The short version
Most spiders in Salt Lake City are harmless. Black widows live here, as in every lower-48 state. Salt Lake City 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 Salt Lake City who'd like fewer spiders, and peace of mind about the dangerous ones.
What to look for
Most are harmless and even helpful. Webs and egg sacs keep the cycle going. Spiders follow their food. More insects means more spiders.
- 1A shiny black spider with a red hourglass underneath.
- 2Round or teardrop egg sacs in eaves and frames.
- 3Spiders in a damp basement or crawl space.
- 4Dead insects wrapped in silk along ledges.
- 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
Most spiders found in Salt Lake City homes are harmless house spiders, cellar spiders or orb weavers. A careful look in Salt Lake City 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
In Salt Lake City, 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
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
Once webs are down, a technician in Salt Lake City applies a residual product along the foundation, around door and window frames, and under eaves. Spiders crossing those bands pick up the product.
- 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.
Lidded plastic bins beat open boxes and loose piles for keeping spiders out of stored clothes and bedding.Which spiders live around Salt Lake City.
Most spiders in Salt Lake City homes are house spiders, cellar spiders, jumping spiders and wolf spiders. All are harmless to people. Around Salt Lake City, they're western black widows, usually hiding under decks, grills and meter covers. Brown recluses don't live around Salt Lake City. Most suspects turn out to be harmless look-alikes. Hobo spiders are common in the Northwest. Despite their reputation, they aren't considered dangerous.
Local spiders conditions in Salt Lake City.
Salt Lake City sits in a semi-arid continental climate, and that sets the pace for spider activity here: late summer through fall (August-October). In Salt Lake City, 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 Salt Lake City usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing Salt Lake City'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 Salt Lake City and Utah 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.
Mesh and sealant around a pipe entry close off a gap spiders would otherwise use.When you’ll see more of them.
You'll see the most in late summer and fall. That's when males wander. Winter lows around 23°F in Salt Lake City slow spiders outside, but house spiders carry on indoors. Spring brings a new hatch. Clear egg sacs in winter.
Where they hide in houses here.
Plenty of homes in Salt Lake City have basements, and basements are spider central. Check window wells, storage areas and the sill plate. Clutter gives them endless hiding spots.
A year of spiders in Salt Lake City.
- Winter: with lows near 23°F in Salt Lake City, a good time to clear clutter and seal gaps. - Fall: males wander indoors. Peak spider season. - Summer: highs near 92°F in Salt Lake City bring more insects, and more spiders. - Spring: new spiderlings hatch. Vacuum webs and egg sacs.
Harmless or worth a closer look?
- 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. - Black widow: shiny black, red hourglass underneath. Leave it alone.
If you think you’ve been bitten.
If you can, safely catch the spider for identification. 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.
Fewer spiders, the easy way.
- 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. - Lights: yellow bug lights draw fewer insects.
Webs outside: leave some, clear some.
- 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. - Garden orb weavers: leave them. They catch flies and mosquitoes.
Spider myths.
- 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. - Swallowing spiders in your sleep: no evidence it happens.
Spiders and pets.
Ask the company which products are cat-safe. Some sprays are risky for cats. your vet. A widow bite can sicken a dog or cat. Most spiders are no threat to pets.
What a spider visit looks like.
Inside, they focus on corners, closets and the garage. 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.
Sticky traps tell you a lot.
They show which spiders you have and where they travel. Check them after a week. Set sticky traps along baseboards, behind furniture and in the garage.
Outdoor lights and spiders.
Motion-sensor lights help too. Yellow bulbs attract fewer bugs. Porch lights draw insects, and insects draw spiders.
Cellar spiders in the basement.
A dehumidifier and a broom keep them in check. They're harmless and even eat other spiders. Long-legged cellar spiders hang in basement corners.
Spiders in the garage.
A door sweep and a sticky trap by the door help. Store things in sealed bins off the floor. Garages collect webs, boxes and insects.
Questions to ask before you sign.
- 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? - Which spiders did you find?
What affects the price
- Bundling with an existing general pest plan.
- Number of follow-up visits included.
- Door sweeps, screens and sealing work.
- One-time visit versus recurring plan.
- Inclusion of web and egg-sac removal.
- Eave depth and roofline height.
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What's your biggest concern about spiders?
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
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 Salt Lake City
Salt Lake City only gets about 16 inches of rain a year, so spiders gather where insects find water: garages, sprinkler zones and shaded walls. In denser parts of Salt Lake City, spiders favor stairwells, garages, basements and window frames.
Local research
Spiders in Salt Lake City, UT: what the public record shows
Before you compare quotes, it helps to know which spiders actually live in Utah, when they are busiest around Salt Lake City, and what the state figures look like. Everything below links to the agency or university page it came from.
Hobo spider detection in Pacific Northwest
An introduced European species that has since spread across the Intermountain West.
Utah State University ExtensionSpider species recorded in Utah
- Hobo spider (Eratigena agrestis) — European funnel weaver 'detected in the Pacific Northwest in 1936', now 'throughout northern Utah' and 'throughout Washington'. Current extension/health stance: not medically si…
When spiders are busiest around Salt Lake City
'They are frequently found in Utah homes from August through October' as males seek mates (USU).
'This species is now distributed throughout northern Utah.' 'No significant scientific evidence suggests that hobo spiders have a necrotic (flesh-eating) bite' (USU).
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: Hobo Spider; 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.
- Seal gaps around pipes, cables and vents.
- Check meter boxes and grills before reaching in.
- Repair torn window and vent screens.
- Clear leaf litter and debris from foundations.
- Shake out shoes and clothing left on floors.
Under-sink cabinets get checked for gaps around pipes, which spiders and their prey both use.Did you know?
Some spiders can survive months without a meal
Spiderlings travel miles by ballooning on silk threads
Questions people ask
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.
Why do spiders keep coming back after I clean?
Usually because the insects they eat are still around. Egg sacs and gaps around doors also keep them coming.
How do I know if I have a black widow?
Don't handle it. They hide under furniture, grills and meter covers. Look for a shiny black spider with a red hourglass underneath.
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.
Do brown recluses live in my area?
Probably not. Utah is outside the brown recluse range.
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 Salt Lake City, ask each company what's typical on your street.
What does a spider spray cost?
Local quotes vary; ask for a written estimate. Expect a pro in Salt Lake City to connect the plan to what they actually found at your home.
Are there dangerous spiders in Salt Lake City?
Black widows, yes, as almost everywhere. Most other spiders here are harmless.
When are spiders worst in Salt Lake City?
Late summer and fall, when males wander.
Nearby cities
Related guides
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