The short version
Most spiders in Somerville are harmless. Black widows live here, as in every lower-48 state. Somerville 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.
Anyone in Somerville who's spotted a spider and wants to know if it matters.
What to look for
Spiders follow their food. More insects means more spiders. Most are harmless and even helpful. Webs and egg sacs keep the cycle going.
- 1Webs behind shutters, meter boxes and utility panels.
- 2Spider activity in the garage near the door gap.
- 3Shed spider skins on windowsills and baseboards.
- 4Small flying insects gathering under exterior lights.
- 5Fresh cobwebs in corners days after cleaning them.
- 6Many tiny spiders in one spot after a hatch.
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
The spiders found in most Somerville homes are harmless house spiders, cellar spiders or orb weavers. A careful look in Somerville 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
A good pro in Somerville works high and low: gable vents, light fixtures, deck undersides and the gap behind shutters. Those spots stay webbed because nobody looks there.
- Time
- 30–90 minutes
- Best for
- Visible webbing on eaves, porches, sheds and basements
Sealing Gaps, Lighting and Prey Reduction
$150–$450
Expect a quote based on the work, not a flat fee. A pro should show you which gaps matter.
- Time
- 1–4 hours
- Best for
- Long-term reduction; homes near woods, water or fields
Exterior Perimeter Treatment and Void Dusting
$150–$350
Confirmed widows or recluses mean treating their hiding spots. Think crawl spaces, boxes, woodpiles and outdoor furniture.
- Time
- 45–120 minutes
- Best for
- Heavy exterior activity, widows or recluses confirmed
Prices are typical published ranges. Ask what’s included before you compare quotes.
Stacked boxes against a garage wall are a favorite hiding spot; check them before you move them.Which spiders live around Somerville.
All are harmless to people. Around Somerville, they're northern black widows, usually hiding under decks, grills and meter covers. Brown recluses don't live around Somerville. Most suspects turn out to be harmless look-alikes. Most spiders in Somerville homes are house spiders, cellar spiders, jumping spiders and wolf spiders.
Local spiders conditions in Somerville.
Across Somerville, 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 Somerville usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing Somerville'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 Somerville and Massachusetts 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. Somerville sits in a humid continental climate, and that sets the pace for spider activity here: late summer through fall (August-October).
Leaf piles against the foundation are prime fall shelter for spiders looking for a way inside.When you’ll see more of them.
That's when males wander. Winter lows around 22°F in Somerville 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 Somerville have basements, and basements are spider central.
A year of spiders in Somerville.
- Winter: with lows near 22°F in Somerville, a good time to clear clutter and seal gaps. - Spring: new spiderlings hatch. Vacuum webs and egg sacs. - Summer: highs near 82°F in Somerville bring more insects, and more spiders. - Fall: males wander indoors. Peak spider season.
Harmless or worth a closer look?
- Orb weaver: big round web outside. Harmless. - Black widow: shiny black, red hourglass underneath. Leave it alone. - Brown recluse: tan, violin mark on its back, plain legs. - Wolf spider: big, hairy and fast. Harmless. - Cellar spider: tiny body, very long legs. Harmless. - Jumping spider: small, fuzzy, hops. Harmless.
If you think you’ve been bitten.
Use a cool compress. Raise the area if you can. See a doctor for severe pain, cramping or spreading redness. If you can, safely catch the spider for identification. Wash the bite with soap and water.
Fewer spiders, the easy way.
- Beds: keep them a few inches from the wall. - Lights: yellow bug lights draw fewer insects. - Gaps: add door sweeps and repair screens. - Clutter: store things in sealed plastic bins, not cardboard. - Webs: vacuum webs and egg sacs every few weeks. - Shoes and gloves: shake them out before use.
Webs outside: leave some, clear some.
- Gloves: wear them when moving firewood, pots or patio cushions. - Garden orb weavers: leave them. They catch flies and mosquitoes. - Doorways and porch lights: brush webs away weekly. - Eaves and window frames: a long-handled brush works well. - Woodpiles: keep them off the ground and away from the house.
Spider myths.
- Every blister is a recluse bite: most aren’t spider bites. - Swallowing spiders in your sleep: no evidence it happens. - Daddy longlegs are deadly: no. They’re harmless. - Spiders move in for winter: most house spiders never leave.
Spiders and pets.
A widow bite can sicken a dog or cat. your vet. Some sprays are risky for cats. Ask the company which products are cat-safe. Most spiders are no threat to pets.
What a spider visit looks like.
The tech walks the outside first. They knock down webs and egg sacs around eaves and windows. They treat cracks, gaps and hiding spots, not open lawn. Inside, they focus on corners, closets and the garage. Most visits take about an hour.
Sticky traps tell you a lot.
Check them after a week. They show which spiders you have and where they travel. Set sticky traps along baseboards, behind furniture and in the garage.
Outdoor lights and spiders.
Yellow bulbs attract fewer bugs. Motion-sensor lights help too. Porch lights draw insects, and insects draw spiders.
Cellar spiders in the basement.
They're harmless and even eat other spiders. A dehumidifier and a broom keep them in check. Long-legged cellar spiders hang in basement corners.
Spiders in the garage.
Store things in sealed bins off the floor. A door sweep and a sticky trap by the door help. Garages collect webs, boxes and insects.
Questions to ask before you sign.
- When can kids and pets go back in? - Which spiders did you find? - Where will you treat, inside and out? - Is web and egg-sac removal included? - Will you seal gaps or add door sweeps? - What happens if they come back?
What affects the price
- Bundling with an existing general pest plan.
- Inclusion of web and egg-sac removal.
- Crawl space or basement access and moisture.
- One-time visit versus recurring plan.
- Wooded, wet or open-field surroundings.
- Number of follow-up visits included.
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What's your biggest concern about spiders?
When to call for help
if spiders keep coming back after cleaning. High eaves and attics are worth leaving to a pro. Call if a black widow is near where kids play.
What you can do yourself
Skip foggers. They don't reach hiding spots. A pro adds targeted treatment in cracks and voids. Start simple. Switch to yellow bug lights. Add door sweeps and store things in sealed bins.
Spiders in Somerville
With about 47 inches of rain a year and humidity near 67%, Somerville supports plenty of insects, and spiders follow them. In denser parts of Somerville, spiders favor stairwells, garages, basements and window frames. Somerville has a humid continental climate, and spiders activity here tends to pick up late summer through fall (August-October). Across Somerville, most of the housing is urban, so the usual entry points, moisture spots, and sheltered areas near the structure are what an inspection checks first. Across Somerville, take a minute to note where you have seen activity and when it appears, so the inspection is faster and the quote more accurate. A local provider who knows Somerville and Massachusetts can point out the specific conditions that matter most here before you commit to a plan.
Local research
Spiders in Somerville, MA: what the public record shows
Before you compare quotes, it helps to know which spiders actually live in Massachusetts, when they are busiest around Somerville, and what the state figures look like. Everything below links to the agency or university page it came from.
When spiders are busiest around Somerville
Late summer–early fall. Hunting spiders 'may enter into homes accidentally, particularly in the fall' and 'do not survive well indoors and usually do not reproduce indoors'. 'Funnel web spiders are the most common spiders found in homes, particularly during late summer and early fall'. 'The brown recluse (Loxoceles reclusa) is rare in Colorado because of our cold winters and dry climate' (same source), and 'Neither black widow spiders or brown recluse are native to the upper Midwest and are rarely encountered' (UMN). Cobweb and cellar spiders persist indoors year-round.
Based on Somerville’s humid continental climate profile.
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: CDC/NIOSH. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep spiders away
- Move fixtures away from doors where possible.
- Fix leaks and standing water in crawl spaces.
- Seal gaps around pipes, cables and vents.
- Wear gloves when handling outdoor furniture.
- Inspect items brought in from sheds and garages.
- Install door sweeps on every exterior door.
Compare quotes on what they include: web removal, treatment, sealing and any follow-up visit.Did you know?
Some spiders can survive months without a meal
Cellar spiders hunt and eat other spiders, including widows
Questions people ask
How do I choose a spider control company?
Check that they're licensed in Massachusetts. Ask them to identify the spiders before treating. Ask what's included and what happens if they come back.
What attracts spiders to a house?
Food, mostly. Spiders follow insects to porch lights, damp spots and clutter. Cut the insects and spiders follow.
Is spider treatment safe for pets and children?
Applied by the label, yes. Keep kids and pets away until treated areas dry. Ask what product they'll use.
Do brown recluses live in my area?
Probably not. Massachusetts is outside the brown recluse range.
Do spider sprays actually work?
Store-bought sprays kill what they touch. They rarely reach hiding spots. Removing webs and egg sacs and sealing gaps works better.
Why are there so many spiders in my basement?
Bertone and colleagues found spiders in 92.6% of 54 North Carolina basements in 2012.
How much is quarterly pest control for spiders?
Local quotes vary; ask for a written estimate. Expect a pro in Somerville to connect the plan to what they actually found at your home.
Are there dangerous spiders in Somerville?
Black widows, yes, as almost everywhere. Most other spiders here are harmless.
When are spiders worst in Somerville?
Late summer and fall, when males wander.
Nearby cities
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Sources (12)
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