Exploring your backyard in Southern Ontario during the warmer months reveals a bustling world of pollinators. While they all share the goal of visiting flowers, their lifestyles and impacts on your home vary significantly. Here is a guide to the most common bees you’ll encounter in the region.
1. Eastern Bumble Bee (Bombus impatiens)
How to Identify Them
Bumble bees are the “teddy bears” of the bee world. They are large, robust, and covered in dense, fuzzy hair. They typically feature bright yellow and black bands. Unlike the shiny abdomen of a carpenter bee, a bumble bee is fuzzy from head to tail.
Lifecycle & Habits
These are social bees that live in colonies, though their hives are much smaller than honey bees (usually 50–400 bees). They typically nest in the ground, often repurposing old rodent burrows or nesting under thick grass and woodpiles.
Active Period
April to October. The queen emerges from hibernation in early spring to start the colony alone. By mid-summer, the worker population peaks.
Pest or Nuisance?
Rarely. They are incredibly docile and only sting if their nest is stepped on or directly threatened. Because they nest in the ground or away from structures, they aren’t a threat to your home.
2. Eastern Carpenter Bee (Xylocopa virginica)
How to Identify Them
Often mistaken for bumble bees due to their size, the giveaway is their shiny, hairless black abdomen. While their upper body (thorax) is fuzzy and yellow, their rear end looks like polished black plastic.
Lifecycle & Habits
Carpenter bees are solitary. Instead of a colony, a single female drills a perfectly circular, dime-sized hole into softwoods (like cedar, pine, or redwood) to create a tunnel where she lays her eggs.
Active Period
April to September. You will most often see the males in late spring hovering near eaves and decks—ironically, the males have no stinger and are harmless.
Pest or Nuisance?
Nuisance/Structural Pest. While they don’t eat wood, their tunneling can weaken structures over several years as they expand old nests. They also leave yellowish-brown waste stains on siding below their entry holes. Learn how to get rid of carpenter bees.
3. Western Honey Bee (Apis mellifera)
How to Identify Them
Honey bees are smaller than bumble bees (about 15mm) and have a more slender shape, though they are still hairy. They have distinct amber and brown stripes on their abdomen rather than bright neon yellow.
Lifecycle & Habits
Highly social, honey bees live in massive colonies of tens of thousands. In the wild, they nest in hollow trees or rock crevices. They are the only bees in Ontario that stay active inside their hive all winter, huddling together for warmth.
Active Period
March to November. They begin foraging as soon as temperatures hit about 10°C.
Pest or Nuisance?
Nuisance (Context Dependent). Generally, they are focused on flowers and ignore humans. However, if a colony moves into a wall void of your house, they can become a significant issue requiring specialized attention. Learn how to prevent and remove honey bees from your walls.
4. Sweat Bees (Halictidae Family)
How to Identify Them
These are tiny bees, often no larger than a grain of rice. Some species are a stunning metallic green or blue, while others are dark and unremarkable. They are often mistaken for small flies.
Lifecycle & Habits
Most are ground-nesters, digging tiny burrows in bare patches of soil or thin grass. They get their name because they are attracted to human perspiration and may land on skin to drink sweat.
Active Period
May to August. They love the high heat of mid-summer.
Pest or Nuisance?
Minor Nuisance. They are not aggressive, but because they land on skin, they can accidentally sting if brushed away or pinched. The sting is very mild compared to other species.
5. Leafcutter Bees (Megachilidae Family)
How to Identify Them
Roughly the size of a honey bee but with a broader head. They carry pollen on the underside of their abdomen (which often looks bright yellow or orange) rather than on their legs.
Lifecycle & Habits
Solitary cavity-nesters. They are famous for cutting neat, semi-circular sections out of leaves to line their nests. They don’t eat the leaves; they use them like wallpaper to protect their larvae.
Active Period
June to August. They are most active during the peak of the garden blooming season.
Pest or Nuisance?
Garden Nuisance. They don’t harm the health of the plant, but they can leave rose bushes looking a bit “Swiss-cheesed.” They are very gentle and almost never sting humans.