Fall Pest Prevention Checklist for DFW Homeowners

Seal rodent entry points before October. That's the single highest-impact thing you can do. Mice fit through any gap a quarter-inch or larger, so the inspection needs to be thorough. Walk your entire exterior and look for: gaps around utility lines where they penetrate the wall, open weep holes in brick veneer (fill with screens or copper mesh), worn weatherstripping on exterior doors, gaps between the garage door and the floor or side frames, and cracks where the foundation meets the sill plate.

Gaps should be sealed with appropriate materials — small gaps can be caulked with exterior-grade sealant, utility penetrations can be filled with copper mesh or steel wool before caulking (rodents cannot chew through these materials), and larger structural gaps may require sheet metal or hardware cloth before caulking.

Fall is an ideal time to address landscape features that harbor pests over the winter. Move firewood at least 20 feet from the structure and elevate it off the ground — wood piles against the house are a primary harborage and overwintering site for black widows, brown recluses, roaches, and rodents. Remove leaf piles and dense ground cover debris from against the foundation.

Trim back shrubs and tree branches that contact the exterior of the structure. These create highways for ants, roaches, and rodents to access the roofline and wall surfaces without touching the ground, bypassing perimeter treatments. A gap of at least 12 to 18 inches between vegetation and the exterior wall significantly reduces pest contact with the structure.

Inside the home, fall preparation focuses on eliminating conditions that make structures attractive to pests seeking shelter. Organize storage areas — particularly attic, garage, and closet storage — by replacing cardboard boxes with sealed plastic bins. Cardboard provides both nesting material and food for roaches and rodents, and loose cardboard stacks are a primary brown recluse harborage.

Repair any plumbing drips under sinks or in utility areas. Moisture is a primary attractant for cockroaches, ants, and rodents seeking water during drier fall and winter periods. Check that garbage containers inside the home are emptied regularly and that outdoor bins are covered and not overfilled.

Fall is a good time to schedule a professional perimeter treatment that prepares the exterior of the structure for winter. A fall application addresses overwintering insects at entry points, reinforces protection at a time when pest pressure is transitioning from summer to winter patterns, and allows the technician to identify any new conducive conditions that developed over the summer.

If you had any pest activity during the summer — ants, roaches, wasps, or evidence of rodents — fall is the time to address that with a professional rather than waiting to see if the issue resolves on its own. Winter rarely eliminates established pest populations; it suppresses them temporarily.

Stink bugs (brown marmorated stink bugs) invade DFW structures in fall seeking overwintering sites. They are not harmful but are a nuisance inside homes and emit an unpleasant odor when crushed. Sealing entry points is the primary prevention method, as chemical treatments for stink bugs are minimally effective.

Boxelder bugs, multicolored Asian lady beetles, and other overwintering aggregating insects also congregate on sun-exposed exterior walls in fall before seeking entry. Treating exterior surfaces with a residual insecticide before these aggregations form is more effective than trying to eliminate them once they are present.