Common Spiders in Maple Ridge: Are They Dangerous?

Spiders in the Fraser Valley: Separating Fact from Fear

Spiders are among the most misunderstood pests in British Columbia. In Maple Ridge — surrounded by forest, rivers, and green space — encounters with spiders are common, especially in late summer when males wander indoors looking for mates. But how many of these eight-legged visitors are actually dangerous?

The short answer: of the 900+ spider species in Canada and the roughly 80 species found in BC’s Lower Mainland, only two pose a medical concern — and deaths from spider bites in Canada are virtually unheard of. But that doesn’t mean you want them living in your bedroom or crawling across your kitchen counter.

Here’s a guide to the spiders you’re most likely to find in your Maple Ridge home, which ones to worry about, and what to do if you have an infestation.

The Two Spiders Worth Knowing About in BC

1. Western Black Widow (Latrodectus hesperus)

The black widow is BC’s only medically significant spider. Females are glossy black with a distinctive red hourglass marking on the underside of the abdomen. They’re about 8–10 mm long (not counting legs) and build messy, irregular cobwebs in dark, sheltered spots — woodpiles, sheds, garages, crawl spaces, and under outdoor furniture.

Are they in Maple Ridge? Yes, but they’re not common indoors. Black widows prefer dry, undisturbed outdoor areas. Bites are rare and occur when a spider is accidentally pressed against skin (e.g., putting on shoes or work gloves stored in a shed). A black widow bite causes localized pain, muscle cramps, and nausea but is rarely fatal — no one has died from a black widow bite in Canada in recorded history.

2. Hobo Spider (Eratigena agrestis)

There’s widespread confusion about the hobo spider in Canada. For years, it was classified as a dangerous species, but current medical research has largely debunked this. The CDC and poison control centres across North America no longer consider hobo spider bites medically significant. Tissue necrosis — once blamed on hobo spiders — is almost always caused by bacterial infection or other conditions misdiagnosed as spider bites.

What they look like: Brown with a herringbone pattern on the abdomen, about 7–14 mm long. They build funnel-shaped webs in basements, crawl spaces, and ground-level areas. They look very similar to the giant house spider (which is harmless) — even experts struggle to tell them apart without a microscope.

Harmless (But Annoying) Spiders in Maple Ridge

Giant House Spider (Eratigena atrica)

This is the spider most Maple Ridge homeowners call us about. It’s large — leg span up to 10 cm — fast-moving, and shows up in bathtubs, sinks, and on walls in late summer. It looks intimidating but is completely harmless. It’s also one of the fastest spiders in the world, covering up to 0.5 metres per second. Males wander indoors in August and September looking for mates, which is when most encounters happen.

Cellar Spider / Daddy Longlegs (Pholcidae)

Long, thin legs, small body — you’ll find these in basements, garages, and the corners of rooms. They build messy, loose webs and are one of the few spider species that will hunt and eat other spiders (including black widows if given the chance). Completely harmless to humans and actually beneficial to have around.

Cross Orb Weaver (Araneus diadematus)

Also called the European garden spider, this species builds classic spiral webs in gardens, between shrubs, and across doorways. They’re most visible in late summer when their webs grow large. Recognizable by the white cross pattern on their abdomen. Harmless and great for controlling garden pests.

Wolf Spiders (Lycosidae)

Wolf spiders don’t build webs — they hunt on the ground. They’re hairy, fast, and can be large (up to 3 cm body length). They often wander indoors from gardens and yards. Despite their fearsome appearance, they’re not aggressive and their bite is no worse than a bee sting.

Jumping Spiders (Salticidae)

Small, compact, and distinctive with their large forward-facing eyes — jumping spiders look like tiny fuzzy creatures and are actually quite curious. They stalk and pounce on prey rather than building webs. They’re common on sunny windowsills and walls and are completely harmless. Some species can even learn to recognize individual humans.

When Spiders Become a Problem

While individual spiders are beneficial (they eat flies, mosquitoes, and other pests), a large population is a sign of an underlying issue. Here’s when to act:

• Frequent sightings — if you’re seeing multiple spiders daily, you have an infestation
• Excessive webbing — heavy webs in corners, basements, crawl spaces, or around windows
• Black widows indoors — finding black widows inside, especially in living areas, warrants professional treatment
• Spider bites — while rare, bites indicate spiders are living in close proximity to your family
• Underlying pest problem — spiders are drawn to areas with prey insects. If you have flies, ants, or silverfish, you’ll have spiders

How to Prevent Spiders in Your Home

1. Seal cracks and gaps: Caulk around windows, doors, baseboards, pipes, and vents. Use door sweeps on exterior doors.
2. Reduce clutter: Spiders love cardboard boxes, stored papers, and cluttered basements. Store items in sealed plastic bins.
3. Remove outdoor harbourage: Move woodpiles, compost bins, and garden debris away from your foundation. Trim back shrubs touching your house.
4. Install insect screening: Ensure window screens, attic vents, and crawl space vents are in good repair.
5. Reduce lighting near doors: Outdoor lights attract insects, which attract spiders. Use yellow “bug bulbs” or motion-activated lights.
6. Regular cleaning: Vacuum corners, baseboards, under furniture, and behind appliances regularly to remove webs and egg sacs.

The Bottom Line on Spiders in Maple Ridge

The spiders you see in your Maple Ridge home are almost certainly harmless. The giant house spider running across your living room floor might give you a fright, but it’s not going to hurt you. Even black widows, while present in BC, are reclusive and rarely encountered indoors. If you’re seeing an unusually high number of spiders, treat the root cause — seal entry points, reduce moisture, and address insect prey — rather than reaching for a can of spray.

And if the sight of spiders is affecting your quality of life or you’ve confirmed black widows near living areas, a professional pest control service can provide targeted treatments and long-term prevention.

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Canadian Pest Control serves Maple Ridge, Pitt Meadows, Langley, Coquitlam, Port Coquitlam, Port Moody, Surrey, Burnaby, and the entire Fraser Valley. Locally owned, fully licensed, and insured since 2012.