Fall Pests to Watch For

Abell Pest Control mouse

As temperatures cool, many pests and wildlife species begin searching for sheltered places to spend the winter. Fall is an important time to identify and address conditions that may allow pests to enter or establish themselves around your property. Here are some of the most common pest concerns to watch for this season.

 

Wasps and Yellowjackets

Late summer and early fall are when yellowjacket colonies reach their largest size. As natural food sources become less available, these stinging insects are attracted to sugary foods, beverages, garbage, and recycling areas.

Most yellowjackets nest underground, often in abandoned rodent burrows, beneath landscaping features, or near building foundations. Nests may go unnoticed until routine outdoor activities disturb them.

 

To help reduce activity around your property:

  • Keep garbage and recycling containers closed.
  • Remove fallen fruit and food debris from outdoor areas.
  • Cover food and beverages when eating outside.
  • Inspect high-traffic areas regularly for signs of nest activity.

 

If you discover a nest, avoid disturbing it and contact a pest management professional. While colonies typically die off after the first hard frost, active nests can remain a concern throughout the fall.

 

Rodents

As outdoor temperatures decline, mice and rats begin looking for warm, protected places to nest. Buildings provide ideal shelter, particularly when food, water, and entry points are readily available.

Rodents can enter through surprisingly small openings, making exclusion one of the most effective prevention measures.

 

Consider the following steps:

  • Seal cracks and gaps around foundations, doors, windows, and utility penetrations.
  • Install or maintain weatherstripping on exterior doors.
  • Remove leaf piles, vegetation, and clutter near the building.
  • Store firewood away from exterior walls and off the ground.
  • Keep waste containers closed and well maintained.
  • Store food products, including pet food, in sealed containers.

Early detection is important. Signs such as droppings, gnaw marks, scratching noises, or rub marks may indicate rodent activity and should be investigated promptly.

 

Boxelder Bugs and Other Overwintering Insects

Boxelder bugs, stink bugs, and Asian lady beetles are among the insects that seek shelter indoors as temperatures cool. These pests often gather on sunny exterior walls before moving into cracks, gaps, and voids around a building.

While they do not cause structural damage, large numbers can become a nuisance indoors, particularly during warmer days throughout the winter.

 

The most effective approach is prevention:

  • Seal cracks and gaps around windows, doors, siding, and utility openings.
  • Repair damaged screens and weatherstripping.
  • Inspect exterior walls and rooflines for potential entry points.

If insects do enter a building, vacuuming is generally recommended over crushing them, which can create stains or odours.

 

Wildlife Activity

Fall is also a common time for wildlife such as squirrels, raccoons, and bats to seek shelter in attics, wall voids, and other protected spaces.

Wildlife can damage building materials, contaminate insulation, and create ongoing maintenance issues if access points are not addressed.

 

To help prevent wildlife entry:

  • Install chimney caps where appropriate.
  • Cover roof, attic, and soffit vents with durable screening.
  • Repair damaged soffits, fascia, and roof edges.
  • Trim tree branches that provide access to the roof.
  • Keep waste and compost containers secured.

If wildlife activity is suspected, avoid handling animals or attempting removal yourself. Professional inspection and exclusion measures can help ensure animals are removed safely and entry points are properly addressed.

 

A Proactive Approach to Fall Pest Prevention

Many fall pest problems begin with small entry points, available food sources, or sheltered hiding areas around a property. Regular inspections, good housekeeping practices, and prompt maintenance can help reduce the likelihood of pests and wildlife becoming established as the weather changes.

By addressing these conditions early, you can help protect your property throughout the fall and winter months.


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Fall Pests to Watch For
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