Do Spiders Come Inside When It Gets Cold in St. Louis?

Posted by Mosquito Squad Plus

October 2, 2026

Do Spiders Come Inside When It Gets Cold in St. Louis?

You might notice more spiders in the fall, but they don’t necessarily come inside just because it’s cold.

In fact, many common household spiders have been living inside your house all along, some becoming more visible when they venture out in search of mates. There’s a difference between seeing more spiders inside your home and actually having more spiders entering your home from outside.

Why Are You Seeing More Spiders This Fall?

When certain species of spiders reach maturity, males begin to wander in search of females. This heightened activity makes spiders more noticeable in basements, garages, bathrooms, and other areas inside your home.

Some outdoor spiders do enter buildings accidentally, but house spiders are adapted to indoor environments and might remain inside, no matter the season.

The point is, if you spotted a spider in your basement or laundry room, it doesn’t mean he just came inside. He could have been there for months already, just minding his own business until mating season drew him out.

Spotting Spiders Could Mean More

If you’re seeing more spiders, no matter inside or outside, it might mean you also have increased (or increasing in real time) autumn pest activity around your home. That’s because spiders are predators that feed on many types of insects and small anthropods. If your yard and the areas around your home’s exterior has a steady supply of spider prey, spiders will have all the reason they need to stay too.

One indicator is spider webs. If you’re seeing them pop up near basement windows, garage doors, storage spaces, or other obscure places where insects gather, it could be time to take action. Not just for spider control, but also for pest control to protect your home from bugs that spiders feast on.

Don’t go thinking that one spider sighting is indicative of an all-out pest invasion, but if you’re spotting them frequently, a closer look is worthwhile. Reducing pests around your home will be far less attractive to spiders who are looking for their next meal.

How Can You Reduce Spider Activity in and Around Your Home?

Don’t allow webs and egg sacs to remain, no matter when you find them. Remove them as soon as possible. You can vacuum hidden corners, clean behind stored belongings, and reduce clutter to overall reduce spiders’ hiding places.

Inspect your home’s exterior, including windows, doors, and gaps along the foundation, where spiders and other pests might try to enter.

Addressing insects gathering around your home can be an important step in controlling spiders too. Mosquito Squad Plus of Greater St. Louis offers year-round pest control solutions to keep spiders and their potential prey away from and out of your home.

And in the fall season, it’s time to consider our winterization pest control plan, custom tailored to treat pests that try seeking refuge close to or inside your home. This can include a pest control treatment to your home’s foundation plus our 90-day granular pest control powerhouse.

Winterization pest control means you’ll have a leg up on spring pest control, because fewer pests ahead of winter means fewer pests emerging next spring.

Where Do We Offer Pest Control in Greater St. Louis?

Mosquito Squad Plus is pleased to offer outdoor pest control services throughout the Greater St. Louis areas, including these towns and more.

Choose Mosquito Squad Plus for outdoor pest control in Greater St. Louis!

Call Mosquito Squad Plus of Greater St. Louis today for outdoor pest control near me. Get in touch with us by filling out our form online or calling us at for a free quote.

We additionally offer a 100% satisfaction guarantee. If you are not satisfied with your pest control treatment, call us within 21 days for a complimentary repeat treatment.