Fall Pest Prevention for Northwest Homeowners: What to Watch for Before Winter

Most homeowners don’t think much about pests until they spot one in the kitchen, hear scratching in the walls, or notice damage that suddenly seems impossible to ignore.

But by the time pests make themselves obvious, the problem may have been developing quietly for weeks — or even months.

Here in the Pacific Northwest, fall is an especially good time to pay attention. The rains are returning, temperatures are dropping, and winter weather is approaching. Just as we start spending more time indoors, rodents and other pests begin looking for warmer, drier places too.

A little prevention now can help avoid a much bigger problem later.

Fall Changes the Pest Picture

Pest problems aren’t limited to spring and summer. In fact, some of the issues Northwest homeowners deal with become more noticeable once cooler, wetter weather arrives.

Mice and rats are a major fall concern. As temperatures drop, they look for protected places to nest and can enter through surprisingly small openings around foundations, garages, crawl spaces, vents and utility penetrations.

Carpenter ants are another pest Northwest homeowners should take seriously. They don’t eat wood like termites do, but they can tunnel through it to create nests — particularly when moisture or damaged wood is present.

Our damp climate also makes moisture-related pests more of a concern. Dampwood termites, ants and other insects are often attracted to wet or decaying wood. A leaking pipe, poor drainage, damaged siding or moisture in a crawl space can create exactly the environment they like.

And then there are the larger visitors — squirrels and other small animals that may look for shelter in attics, garages or beneath decks as winter approaches.

Watch for the Early Warning Signs

The best time to deal with a pest problem is before it becomes an infestation.

You may notice clues long before actually seeing the pest itself. Watch for:

• Droppings in cabinets, garages or along walls

• Scratching or movement in walls, ceilings or attics

• Chewed wiring, insulation, boxes or stored belongings

• Small holes or gaps around siding and foundations

• Sawdust-like material near wood

• Unexplained wood damage

• Nests in garages, attics or crawl spaces

• Musty odors or signs of excessive moisture

Outside, pay particular attention to damaged weather stripping, gaps around pipes and utility lines, foundation cracks, clogged gutters, standing water and shrubs or tree branches touching the house.

With our fall rains, water management becomes especially important. Gutters that overflow, drainage that directs water toward the foundation, or a slow leak inside the house can do more than cause water damage — they can also make the property more inviting to pests.

I Learned This Lesson the Expensive Way

A Small Noise Turned Into a Bigger Problem

We had our own reminder of this last year.

For a while, we kept hearing something gnawing on the outside of the house where we live in Kenmore. At first, we couldn’t figure out exactly where it was coming from. Eventually, we found a small hole where a rodent — we’re still not sure whether it was a rat or a mouse — had actually chewed through the edge of one of the siding boards.

We blocked the opening, but by then it was too late.

Not long afterward, I noticed rodent droppings near the entrance to the crawl space. At that point, I knew we had more than just an exterior nuisance. We ended up bringing in a pest-control company to deal with the rodents and make sure the problem was actually taken care of.

What stood out to me was how small the original sign was. It was just an odd gnawing sound and a relatively small hole in the siding. But once the rodents had found a way in, the issue quickly became something that required professional help.

That experience reinforced an important lesson: when you hear or see something unusual around the house, don’t ignore it for too long. A strange noise, small opening, droppings, or damage around the exterior may be the first sign of a much bigger problem developing out of sight.

A Fall Walk-Around Is Worth the Time

Before winter really sets in, take 15 or 20 minutes and walk around your house.

Look at the foundation and siding for openings. Check the bottom of garage doors. Inspect weather stripping around exterior doors. Look around where plumbing, electrical lines, cable and other utilities enter the house.

Also look up. Tree branches touching the roof can provide easy access for animals, while leaves and debris accumulating in gutters can contribute to moisture problems.

Inside, take a quick look in areas we don't visit very often — the crawl space entrance, attic, garage corners, beneath sinks and around the water heater.

You aren't looking for perfection. You're simply looking for anything that seems different.

Make Your Home Less Inviting

A few basic steps can make a big difference:

Seal openings. Repair gaps around doors, windows, vents, pipes and foundations.

Control moisture. Repair plumbing leaks, keep gutters clear and make sure water drains away from the house.

Trim landscaping. Keep shrubs and branches from touching the siding or roof.

Store food carefully. This includes pet food and birdseed, which can be very attractive to rodents.

Reduce clutter. Cardboard boxes and rarely disturbed storage areas in garages and basements can make great nesting spots.

Pay attention to the garage. Garage doors are one of the easiest places for rodents to get inside, particularly when weather seals are damaged.

What About Professional Pest Inspections?

If you've had recurring pest problems, live near heavily wooded areas or notice something suspicious, having a pest-control professional take a look can be worthwhile.

They may spot entry points, moisture conditions or early evidence of activity that is easy for a homeowner to miss.

As with many home-maintenance problems, catching it early is usually much less expensive than dealing with the damage later.

Spending a few hundred dollars on prevention or addressing a small entry point is considerably easier than replacing insulation, repairing wiring, opening walls or replacing damaged wood.

One More Reason to Check an Empty Home

Pest problems can be particularly troublesome when a house is vacant for an extended period. There may be nobody there to hear the scratching, notice droppings in the garage or discover that something has gotten into the attic.

That's one of the things we watch for during our Homewatch visits. When we're checking a home for leaks, storm damage and other problems, we're also looking for anything unusual that could indicate pest or animal activity.

The Bottom Line

Fall in the Northwest means rain, falling leaves and cooler temperatures — and it's also the time when some unwanted visitors start looking for someplace warm and dry.

You don't need to become a pest-control expert. Simply knowing what to look for, keeping moisture under control and checking your home's exterior occasionally can go a long way.

A little attention this fall could save you from a much bigger — and more expensive — surprise this winter.