If it feels like you’re suddenly seeing more spiders around the house, you’re not imagining it. Fall is peak spider season in Alberta – it’s mating season for many species, and cooler weather nudges them toward the warmth indoors. Before you reach for a rolled-up newspaper, it helps to know who the different types of spiders in Alberta. Most are harmless, a few are helpful, and only one is worth genuine caution.
Why You See More Spiders in the Fall
Spiders are around all year, but autumn is when they become impossible to ignore. Males of many species go wandering in search of mates, which is why you spot them crossing the floor or lurking in a corner. At the same time, dropping temperatures draw them toward the stable warmth of our homes – garages, basements, window frames, and quiet corners all become prime real estate.
The Common Types of Spiders in Alberta
- Common house spider – The classic indoor spider: small, brownish, and the one behind most of the tangled webs in ceiling corners and window frames. Harmless, and more interested in catching flies than bothering you.
- Cellar spiders (daddy long-legs) – Long, delicate legs and a small body, usually found in basements, garages, and other damp, undisturbed spots. These types of spiders in Alberta are completely harmless, and they’ll even prey on other spiders.
- Wolf spiders – Larger, fast-moving, and hairy, wolf spiders don’t build webs, they hunt on the ground, which is why one darting across the floor can be startling. Intimidating to look at, but not aggressive and not dangerous to people.
- Orb weavers (garden spiders) – The architects behind the beautiful wheel-shaped webs you see across gardens and doorways in fall. They’re outdoor spiders doing you a favour by eating pests, and are harmless to humans.
- Jumping spiders – Small, compact, and often surprisingly bold, with excellent eyesight. Harmless and, for many people, oddly endearing once you get past the jumping part.
Are Alberta’s Spiders Dangerous?
For the vast majority, no – the types of spiders in Alberta you’ll meet in and around homes are harmless and actually beneficial, quietly keeping other insect populations in check. The one exception worth knowing is the western black widow, which does live in Alberta but is rare and generally confined to dry, undisturbed areas of the far south of the province, not typical Calgary homes. It’s shy and not aggressive, but its bite is medically significant, so it’s the one spider to treat with caution if you ever do come across one.
Tips for Keeping Spiders Out
With that said, “harmless” doesn’t mean “welcome in the basement,” so here’s how to keep their numbers down without turning your house into a chemical warfare zone.
- Cut off the buffet – Spiders go where the food is, and their food is other bugs. If you’ve got a spider problem, you usually have an insect problem first. Reduce flies, moths, and other prey, and the spiders lose their reason to stick around. Swapping outdoor white bulbs for yellow “bug light” LEDs is a small change that pulls fewer insects toward your doors and windows at night.
- Seal the entry points – The types of spiders in Alberta are smaller and can slip in through gaps you’d never think twice about, including worn weatherstripping, cracks around window frames, gaps where cables and pipes enter the house. Walk your foundation and exterior once a season, caulk the small stuff, and add door sweeps where you can see daylight underneath.
- Take away the hiding spots – Spiders love clutter, dark corners, and undisturbed spaces. Keep storage areas tidy, store boxes off the floor and sealed (bins beat cardboard), and clear away leaf litter, woodpiles, and debris pushed up against the exterior walls. The less shelter outside, the less pressure to move inside.
- Make cleaning your first line of defense – Regular vacuuming corners, ceilings, under furniture, and window sills removes spiders, egg sacs, and the webs that signal a comfortable home. Knock down webs as you find them; a spot that keeps getting re-webbed is telling you where to focus.
- Manage the perimeter, not just the interior – Spiders typically set up shop outside first. Keeping vegetation trimmed back from the siding and reducing moisture around the foundation makes the exterior far less inviting, which means fewer making the trip indoors.
When to Consider Spider Control
A spider or two is just part of living in Alberta. But there are times it’s worth calling in help:
- You’re seeing spiders constantly, or webs keep reappearing no matter how often you clear them.
- You’re finding egg sacs, which signal a population that’s about to multiply.
- The volume is affecting how you use your home, or someone in the household has a real phobia.
- You want peace of mind that there’s nothing more concerning hiding in the mix.
Seeing a few too many eight-legged houseguests this fall? Get in touch with our team for safe and quick spider control.