If you are suddenly noticing more spiders and bugs indoors, you are seeing one of the most predictable events of the season: fall pests in Edmonton making their way inside as the weather cools. As the first chilly nights arrive, cluster flies and boxelder bugs move in to overwinter, and spiders become far more noticeable as they hunt and roam. Here is why it happens, which invaders to expect, and how to keep them out before they settle in for the season, with help from our team for pest control in Edmonton when you need it.
Why pests come indoors in fall in Edmonton
Most fall invaders are not trying to live in your home so much as survive the winter in it. As daytime temperatures drop and the first frosts hit, overwintering insects instinctively search for warmth and shelter, and a heated house is exactly what they are drawn to. Spiders come along for a different reason, following those insects indoors and hunting where the food is. Our Edmonton freeze and thaw cycles make it easier for all of them, slowly opening cracks and gaps around foundations, windows, and siding. Sunny south and west facing walls warm up in the afternoon and become gathering spots, and from there it is a short trip through a gap into your living space.
The most common fall invaders in Edmonton homes
Spiders
Fall is when most people notice spiders indoors, but not because they are moving in from outside to overwinter. Most Edmonton house spiders live indoors year round. What changes in the fall is that males roam in search of mates, and spiders follow the other insects that are coming inside, so you simply see them more. The vast majority are harmless and actually help control other pests, but few people want them sharing the living room, and a jump in spiders is often a sign that other insects are getting in too.
Cluster flies
Cluster flies are a classic fall nuisance. On warm autumn afternoons they gather in large numbers on sunny walls, then work their way into attics, wall voids, and around windows to overwinter. They are slow and sluggish, they do not bite or breed indoors, and they are harmless, but waking up to dozens of them on a sunny windowsill in fall or on the first warm day of spring is enough to send most people looking for help.
Boxelder bugs
These black bugs with red or orange markings congregate on the warm sides of homes in fall and slip inside to overwinter in cracks and voids. They do not bite or damage your home, but in large numbers they are a real nuisance, and if crushed they can leave a stain.
Lady beetles
You may also spot the occasional orange lady beetle, often the Asian lady beetle, gathering on sunny walls and slipping inside to overwinter. They are a far less common home invader in Edmonton than cluster flies or boxelder bugs, but they are worth knowing, since unlike native ladybugs they can give a mild nip and leave a yellow stain if disturbed.
How to keep fall invaders out
The single best defence against every pest on this list is the same: seal the openings before the cold drives them in. Work through this checklist in early fall while the weather still cooperates:
- Seal cracks and gaps around the foundation, siding, window and door frames, and where utility lines enter, using caulk or proper exclusion materials.
- Screen and cover openings such as vents, weep holes, and attic and soffit gaps with fine mesh.
- Add door sweeps and weatherstripping to exterior doors and the garage.
- Reduce moisture and clutter in basements, garages, and storage areas, since damp, cluttered spaces attract both insects and the spiders that follow them.
- Clear webs and vegetation from around entry points, and trim shrubs and plants back from the walls.
- Adjust exterior lighting where you can, since bright lights near doors draw in the insects that spiders feed on.
Do not forget the mice
Insects are not the only ones heading indoors as it cools. Fall is also when mice start looking for a warm place to winter, and the same gaps that let bugs in let mice in too. If you are sealing up this season, it is worth reading our guide on how to keep mice out of your Edmonton home this fall at the same time.
When to call a professional
Sealing helps, but by the time invaders are gathering on the walls in large numbers, the most effective fix is a professional exterior perimeter treatment applied in early fall, before they make their way inside. This creates a barrier around the home that stops fall pests at the door, and it is far easier than chasing them once they are indoors. Our Edmonton team treats the entry points and harbourage areas with family safe methods, and for homeowners who would rather not think about it each season, our Home Shield program keeps common invaders out year round. If insects are only part of the picture, we also handle the full range of insect control in Edmonton.
What it costs
Home Shield year round protection starting at $80 per month
One time fall perimeter treatments are quoted based on your home and situation. We provide a free quote before any work begins.
Frequently Asked Questions
Why are there so many spiders in my house in the fall?
Two things happen at once. Male spiders roam in search of mates in late summer and fall, and spiders also follow the other insects that are moving indoors for warmth. More insects getting in means more spiders getting in after them, which is why sealing out the whole group works better than chasing spiders alone.
Are cluster flies or boxelder bugs harmful?
No. Cluster flies, boxelder bugs, and lady beetles do not bite in any serious way, do not damage your home, and do not breed indoors. They are overwintering guests rather than a true infestation. The problem is the numbers, since dozens or hundreds gathering on windows and walls is a genuine nuisance.
When is the best time for a fall perimeter treatment?
Early fall, before the first hard frosts push pests indoors, is the ideal window. Treating the exterior while insects are still gathering outside stops them at the entry points rather than after they have already found their way in.
How do I stop lady beetles and bugs from coming back every year?
The same spots tend to attract overwintering pests season after season, so the lasting fix is sealing those entry points and keeping a treated barrier around the home. A year round plan handles the seasonal cycle for you so you are not starting over each fall.
Do you do spider control in Edmonton, and what does it cost?
Yes. Spiders are one of the most common reasons Edmonton homeowners call us in September and October. A fall perimeter treatment covers the foundation, window and door frames, soffits and the usual entry points, which knocks down the spiders that are already there and, more importantly, the insects they are following indoors. Spiders and the other fall invaders are covered under Home Shield year-round protection, which starts at $80 per month and includes scheduled seasonal visits, so you are not starting over every autumn. If you would rather book a one-time fall treatment, call (780) 306-7704 for a free quote.
A Family Owned Team, Ready Before the Cold
All About Pests was built right here in Edmonton by Kevin and Brooke, and we know that keeping the bugs outside where they belong is really about a comfortable, worry free home for the people inside it. Get your fall barrier in place before the invaders do.
Noticing more bugs indoors already? Get a free quote today.
