Why Fall Means Trouble for Your Home
As cooler air and shorter days settle across the Pacific Northwest, pests start searching for warmth and shelter. Fall is one of the most active pest seasons in Washington because insects and rodents begin migrating indoors. Even small cracks around doors, vents, and foundations can invite unwanted guests into your home.
Many homes in the PNW—especially those surrounded by trees or older neighborhoods—are at higher risk during this seasonal change. Understanding which pests are most active right now can help you stop an infestation before it starts.
Key Fall Pests in the Pacific Northwest
1. Rodents (Mice & Rats)
Rodents are the top fall intruders in Washington. As nights grow colder, mice and rats squeeze through openings as small as a dime to find food and warmth. Once inside, they can chew wires, nest in insulation, and contaminate food storage areas.
Prevention Tips:
- Seal foundation cracks and utility gaps with steel wool and caulk.
- Keep firewood at least 20 feet from the house.
- Store pet and pantry foods in sealed containers.
2. Spiders
Fall is spider mating season, so homeowners often notice more activity indoors. Most PNW spiders, such as the common house spider and giant house spider, are harmless—but no one wants cobwebs in the corners.
Prevention Tips:
- Vacuum and dust regularly to remove webs and egg sacs.
- Seal gaps around windows and foundation vents.
- Reduce clutter in garages and basements.
3. Boxelder Bugs & Stink Bugs
When temperatures drop, boxelder bugs and stink bugs look for a cozy place to overwinter—often behind siding, in attics, or window frames. While harmless, they can stain fabrics and walls if crushed, and their odor can be unpleasant.
Prevention Tips:
- Seal gaps around windows, siding, and light fixtures.
- Vacuum up any bugs found indoors instead of crushing them.
- Store firewood away from the house exterior.
4. Ants
Carpenter ants and moisture ants are active year-round but become more noticeable in fall as they seek warmth. Carpenter ants can damage structural wood if left untreated.
Prevention Tips:
- Fix plumbing or roof leaks promptly.
- Remove decaying wood around decks or basements.
- Keep kitchen counters and floors free of crumbs.
5. Moisture-Loving Insects (Earwigs, Silverfish, etc.)
These pests thrive in damp, dark areas like basements, bathrooms, and crawlspaces. Fall moisture attracts them indoors as outdoor habitats cool and dry.
Prevention Tips:
- Use a dehumidifier in damp spaces.
- Seal gaps around plumbing.
- Store cardboard boxes off the floor.
How to Prevent Fall Pest Intrusions
Seal Entry Points
Inspect your home exterior for cracks, gaps, and holes. Pay special attention to areas around pipes, vents, and foundation lines. Use steel mesh or silicone caulk to close openings.
Control Moisture
Repair leaky gutters and downspouts, and make sure water drains away from the foundation. Keep mulch, leaves, and compost at least 12 inches from siding.
Maintain Clean Interiors
Vacuum regularly, store food properly, and empty trash frequently. These small steps remove attractants that bring pests indoors.
Monitor and Act Quickly
Watch for droppings, gnaw marks, or strange noises in walls and attics. Early detection makes treatment faster and easier.
When to Call Pest Control Northwest
If you see repeated signs of pests—or suspect rodents in the attic or crawlspace—it’s best to call in professionals. Pest Control Northwest specializes in identifying entry points, sealing structures, and providing safe, targeted treatments.
We serve homeowners across Washington with environmentally conscious pest solutions that keep families, pets, and properties protected.
Stay Protected This Fall
The Pacific Northwest’s mild climate makes it a haven for pests preparing for winter. By sealing, cleaning, and monitoring now, you can avoid the headaches of a full-blown infestation.
When prevention isn’t enough, let Pest Control Northwest help you regain peace of mind.
Contact us today to schedule your fall inspection or service.
