The short version
Most spiders in Great Falls are harmless. Black widows live here, as in every lower-48 state. Great Falls 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 Great Falls 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.
- 1Silk strands stretched across windows after wind.
- 2Fresh cobwebs in corners days after cleaning them.
- 3Webs under deck boards and outdoor furniture.
- 4Tan spider with a violin mark and six eyes.
- 5Spiders wandering across walls at night.
- 6Spiders in bathtubs and sinks in late summer.
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
What turns up in Great Falls homes is mostly harmless: house spiders, cellar spiders and orb weavers. A careful look in Great Falls 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
Sealing Gaps, Lighting and Prey Reduction
$150–$450
Moths and midges come to bright white porch lights, and spiders come for the moths and midges; switching Great Falls porch lights to warm-color LEDs cuts the food supply. Yellow bulbs away from doors make a real difference.
- Time
- 1–4 hours
- Best for
- Long-term reduction; homes near woods, water or fields
Exterior Perimeter Treatment and Void Dusting
$150–$350
Ask what product is used and why it fits your Great Falls situation. Labels vary, and the choice should be explained plainly.
- Time
- 45–120 minutes
- Best for
- Heavy exterior activity, widows or recluses confirmed
Web and Egg-Sac Removal
$100–$250
Physical removal comes before any product. A technician in Great Falls brushes down webs and egg sacs from eaves, soffits, window frames and porch ceilings with a pole brush or vacuum.
- Time
- 30–90 minutes
- Best for
- Visible webbing on eaves, porches, sheds and basements
Prices are typical published ranges. Ask what’s included before you compare quotes.
Basements stay dark, damp and quiet, which is everything a spider wants.Which spiders live around Great Falls.
Brown recluses don't live around Great Falls. Most suspects turn out to be harmless look-alikes. Hobo spiders are common in the Northwest. Despite their reputation, they aren't considered dangerous. Most spiders in Great Falls homes are house spiders, cellar spiders, jumping spiders and wolf spiders. All are harmless to people. Around Great Falls, they're western black widows, usually hiding under decks, grills and meter covers.
Local spiders conditions in Great Falls.
An inspection in Great Falls usually starts outside and works inward, checking the foundation, gaps around doors and windows, and any moisture or clutter near the structure first. Knowing Great Falls'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 Great Falls and Montana 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. Great Falls sits in a semi-arid continental climate, and that sets the pace for spider activity here: late summer through fall (August-October). For Great Falls homes, the area is mostly suburban, 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.
A vent that closes properly keeps spiders from using it as a winter doorway.When you’ll see more of them.
Winter lows around 13°F in Great Falls 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. That's when males wander.
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 Great Falls have basements, and basements are spider central.
A year of spiders in Great Falls.
- Fall: males wander indoors. Peak spider season. - Summer: highs near 85°F in Great Falls bring more insects, and more spiders. - Spring: new spiderlings hatch. Vacuum webs and egg sacs. - Winter: with lows near 13°F in Great Falls, a good time to clear clutter and seal gaps.
Harmless or worth a closer look?
- 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. - Orb weaver: big round web outside. Harmless.
If you think you’ve been bitten.
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. See a doctor for severe pain, cramping or spreading redness.
Fewer spiders, the easy way.
- 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. - Beds: keep them a few inches from the wall.
Webs outside: leave some, clear some.
- 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. - Gloves: wear them when moving firewood, pots or patio cushions.
Spider myths.
- 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. - Every blister is a recluse bite: most aren’t spider bites.
Spiders and pets.
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. Some sprays are risky for cats.
What a spider visit looks like.
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. They treat cracks, gaps and hiding spots, not open lawn.
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.
- 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? - When can kids and pets go back in?
What affects the price
- Whether outbuildings, sheds and decks are included.
- Number of follow-up visits included.
- Door sweeps, screens and sealing work.
- One-time visit versus recurring plan.
- Amount of clutter in garage, basement and storage.
- Bundling with an existing general pest plan.
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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 Great Falls
An inspection in Great Falls that starts outside and works inward usually finds the entry points, moisture, and shelter that matter most before anyone treats. Great Falls has a semi-arid continental climate, and spiders activity here tends to follow late summer through fall (August-October). In Great Falls's neighborhoods, eaves, porch lights, woodpiles and garages are spider favorites. Great Falls only gets about 14 inches of rain a year, so spiders gather where insects find water: garages, sprinkler zones and shaded walls.
Local research
Spiders in Great Falls, MT: what the public record shows
Before you compare quotes, it helps to know which spiders actually live in Montana, when they are busiest around Great Falls, and what the state figures look like. Everything below links to the agency or university page it came from.
Spider species recorded in Montana
- Western black widow (Latrodectus hesperus) — 'The black widow spider, Latrodectus hesperus, is the most common harmful spider in California' and 'occur in most parts of California' (UC IPM); 'common in Colorado' (CSU); Lat…
- 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 Great Falls
Western black widows are present throughout Montana and shelter in woodpiles, burrowing sites and low-traffic areas around homes; MSU Extension emphasizes habitat modification near entrances (MSU Urban IPM).
MSU Extension Urban IPM: 'The brown recluse is not native to Montana' and no specimen has ever been positively identified in the state by a trained arachnologist or entomologist; 'it is extremely unlikely that any diagnosed spider bite from this area is from a brown recluse.' A recluse could only arrive as a hitchhiker in shipments or boxes.
Rules that apply in Montana
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: Montana State University Extension Urban IPM; CDC/NIOSH; Pest Notes: Spiders (PN 7442); Hobo Spider. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep spiders away
- Stack firewood well away from the house.
- Store items in sealed plastic bins, not cardboard.
- Check meter boxes and grills before reaching in.
- Put exterior lights on motion sensors.
- Run a dehumidifier in damp basements.
- Close windows at night or use tight screens.
A quick room-by-room note of where you've seen spiders makes the inspection faster.Did you know?
Orb weavers often eat and rebuild their web nightly
Weight for weight, spider silk is stronger than steel.
Questions people ask
How do I choose a spider control company?
Ask what's included and what happens if they come back. Ask them to identify the spiders before treating. Check that they're licensed in Montana.
Will treatment get rid of all the spiders?
A few outside help control other pests. The goal is fewer spiders indoors. No, and that's fine.
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.
Is spider treatment safe for pets and children?
Ask what product they'll use. Keep kids and pets away until treated areas dry. Applied by the label, yes.
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.
How much does spider extermination cost?
As you collect quotes in Great Falls, ask each company what's typical on your street. For Great Falls homes, for homeowners the range is a benchmark, and the technician's inspection sets the actual price. For Great Falls homes, catching a spider problem early keeps it in the cheapest bracket, as Local quotes vary; ask for a written estimate.
Is monthly spider control worth it?
Expect a pro in Great Falls to connect the plan to what they actually found at your home. Local quotes vary. For Great Falls homes, monthly visits roughly double the annual cost of quarterly ones, based on Local quotes vary; ask for a written estimate. Only for heavy or persistent activity.
Are there dangerous spiders in Great Falls?
Black widows, yes, as almost everywhere. Most other spiders here are harmless.
When are spiders worst in Great Falls?
Late summer and fall, when males wander.
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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