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To keep spiders from moving into your home for the winter, focus on the places they use to sneak inside and block them. A few targeted fixes and regular habits stop most eight-legged visitors and reduce the insects that attract them.
Why spiders come indoors and what to watch for
Spiders are not trying to be pests; they are following warmth and food. When temperatures drop, they look for sheltered spots with prey. That means your house becomes attractive.
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Finding one spider often signals more. Spiders feed on smaller insects, so their presence can point to an underlying pest issue. If you see a spider indoors, check for more insects and potential entry points.
Easy tests to locate where spiders enter
Before sealing anything, confirm which gaps are active. Two simple tests help you pinpoint problem spots.
- Flashlight check: At night, shine a bright light along baseboards, window frames, and foundation cracks. Movement or glints of webbing can reveal traffic patterns.
- Tape test: Press clear tape over a suspected opening. Inspect the tape after a day or two for dust, tiny insects, or silk threads.
Also inspect vents, dryer exhaust, and spaces around pipes. Damaged screens, warped door bottoms, and foundation fissures are common entry routes.
Tools and materials for sealing entry points
Use easy-to-find materials to create a near-impenetrable barrier. Match the fix to the gap size and location.
- Silicone or latex caulk for small gaps around windows and trim.
- Expanding spray foam for larger voids near utilities and foundation seams.
- Door sweeps and weather stripping to close gaps under exterior doors.
- Hardware mesh for vents and openings that need airflow but no pests.
- Replacement screens and screen repair kits for windows and porches.
When sealing, think about movement and moisture. Use flexible caulks where surfaces expand. Cut excess expanding foam once cured, then cover with paintable caulk for a neat finish.
Step-by-step sealing plan
- Walk the exterior on a cool or windy day to spot leaks you might miss.
- Mark gaps with chalk or tape so you can find them again at night.
- Install door sweeps and replace torn screens first; these are quick wins.
- Caulk narrow cracks and use foam for larger cavities around pipes.
- Cover vents with fine mesh that still allows airflow.
- Recheck after rain and repeat tests to make sure the seals hold.
Small fixes often block the main routes spiders use. A door sweep alone can stop a surprising number of intruders.
Keep the indoors unattractive to spiders
Sealing stops new arrivals. Cleaning and lifestyle changes remove the reasons spiders stay.
- Vacuum regularly to remove webs, egg sacs, and food sources.
- Store items in sealed plastic bins instead of cardboard.
- Reduce clutter in basements, attics, and closets where spiders hide.
- Fix leaks and lower humidity to dissuade both spiders and their prey.
- Trim plants and mulch away from foundation walls to limit outdoor harborage.
Controlling the insects that spiders eat is as important as plugging gaps. Less prey equals fewer spiders.
Safety tips for handling spiders and egg sacs
Many spiders are harmless, but caution matters. Wear gloves and use a vacuum or long-handled broom to remove webs.
- Never squeeze spider egg sacs with bare hands.
- Bag and dispose of vacuum contents outdoors to prevent re-infestation.
- If you must move potted plants indoors, inspect them outdoors first and shake excess soil away.
When to involve a professional pest control service
Call an exterminator if spiders keep returning, if you find many egg sacs, or if venomous species appear. Professionals can identify species, treat problem zones, and offer long-term exclusion strategies.
Seek help immediately if you spot a brown recluse or black widow. These spiders pose a real bite risk and require trained handling.
