​If you think you’ve been seeing way more spiders than usual, you’re not imagining it. Colorado experiences a seasonal spike in spider activity in late summer, so it’s completely normal if you’re spotting more spiders than at other times of year.

But if spiders are showing up in your house, you may wonder when it’s just part of the seasonal spike, and when it’s something to be concerned about. Learn more below about why spiders are especially abundant in late summer, when you should worry about the ones in your home, and what you can do to get rid of them.

Late Summer Means Spider Mating Season

There’s a simple reason for the increase in spider sightings this time of year: it’s mating season! Many spider species in Denver and throughout Colorado mate in late summer and early fall. Male spiders begin actively seeking out females, and this increased movement makes them more visible.

It’s not that there are suddenly more spiders; it’s that they’re moving around more than they were a month ago. You might see more spiders indoors as males wander into homes during their search for a mate. You may also notice more webs in usual spots and new areas of your home.

Following the Food: Spiders Hunt Insects, and Insects Love Your Home

Mating isn’t the only reason spiders turn up in homes. Often, they come inside looking for food. Spiders feed on insects and follow their food source wherever it goes, including into your home.

If you’re dealing with an insect problem, spiders may move inside to take advantage of the easy meals. You may also notice more spiders around the exterior of your house if insects are being drawn to your porch lights at night. Spiders often spin their webs near windows and doors to catch those bugs, increasing their chances of slipping indoors.

Spiders Seek Shelter as Temperatures Drop

Late summer reminds us that fall is on the way. As temperatures cool around Boulder, Colorado Springs, and across the Front Range, spiders seek warm, protected shelter to lay eggs and ride out the winter.

They often settle in basements, garages, attics, crawl spaces, and other sheltered areas inside homes. This is another reason you might see a spike in spider activity this time of year.

Open Doors and Windows: An Invitation to Crawl Inside

August often brings beautiful, breezy weather in Colorado—perfect for letting in fresh air. But if you leave windows or doors open, spiders will take advantage. Even if you have screens, the most minor tear can provide just enough space for spiders to slip through and start making themselves at home.

Prevention Tips to Reduce Spider Activity

Because this is when spiders are most likely to come inside, it’s a great time to start taking steps to keep them out. By making your home less appealing to spiders, you can lower the chance they’ll move in. Here are some simple things you can do:

  • Eliminate their food source: Routine pest control reduces indoor insect populations
  • Declutter your home: Fewer hiding places mean fewer nesting areas
  • Seal entry points: Repair or replace torn screens, seal gaps around doors and windows, and caulk cracks in your foundation
  • Reduce outdoor attractants: Turn off porch lights or switch to yellow “bug lights” that attract fewer insects

When to Call EnviroPest

Even with prevention steps in place, it’s still possible for spiders to make their way inside. So, how do you know when it’s time to call EnviroPest? If you’re seeing spiders, unsightly webs, or are battling ants or other insects that spiders eat, reach out for assistance!

Eco-Friendly Spider Control That Works with Colorado’s Seasons

EnviroPest provides eco-friendly, comprehensive home pest control, designed for Colorado homes and the seasonal shifts that affect pest activity. While seeing more spider activity in late summer is normal, that doesn’t mean you have to share your home with them.

Our treatment plans eliminate active spiders and help keep them out through every season. Contact us today to request a quote and learn how we can help you take your space back.