Fall Pest Prevention: Keep Rodents and Spiders Out of Your Calgary Home
As Calgary's temperatures start to drop in September and October, something else starts to move indoors — pests. Mice, rats, spiders, and cluster flies all seek warmth, food, and shelter as the weather cools. Fall is the single most important season for pest prevention, and a few simple steps now can save you from a full-blown infestation by winter.
Why Fall Is Peak Pest Season in Calgary
Calgary's fall brings rapid temperature swings — especially with our famous Chinooks. These warm winds confuse pests, triggering them to seek shelter earlier than in milder climates. By the time the first hard frost hits, rodents and spiders have already found their way inside.
The most common fall invaders in Calgary:
- Mice — Can squeeze through gaps as small as a dime
- Rats — Enter through foundation cracks and sewer lines
- Spiders — Follow insects indoors for food
- Cluster flies — Gather on south-facing walls before moving into attics
- Wasps & hornets — Aggressive in fall as colonies die off
7 Steps to Pest-Proof Your Home This Fall
1. Seal All Entry Points
Walk around your home's exterior and check for gaps, cracks, and holes. Pay special attention to:
- Where pipes and wires enter the house
- Around windows and doors
- Foundation cracks
- Vents and weep holes
Use steel wool, copper mesh, or silicone caulk to seal gaps. Mice can chew through foam and rubber, so use rodent-proof materials.
2. Install or Replace Door Sweeps
A gap under an exterior door is an open invitation for mice. Install door sweeps on all exterior doors, including the garage. If you can see daylight under the door, a pest can get in.
3. Clean Up the Yard
Pests love clutter. Before the snow flies:
- Move firewood at least 20 feet from the house and elevate it off the ground
- Clear leaf piles from around the foundation
- Trim back shrubs and branches that touch the house
- Store garbage bins away from the home with tight-fitting lids
4. Check Your Attic and Basement
These are the first places pests settle. Look for:
- Droppings (dark, rice-sized pellets = mice)
- Chewed wires or insulation
- Spider webs in corners
- Nests made of shredded paper or fabric
5. Eliminate Moisture Sources
Pests need water as much as food. Fix leaky taps, clear clogged gutters, and use a dehumidifier in damp basements. Spiders are especially drawn to humid areas.
6. Store Food Properly
Transfer pantry items to airtight glass or hard plastic containers. Rodents can chew through cardboard and soft plastic. Don't leave pet food out overnight.
7. Schedule a Fall Inspection
The most effective prevention is a professional inspection. A licensed technician can identify entry points you'd never notice and apply targeted treatments before pests become established.
Signs You Already Have a Problem
If you notice any of these, don't wait:
- Scratching or scurrying sounds in walls or ceilings, especially at night
- Droppings in kitchen drawers, pantries, or basements
- Greasy rub marks along baseboards (rats)
- Unusual pet behavior — dogs or cats staring at walls or cabinets
- Web clusters in corners or around windows
When to Call a Professional
DIY prevention is powerful, but once pests are inside, professional treatment is faster, safer, and more effective. At Calgary Pest Guard, our fall prevention service includes:
- Full exterior inspection and entry-point sealing
- Targeted rodent trapping and monitoring
- Spider and insect barrier treatment
- Guaranteed results or your money back
Don't wait until winter. Fall is the best time to act — before pests settle in for the season.
Ready to Protect Your Home?
Call (825) 760-5364 or book an appointment online for a free inspection. We serve Calgary, Airdrie, Cochrane, Chestermere, Okotoks, and all of Southern Alberta.
Calgary Pest Guard — Protecting your peace of mind, 100% guaranteed.