Honey Bees in Ontario

Overview

Of all the bees an Ontario homeowner meets, the honey bee is the one you least want to kill. Apis mellifera is a managed pollinator — kept in hives by beekeepers, protected under Ontario’s Bees Act, and responsible for pollinating a large share of the province’s fruit and vegetable crops. Most encounters happen in one of two ways: a swarm, a temporary cluster of bees that lands in a tree or on a wall while scouting for a new home, or an established colony that has moved into a wall void, chimney, or soffit. The two situations call for completely different responses. A swarm is not an infestation and should be relocated by a beekeeper. A colony inside your structure is a genuine problem — but even then, the goal is careful removal, not a can of spray.

Identification

Honey bees are medium-sized — 12 to 15 mm — with an amber-to-golden brown body marked by darker bands, and a lightly fuzzy thorax. They’re noticeably smaller and slimmer than a bumble bee and far less glossy than a carpenter bee. They carry pollen in bright “baskets” on their hind legs, and unlike wasps, a honey bee can sting only once — its barbed stinger tears free, killing the bee, so it stings only in defence.

If you’re seeing aggressive insects around food, garbage, or a papery nest, you’re dealing with wasps, not honey bees — a critical distinction, because wasps aren’t protected and are treated very differently.

Life Cycle

A honey bee colony is a permanent, perennial superorganism: a single queen, tens of thousands of female workers, and seasonal males (drones). The queen lays up to 1,500 eggs a day in peak season, and eggs develop through larval and pupal stages into adult workers in about three weeks. Unlike Ontario’s bumble bees, a honey bee colony does not die each fall — it clusters together and overwinters on stored honey. When a colony grows too large in spring, it reproduces by swarming: the old queen leaves with about half the workers to found a new colony elsewhere, which is exactly the cluster homeowners find hanging from a branch in May and June.

Habitat & Behaviour

Wild and feral honey bee colonies nest in enclosed cavities — hollow trees, wall voids, chimneys, soffits, and unused equipment. They need a defensible entrance and a dry space large enough for comb. Around the home, foragers are a familiar sight on flowering plants, and they’re generally indifferent to people; a foraging honey bee has no interest in you. Defensive behaviour ramps up only close to an established nest. A swarm, by contrast, is at its calmest — with no brood or honey stores to protect, swarming bees are unusually docile.

Diet

Honey bees are strict vegetarians, feeding entirely on nectar and pollen from flowers. They convert nectar into honey to store as winter food, and pollen provides the protein that feeds developing larvae. This is why honey bees are never found scavenging at your picnic or garbage — a scavenging “bee” is almost always a wasp.

Signs of Infestation

• Steady two-way bee traffic in and out of a single gap in siding, brick, soffit, or a chimney — the clearest sign of an established interior colony.
• A cluster or “beard” of bees hanging from a branch, fence, or eave — this is a swarm, usually temporary.
• Honey or dark staining bleeding through interior drywall or ceilings, indicating comb behind the surface.
• A faint, sweet smell of honey or wax near an interior wall on warm days.
• A low, constant hum audible through the wall near the entrance point.

Damage Caused

Honey bees don’t chew or bore wood — the damage is entirely secondary and comes from the nest they build. An established colony can store 15 kg or more of honey inside a wall by late spring. If the bees are killed and the comb abandoned, that honey ferments, seeps through drywall, and stains ceilings and walls, while the wax and dead brood rot in place. Worse, the abandoned larder becomes a magnet for ants, cockroaches, wax moths, carpet beetles, mice, and even skunks. This is precisely why simply spraying a wall colony is the wrong move: it converts a bee problem into a rot-and-secondary-pest problem.

Health Risks

For most people, honey bees are low-risk — they sting only defensively, and a foraging bee in the garden poses essentially no threat. The exception is anyone with a bee-venom allergy, for whom any sting can be a medical emergency; an active nest near a doorway, deck, or child’s play area warrants prompt professional attention. Disturbing an established colony can provoke many defensive stings at once, so never poke, spray, or seal the entrance of an active wall colony yourself.

Seasonal Activity in Ontario

Honey bees are active from the first warm days of April through October. Swarm season peaks May through July, when strong colonies split — this is when most homeowners across the GTA, Hamilton, and the Barrie area encounter a swarm. Through summer, foragers are visible on flowers everywhere. As temperatures drop in autumn, the colony contracts and stops flying, clustering inside its cavity to overwinter on honey. A colony discovered inside a wall in winter is dormant but very much alive, and will resume activity in spring.

Where They Hide

Established colonies favour dark, enclosed cavities: wall voids (especially where insulation is thin), masonry chimneys, soffits and eaves, attic corners, and hollow porch columns. Outdoors, feral colonies use hollow trees and occasionally abandoned equipment or compost bins. Swarms rest temporarily in the open — on tree branches, fence rails, patio furniture, or the side of a house — while scout bees search nearby cavities for a permanent home.

How They Enter Homes

A colony gets in through a single small opening: a gap in siding or brick, an unscreened vent or weep hole, a chimney flue, or a soffit joint. Scout bees from a swarm investigate these openings, and if the cavity behind is suitable, the whole swarm moves in within hours. Once inside, the bees enlarge nothing — they simply build comb in the existing void — which is why sealing likely entry points before swarm season is the most effective prevention.

Prevention Tips

1. Before swarm season (by early May), inspect and seal gaps in siding, fascia, and soffits, and around utility penetrations.
2. Screen attic vents, gable vents, and weep holes with fine mesh bees can’t pass.
3. Cap unused chimneys and flues.
4. Fill hollow porch columns and seal knotholes or gaps in exterior trim.
5. If a swarm lands on your property, leave it alone — most depart within a day or two — and keep pets and children back.
6. Call a beekeeper promptly if a swarm shows signs of investigating a cavity in your home.
7. Never plug an active colony’s entrance — trapped bees chew toward light and end up inside living space.

DIY vs. Professional Treatment

There’s no safe or legal DIY answer for honey bees. A swarm should go to a beekeeper for relocation — it’s a protected pollinator and, on an accessible branch, is usually rescued at little cost. For an established colony inside a wall or chimney, the job requires opening the cavity, removing every bit of comb and honey, extracting the bees, and sealing the structure — well beyond a homeowner spray, and botched attempts leave rotting comb and secondary pests behind. Ontario’s cosmetic pesticide rules also limit what you can legally apply. Sani IQ’s approach is honest: for a swarm we point you to a beekeeper, and for a true structural colony that can’t be relocated we handle removal and cleanup properly, backed by our Pest-Free-Or-It’s-Free guarantee. Start with our contact page if you’re unsure which situation you have.

References

• Ontario Beekeepers’ Association — Found a Swarm of Honey Bees?
• NC State Extension — Removing Honey Bees From Structures
• Government of Ontario — Using Pesticides in Ontario

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