy longlegs are deadly: no. They’re harmless.
Spiders and pets.
Some sprays are risky for cats. your vet. A widow bite can sicken a dog or cat. Most spiders are no threat to pets. Ask the company which products are cat-safe.
What a spider visit looks like.
They treat cracks, gaps and hiding spots, not open lawn. They knock down webs and egg sacs around eaves and windows. The tech walks the outside first. Most visits take about an hour. Inside, they focus on corners, closets and the garage.
Sticky traps tell you a lot.
Check them after a week. Set sticky traps along baseboards, behind furniture and in the garage. They show which spiders you have and where they travel.
Outdoor lights and spiders.
Yellow bulbs attract fewer bugs. Porch lights draw insects, and insects draw spiders. Motion-sensor lights help too.
Cellar spiders in the basement.
They're harmless and even eat other spiders. Long-legged cellar spiders hang in basement corners. A dehumidifier and a broom keep them in check.
Spiders in the garage.
Store things in sealed bins off the floor. Garages collect webs, boxes and insects. A door sweep and a sticky trap by the door help.
Questions to ask before you sign.
- Which spiders did you find? - When can kids and pets go back in? - What happens if they come back? - Will you seal gaps or add door sweeps? - Is web and egg-sac removal included? - Where will you treat, inside and out?
What affects the price
- Wooded, wet or open-field surroundings.
- Number of follow-up visits included.
- Whether outbuildings, sheds and decks are included.
- Crawl space or basement access and moisture.
- Inclusion of web and egg-sac removal.
- Home size and number of stories.
📊
What's your biggest concern about spiders in your home?
When to call for help
Call if a black widow is near where kids play. if spiders keep coming back after cleaning. High eaves and attics are worth leaving to a pro.
What you can do yourself
Start simple. Switch to yellow bug lights. Add door sweeps and store things in sealed bins. Skip foggers. They don't reach hiding spots. A pro adds targeted treatment in cracks and voids.
Spiders in Philadelphia
An inspection in Philadelphia that starts outside and works inward usually finds the entry points, moisture, and shelter that matter most before anyone treats. Philadelphia has a humid subtropical climate, and spiders activity here tends to follow late summer through fall (August-October). In denser parts of Philadelphia, spiders favor stairwells, garages, basements and window frames. With about 47 inches of rain a year and humidity near 68%, Philadelphia supports plenty of insects, and spiders follow them.
Local research
Spiders in Philadelphia, PA: what the public record shows
Before you compare quotes, it helps to know which spiders actually live in Pennsylvania, when they are busiest around Philadelphia, and what the state figures look like. Everything below links to the agency or university page it came from.
Black widow deaths
Bites are serious but survivable; the main concern is prompt medical care.
Penn State ExtensionSpider species recorded in Pennsylvania
- Southern black widow (Latrodectus mactans) — 'Found in the southeastern region and has been found as far north as Ohio and as far west as Texas' (UF/IFAS); confirmed in Pennsylvania (Penn State) and one of two dangerous sp…
- Northern black widow (Latrodectus variolus) — Penn State: 'It is probable that the northern black widow, L. variolus, is also present' in Pennsylvania; UF/IFAS lists it among Florida's four widow species. Hourglass often sp…
- Joro spider (Trichonephila clavata) — 'Established in Georgia, North Carolina, South Carolina, Tennessee, Alabama, and spreading to adjacent regions. There are also isolated populations found in Maryland, Virginia,…
When spiders are busiest around Philadelphia
'The majority of widow bites occur' in 'the summer months' (Penn State).
'The southern black widow, L. mactans, is found in Pennsylvania. It is probable that the northern black widow, L. variolus, is also present' (Penn State). Isolated joro populations reported in Pennsylvania (UGA). No brown recluse breeding range in PA per UC Riverside boundaries.
For context, nationally
- Throughout North America, but are most common in the southern and western United States — Black widow distribution. CDC/NIOSH
- In the midwestern and southern United States — Brown recluse distribution. CDC/NIOSH
Sources: Southern Black Widow Spider; CDC/NIOSH; EENY 560: Southern Black Widow, Latrodectus mactans; Joro Spider: Trichonephila clavata (Circular 1273). Figures are quoted as the source prints them. How we check our sources
Simple ways to keep spiders away
- Run a dehumidifier in the cellar through the humid months to cut the small flies spiders eat.
- Pour water into rarely used floor drains and unused traps so drain flies cannot breed there.
- Fit a door sweep on the basement and rear alley doors where daylight shows underneath.
- Vacuum joists, stairwell undersides, and window wells monthly rather than once a season.
- Store basement and shed items in sealed bins raised off the floor instead of cardboard.
- Move a woodpile off the ground and away from the house wall, and wear gloves when handling logs.
- Switch porch and rear yard bulbs to warmer colors so fewer insects gather on the wall.
- Repair window screens before the first cool nights of September, when wandering starts.
Under-sink cabinets get checked for gaps around pipes, which spiders and their prey both use.Did you know?
Cellar spiders hunt and eat other spiders, including widows
Male black widows are tiny, patterned and harmless
Questions people ask
Why are there suddenly so many spiders in fall?
It usually settles down in a few weeks. Many end up indoors by accident. Males wander in late summer and fall looking for mates.
Can I just leave the spiders alone?
Most house spiders are harmless and eat other pests. Widows are the exception, so check under outdoor furniture.
What attracts spiders to a house?
Cut the insects and spiders follow. Spiders follow insects to porch lights, damp spots and clutter. Food, mostly.
Do spider sprays actually work?
Removing webs and egg sacs and sealing gaps works better. They rarely reach hiding spots. Store-bought sprays kill what they touch.
Is a spider bite what I think it is?
See a doctor if a bite spreads, blisters or hurts badly. Many 'spider bites' are really other insects or skin infections. Often not.
Is it normal to find spiders in your bedroom?
Yes. Spiders were present in 75.6% of the 160 bedrooms that Bertone and colleagues inspected across 50 North Carolina homes in 2012. As you collect quotes in Philadelphia, ask each company what's typical on your street.
How much is quarterly pest control for spiders?
Across Philadelphia, between $350 and $750 a year is Local quotes vary; ask for a written estimate. A good pro in Philadelphia can explain why their plan matches what they found at your place.
Are there dangerous spiders in Philadelphia?
Black widows, yes, as almost everywhere. Most other spiders here are harmless.
When are spiders worst in Philadelphia?
Late summer and fall, when males wander.
Nearby cities
Related guides
Sources (18)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Spider Exterminator · Updated September 11, 2026 · How we write these guides