Are jumping spiders dangerous to humans?

No. Jumping spiders are among the most harmless spiders you can meet. They're tiny, shy, and far more likely to watch you or hop away than bite. A bite only happens if one is squeezed against skin, and it's minor — comparable to a pinprick with brief irritation. They carry no medically significant venom and pose no real risk to people or pets.

Why is this little spider watching me and hopping around?

That's a jumping spider, and the watching is real. Salticids have the best vision of any spider — two large forward-facing eyes give them sharp, colour-capable sight. They turn to track movement and often 'look at' people out of curiosity. The hopping is how they hunt and travel: they stalk prey, then pounce, sometimes several times their body length.

Do jumping spiders build webs in my house?

No snare webs. Jumping spiders don't spin traps — they hunt by stalking and pouncing on prey in the open, usually on sunny walls, sills, and fences. They do produce silk as a safety dragline when they jump, and they spin small silk retreats to rest in at night and moult. So you'll see them roaming, not sitting in a web waiting.

How do I tell a jumping spider from other house spiders?

Behaviour and build. Jumping spiders are small and compact with a short, fuzzy body, two prominent forward-facing eyes, and a habit of turning to face you and hopping in short bursts. House and cellar spiders sit in webs; wolf spiders run flat and fast along the ground. If a small spider is hopping around a sunny window and seems to watch you, it's a jumper.

What is the black spider with white spots on my wall?

Most likely the bold jumping spider (Phidippus audax), one of Ontario's common jumpers — black and fuzzy with white or orange spots on the abdomen and often iridescent green or blue mouthparts. The small black-and-white striped spider darting around window frames is usually the zebra jumping spider (Salticus scenicus). Both are harmless.

Should I get rid of jumping spiders?

There's little reason to. Jumping spiders are solitary, don't infest homes, build no messy webs, and actively hunt other insects including pests. A single jumper on a wall can simply be carried outside. Control only makes sense as part of a broader spider or insect program when overall spider numbers around the home are high.

Jumping Spiders in Ontario: Identification Guide

Overview

Jumping spiders (family Salticidae) are the small, curious, sharp-eyed spiders you find on sunny walls, windowsills, fences, and decks — the ones that turn to look at you and hop away in quick bursts. They’re the largest spider family in the world and among the most harmless creatures an Ontario homeowner will encounter indoors. Rather than spin a web and wait like a house spider, jumping spiders hunt in the open on bright days, stalking prey and pouncing with startling accuracy. Many people who are wary of spiders find jumpers oddly charming once they know what they are: alert, expressive, and utterly uninterested in humans except as something to watch.

Identification

Jumping spiders are 4–15 mm in body length — small and compact — with a short, often fuzzy body and relatively short legs. The unmistakable feature is the eyes: four pairs, with two very large forward-facing eyes that give them the sharpest vision of any spider, capable of colour and fine detail. They move in a distinctive stop-start way and turn their whole body to track movement. Ontario’s most common species include the black-and-white striped zebra jumping spider (Salticus scenicus) on walls and window frames, and the bold jumping spider (Phidippus audax), black and fuzzy with white or orange abdominal spots and iridescent mouthparts.

The look-alike to rule out is the wolf spider, another web-less hunter — but a jumper is far smaller and hops rather than runs.

Feature	Jumping Spider	Wolf Spider
Body size	Small, 4–15 mm	Large, 10–35 mm
Body shape	Short, compact, fuzzy	Elongated, robust
Eyes	Two big front eyes, faces you	Eyeshine, forward row lower
Movement	Stop-start, hops	Runs flat and fast
Where	Sunny walls, sills, decks	Ground level, floors

Life Cycle

Females lay eggs in a silk retreat — often tucked under bark, siding, or a windowsill — and guard the sac until the spiderlings emerge. Young jumpers disperse and mature over a season, and adults are most visible spring through fall. Courtship is elaborate: males perform visual displays, waving legs and vibrating, relying on the family’s exceptional eyesight. Most complete their life cycle within a year.

Habitat & Behaviour

Jumping spiders are diurnal — they hunt in daylight, favouring warm, sunny surfaces where prey is active and their vision works best. Outdoors they patrol siding, fences, tree trunks, garden foliage, and rock faces; indoors they turn up on sunlit walls, windows, and sills. They don’t build snare webs, but they trail a silk dragline as a safety line when they leap, and they spin small silk shelters to rest in overnight and during moulting. They are solitary and non-territorial toward people.

Diet

Jumping spiders are active predators of small insects — flies, gnats, mosquitoes, aphids, and other spiders — which they stalk and ambush rather than trap. In humid summer months when insect prey moves indoors, a sunny window can become a productive hunting ground. Their pounce, often several times their body length, is guided entirely by their acute eyesight. In and around a home they’re a genuinely beneficial presence, thinning nuisance insect populations.

Signs of Infestation

There’s rarely anything to call an infestation. Jumping spiders are solitary wanderers, so “signs” are simply occasional sightings:

Small spiders on sunny walls, windowsills, and decks during the day, moving in short hops.
A spider that turns to face you and tracks your movement — near-diagnostic of a salticid.
Tiny silk retreats tucked in window corners, under siding, or behind trim, used for resting and moulting.

Damage Caused

None whatsoever. Jumping spiders build no messy webs, cause no structural or material damage, and don’t infest food or fabric. They are among the lowest-impact arthropods that share a home.

Health Risks

Negligible. Jumping spiders are extremely shy and bite only if physically squeezed against skin. A bite is minor — a brief pinprick sensation with mild, short-lived irritation — and carries no medically significant venom. They pose no meaningful risk to adults, children, or pets, and are not aggressive under any normal circumstances.

Seasonal Activity in Ontario

Jumping spiders are active from spring through fall, most visible on warm, sunny days when they hunt on heated surfaces. Activity peaks in summer and tapers as temperatures drop; they overwinter as juveniles or adults in silk retreats under bark, siding, and in sheltered crevices. Because they favour sunlit surfaces, urban homes with warm south-facing walls in Toronto, Etobicoke, and Hamilton see them regularly through the warm months.

Where They Hide

Their silk retreats sit in protected, warm spots: under exterior siding and trim, behind shutters, in window frame corners, under bark and stones outdoors, and in sheltered crevices around decks and fences. Indoors, they rest in retreats tucked into window corners and along sunny walls, emerging to hunt in daylight.

How They Enter Homes

Jumping spiders wander in individually through open windows and doors, gaps around window frames, and small exterior openings, often following the sunlit surfaces and insect prey that draw them. They also ride in on plants and outdoor items. They don’t seek out interiors the way overwintering pests do — an indoor jumper is usually a solo explorer that came in after prey.

Prevention Tips

Carry solo spiders outside with a cup and card — there’s no need to kill a beneficial jumper.
Seal gaps around window frames, doors, and vents to reduce casual entry.
Switch exterior bulbs to warm/yellow LED to draw fewer insects to walls where jumpers hunt.
Reduce insect prey around the home — fewer flies and gnats means fewer hunting spiders of every kind.
Keep window screens intact to block the easiest entry route.
Trim foliage touching sunny exterior walls that acts as a bridge indoors.

DIY vs. Professional Treatment

Jumping spiders almost never warrant treatment on their own — a single wanderer is best simply carried outside, and they build nothing to remove. They become relevant only as part of a bigger picture: if overall spider activity around the home is high, a jumping-spider sighting is one symptom among many, and the fix is the same broad approach that handles the web-building house and orb-weaver spiders — reducing insect prey and treating harbourage. Sani IQ’s general spider control program covers spiders as a group and is backed by a Pest-Free-Or-It’s-Free guarantee; see plans and pricing if spider numbers overall have crossed your threshold, or the 2026 cost guide for a breakdown.

References

Last updated: July 16, 2026 · Reviewed by Sani IQ licensed technicians

Jumping Spiders in Ontario