August in Phoenix means summer is at its peak and monsoon storms are rolling through the Valley. For many homeowners, this month is about preparing for school and getting excited about football season, but taking care of the garage usually sits near the bottom of the attention list — somewhere between cleaning out the gutters and organizing the holiday storage bins.
At Nectar Pest Control, however, we consider August the ideal time to give your garage serious attention from a pest perspective, because the conditions that make fall a high-pressure pest season in Arizona are already developing, and the garage is almost always where pests get their first foothold inside a home.
Garages play a significant role in nearly every inspection Nectar Pest Control conducts in our Phoenix metro market. That’s because, as a rule, garages are warm, cluttered, and filled with the kinds of shelter and food sources that Arizona’s most common pests are actively seeking as temperatures begin to shift downward. Understanding why garages attract pests and what to do about it before fall arrives gives you a meaningful head start on one of the most predictable pest pressure points during the year.
Why Garages Are a Primary Entry Point for Fall Pests
The garage occupies a unique position in the structure of most Phoenix homes. Despite being attached to the living space, they are usually treated more like outdoor storage: doors are left open for extended periods, gaps and cracks that would never be tolerated in a bedroom or kitchen go unnoticed for months, and the neglected clutter that accumulates over time — boxes, bins, cabinets, and unused furnishings — creates shelter that pests can exploit without ever being detected.
As outdoor temperatures begin moderating in September and October, rodents that have been managing in the yard and surrounding landscape start looking for more sheltered quarters. Roof rats, which are well established across the Valley and particularly common in neighborhoods with mature citrus trees, use the roofline and eave areas directly above attached garages as travel routes into your home. Bark scorpions that have been active in block walls and desert landscaping through the summer begin moving toward structures as temperatures cool. Cockroaches that have been living in the landscape and drainage areas around the home follow moisture and warmth toward the same entry points.
The garage intercepts all of these pests before they reach the interior of the home, but only if it is maintained as a barrier rather than functioning as an open invitation. In most homes that experience pest intrusion from the garage into living areas, the garage itself has not been treated as a pest exclusion priority.
1. Start with the Garage Door
The garage door is the largest opening in most homes and one of the most neglected from a pest exclusion standpoint. The rubber seal along the bottom degrades over time from UV exposure and heat, and a seal that was effective when the door was installed may have gaps years later that are wide enough to admit scorpions, mice, and cockroaches. Close the garage door and look for daylight visible beneath it from inside; any gap that admits light admits pests. Replacement seals are inexpensive and straightforward to install.
The door between the garage and the interior living space is equally important. It should be treated with the same weatherstripping standards as any exterior entry door, with a functional door sweep along the bottom and intact weatherstripping around the frame. Many Phoenix homes have gaps under this door wide enough for a mouse to pass through, and a mouse that enters the garage has a direct path to the kitchen and living areas if that interior door is not sealed.
2. Eliminate Clutter and Harborage
Garage clutter is pest habitat. Cardboard boxes stacked against walls, bags of soil or mulch on the floor, loose holiday decoration bins, and piles of unused equipment all provide the dark, sheltered, undisturbed spaces that rodents, scorpions, and cockroaches actively seek. Roof rats in particular are strongly associated with cardboard storage; they shred it for nesting material and use stacked boxes as protected travel routes.
Replace cardboard boxes with hard-sided plastic bins with secure lids, and place all stored items at least six inches away from walls. Items that have been sitting on the garage floor undisturbed for an extended period should be inspected carefully before being moved; scorpions shelter under objects resting on concrete and are a common surprise when stored items are relocated.
Firewood stored in the garage deserves specific mention. Wood piles are documented habitat for bark scorpions, black widow spiders, and cockroaches. Store firewood outside and away from the structure, bringing it indoors only in the quantity needed for immediate use.
3. Seal Penetrations and Wall Gaps
Walk the interior perimeter of your garage and inspect every location where a pipe, wire, or conduit passes through the wall. Gaps around these penetrations can be sealed with expanding foam, copper mesh, or caulk depending on the size of the opening.
Pay particular attention to where the garage wall meets the foundation, and to the upper corners where the wall meets the ceiling framing — a common travel route for roof rats moving between the garage and the attic. Weep holes in exterior block walls are an intentional drainage feature but a documented scorpion entry point. Inexpensive mesh weep hole covers allow airflow and drainage while blocking pest access.
4. Address Food, Water, and Lighting
Pet food, bird seed, or any bagged food stored in the garage should be transferred to hard-sided, airtight containers. Open bags are among the most reliable rodent attractants in a Phoenix home, and even clipping them closed is insufficient, as rodents will readily chew through plastic or paper bags. Recycling bins containing unrinsed food containers sustain cockroach and ant activity; rinsing containers and using lidded bins reduces this significantly.
Check for water sources as well. Leaking water heaters, dripping utility sinks, and condensation beneath appliances stored in the garage all provide the moisture that cockroaches and silverfish need to sustain themselves near your home.
For lighting, switching exterior garage fixtures from standard bulbs to yellow or amber LEDs reduces the ultraviolet spectrum that attracts flying insects, as well as the scorpions that follow them toward the structure.
5. Check the Attic Access Point
Most Phoenix homes have attic access through a hatch or pull-down stair unit in the garage ceiling. A poorly sealed attic hatch with gaps around the frame allows roof rats that enter the garage to move directly into the attic, where they can damage insulation, wiring, and wall voids throughout the home. Inspect the hatch frame and seal any gaps with weatherstripping or foam. While you have it open, take a quick look into the attic with a flashlight — droppings, nesting material, or gnaw marks on joists are signals worth investigating and addressing before fall intensifies rodent pressure.
6. Schedule a Professional Perimeter Treatment Before Fall
Pest source reduction and exclusion measures mitigate the conditions that attract pests to the garage, but they do not address the problem if populations are already present in surrounding block walls, landscaping, and desert terrain that will be seeking shelter as temperatures shift. A professional perimeter treatment applied in August or early September, before the prime season when pests migrate toward structures, establishes a treated barrier that pests encounter before they reach the structure rather than after they have already found their way inside.
Let Nectar Pest Control Help You Get Your Garage Pest-Proof Before Fall
August is the right month to act. The pest pressure that arrives with Arizona’s fall season is predictable, and the garages that handle it best are the ones that were addressed before it arrives rather than after.
Nectar Pest Control serves homeowners throughout Phoenix, Mesa, Scottsdale, Chandler, Gilbert, and the surrounding Valley communities. Our inspections assess garage-specific vulnerabilities alongside the full exterior perimeter of your home, and our treatments are timed to establish protection before seasonal pest pressure peaks. Contact Nectar Pest Control today or go online to schedule an inspection that meets the highest standards of service. Fall is coming; it’s time to make your garage a fortress, not a welcome mat.