Why You’re Still Seeing Spiders in Your House This Fall

As the temperatures begin to drop in Colorado’s Front Range, spider sightings indoors tend to increase. Even if your home seems clean and well-sealed, it’s not uncommon to spot spiders hanging around baseboards, ceilings, and tucked away in quiet corners. Fall is a peak season for indoor spider activity, but understanding why can help you take effective steps to prevent them from overstaying their welcome.

Why Are Spiders Entering Homes in the Fall?

Contrary to popular belief, spiders aren’t invading your home just to spook you—they’re looking for survival. Fall is mating season for many spider species, and cooler weather pushes them indoors for warmth and shelter.

Here are the top reasons spiders show up in Denver homes during autumn:

• Temperature Drops: As nights get colder, spiders seek warm, stable environments.
• Mating Season: Many species become more active as they look for mates.
• Abundant Prey: Your home may be hosting other fall pests (like ants or flies), which spiders follow for easy meals.
• Undisturbed Spaces: Basements, attics, and storage rooms offer perfect hiding spots.

Common Spiders Found in Denver Homes

Some of the most frequently seen fall intruders in the Denver Metro Area include:

• Common House Spider – Found in corners and closets.
• Wolf Spider – Fast movers that prefer low-traffic areas.
• Yellow Sac Spider – Often spotted along ceilings or tucked in curtains.
• Black Widow – More dangerous, though less commonly seen inside.

Most spiders are harmless, but that doesn’t mean you want them as roommates.

How to Prevent Spiders From Moving In

Keeping spiders out requires a combination of cleaning, sealing, and monitoring. Here’s what works best:

• Seal Cracks and Gaps: Use weatherstripping on doors and windows, and caulk around plumbing and baseboards.
• Declutter Storage Areas: Spiders thrive in dark, undisturbed spaces filled with boxes or piles.
• Vacuum regularly: Especially in corners, under furniture, and around window sills.
• Eliminate Other Insects: Reducing other pests removes the spider’s food source.
• Install Door Sweeps: A small gap under your door is an easy entry point for crawling pests.

Why DIY Spider Control May Fall Short

Store-bought sprays and sticky traps can offer limited relief, but they don’t always address the root of the problem. Professional pest control includes:

• Thorough inspections to locate entry points and nests
• Targeted treatments that reach spiders hiding deep inside walls or crawlspaces
• Long-term prevention plans tailored to your home and local environment

FAQs About Fall Spider Problems

Why are spider sightings worse in the fall?
Cooler weather and mating season trigger spiders to become more active indoors.

Are most house spiders dangerous?
Most are harmless, but some, like the black widow, can pose health risks.

What areas should I check most for spiders?
Basements, garages, closets, and under furniture are common hiding spots.

Will cleaning alone get rid of spiders?
It helps, but a professional treatment is often needed to fully eliminate them.

How often should spider control be scheduled?
Fall is the best time to schedule an annual pest inspection, especially if you’ve noticed increased spider activity.

Schedule Trusted Spider Control Before the Problem Grows

Don’t let a few spiders turn into a full-blown infestation. Call Animal & Pest Control Specialist, Inc. today at 303-987-0842 for expert spider control tailored to Denver’s fall pest patterns. Our proven treatments, friendly technicians, and fast response times make it easy to protect your home before cooler temps drive even more pests inside. Book your fall inspection now—peace of mind is just one call away.