STINGING INSECT GUIDE

Bumble bee

Identification, local timing in San Antonio and the Hill Country, risk profile, and exactly how we treat it.

Scientific names: Bombus pensylvanicus (American bumble bee), B. impatiens (common eastern bumble bee), B. griseocollis (brown-belted bumble bee), B. fraternus (Southern Plains bumble bee), B. bimaculatus, B. fervidus, B. variabilis, and the Sonoran bumble bee. Common names: Bumble bee, bumblebee, humble bee (archaic). Family: Apidae (genus Bombus). Status in the San Antonio / Boerne corridor: Native and welcome, but they're in decline and are a conservation-priority species.

At a glance #

Identification #

Bumble bees are those chunky, fuzzy, slow-flying bees that most folks find charming. You can't miss them — they're big, round, and pretty noisy, with a thick coat of hair from head to toe.

The biggest mix-up I see is between bumble bees and carpenter bees. Both are large, and at first glance, they have similar yellow-and-black patterns. You can tell them apart by a few key features:

• Bumble bee: These guys are fuzzy all over, even on their abdomen.
• Carpenter bee: They have a fuzzy thorax but a shiny bare black abdomen ("shiny on the hiney").

Bumble bees have these neat pollen baskets, called corbiculae, on their hind legs. You can often spot them heading back to the nest with bright yellow or orange pollen packs. They’re about the size of BBs and really stand out.

Texas is home to nine bumble bee species. You’ll find the most diversity in the eastern half of the state, but it drops off as you head west into the Chihuahuan Desert. In the San Antonio area and the Hill Country, here are the species you’re most likely to see:

• American bumble bee (B. pensylvanicus) — it used to be the most common bee, but now it's a conservation-priority species and is in serious decline.
• Brown-belted bumble bee (B. griseocollis) — easily recognizable with its yellow thorax and brown band, this one is pretty common in gardens.
• Sonoran bumble bee — found mainly in the western areas, it overlaps with the western edge of our service territory.
• Southern Plains bumble bee (B. fraternus) — was once common in Texas, but now it’s also facing a decline.

Biology and behavior #

Annual cycle — the solitary queen's year #

Bumble bee colonies are annual. Unlike honey bees, they don’t survive the winter as a colony. Each year brings a fresh start. Here’s what that looks like around San Antonio:

• Late winter / early spring: A mated queen who hibernated alone — usually a few inches underground — comes out. She hasn’t eaten since last summer and is really hungry.
• Spring: The queen starts foraging to regain her body fat and develop her ovaries. She’s on the lookout for a nest site, which is almost always an existing cavity. An abandoned mouse or vole burrow is her top choice.
• Nest founding: The queen builds a small wax "honeypot" to store nectar, lays her first eggs, and does all the work herself. She’s the worker, forager, nurse, guard, and builder all at once.
• Brooding the eggs: This is one of the coolest aspects of bumble bee biology. The queen incubates her eggs like a bird. She sits right on the wax-capped egg clump, keeping her body temperature around 30°C (86°F) by shivering her flight muscles. A bare patch on her fuzzy abdomen lets heat flow directly to the eggs. If the brood cools below 30°C, the larvae don’t develop properly.
• First workers emerge: About 4–5 weeks after she starts laying eggs, the first workers show up. These smaller, non-reproductive daughters immediately take over foraging while the queen focuses on laying more eggs.
• Colony growth: During summer, the colony expands, usually reaching about 50–500 workers at its peak, but this varies greatly by species.
• Late summer: The queen starts producing new queens (gynes) and males, marking the reproductive phase of the colony.
• Fall: New queens and males leave the nest to mate. Males die shortly after, or they perish from the cold when temperatures drop. Only the newly mated queens survive, finding a spot in the soil to hibernate through the winter.
• The old queen and all workers die. This happens every year. The nest is not reused.

Why a queen's early spring is so hard #

Before her first workers come out, a foundress bumble bee has a tough job. Studies on Bombus terrestris show that a founding queen may visit up to 6,000 flowers in a single day just to gather enough nectar to keep her eggs warm. According to Texas A&M AgriLife Extension, each time she goes out, the brood cools down, so those trips can't take long. If spring is late and flowers are scarce, it can really hurt a queen's chances of starting a healthy colony.

Every decent Hill Country pollinator garden matters. Early-blooming native plants like mountain laurel, Texas redbud, agarita, and early salvias are especially important. They provide food for foundress queens when they're most vulnerable.

Buzz pollination — the bumble bee's specialty #

Bumble bees are the experts in buzz pollination. When a bumble bee lands on a flower that tightly holds its pollen—like tomatoes, peppers, eggplants, blueberries, cranberries, and many native wildflowers—it grips the anther and vibrates her flight muscles at a specific frequency without moving her wings. This vibration releases the pollen in a cloud.

Honey bees simply don’t do this. It’s not part of what they’re built to do.

In commercial greenhouse tomato production, bumble bee colonies are bought and placed inside greenhouses. Without these bees, tomato flowers just won’t pollinate. It’s wild to think a multi-billion-dollar greenhouse industry relies on one genus of bee to do what honey bees can’t.

Bumble bees and temperature — the thermostat insects #

Bumble bees are unique because they can fly in colder weather when other bees are grounded. They have a special ability to raise their body temperature by shivering their flight muscles, which is known as endothermy. On a chilly morning of 50°F, a bumble bee can warm itself up to 30°C before taking off. This is why you might spot those plump bumble bees buzzing around your garden on cool spring days while honey bees are still tucked away in their hives.

This explains their fuzzy coat. That dense hair isn’t just for looks; it helps them keep warm. This thermal insulation allows them to retain the heat they generate. It’s also why they can thrive in high altitudes and northern areas that honey bees can’t handle.

The "pollen constancy" habit #

Bumble bees have a habit called pollinator constancy. They stick to the same flower species during a foraging trip, often working a patch for several minutes while ignoring nearby blooms. This focused behavior makes them better cross-pollinators than bees that flit between different species. For the plants, a bumble bee is an ideal pollinator since her pollen loads mostly contain pollen from just one species. That's exactly what that plant's stigma requires.

Bumble bee intelligence — what the research actually shows #

This is the point where bumble bees go from being charming garden visitors to something that can feel a bit alarming.

Over the past 20 years, research mainly from Lars Chittka's lab at Queen Mary University of London has shown that bumblebees have surprising smarts for their size. Their brains shouldn’t be able to handle these tasks, yet they do. Here’s a partial list of what they can do:

• They can be trained to solve a two-step puzzle box by watching another bee do it first. Published in Nature in 2024, this shows social learning for complex behaviors that one bee alone couldn't figure out. It hints at the start of something like culture in insects.
• They learn to pull strings to get food, and other bees watch them and pick up the same trick.
• They've been shown to roll balls into a target for a reward — a task that has no natural equivalent. Bees trained by demonstrators improved on the technique, indicating they weren't just copying; they were innovating.
• They understand the concept of zero — something seen in primates, corvids, and a few other animals. Interestingly, human children don't grasp this until around age 4. Honey bees have this ability too, while bumble bees are easier to test.
• They can count to four and consistently rank "nothing" as less than "one."
• They socially transmit foraging techniques, including learned nectar-robbing behavior. If one bumble bee discovers she can cut a slit at the base of a flower to steal nectar without pollinating, her nestmates quickly learn the trick.
• They respond to damaged appendages in ways that suggest a pain-like experience, which has become a significant topic in animal welfare research over the past five years.

Bumble bees are important for cognition research for a few reasons. They're easy to track as individuals, can be kept in the lab all year, and their colonies are small enough to paint-mark each bee. This allows researchers to study learning across an entire colony. Along with honey bees, they've become the main insect model for research on intelligence at the edges of what small brains can do.

Every bumble bee you spot on a Texas lantana has a brain with fewer than one million nerve cells — that’s even less than the retina of a single human eye. Inside that tiny brain, the bee is managing a navigation system, a pollen-constancy decision rule, a map from its nest to flowers, and, believe it or not, a way to understand zero.

Local context — San Antonio and the Hill Country #

Bumble bees are everywhere in our residential gardens, from downtown San Antonio to the pollinator beds in Boerne and the larger lots in Bulverde and Spring Branch. You can often find bumble bee foragers on these plants:

• Mealy blue sage (Salvia farinacea) — this is the top plant for attracting bumble bees in Central Texas.
• Cenizo / Texas sage (Leucophyllum frutescens) — a tough plant that thrives in our climate.
• Lantana — both native and cultivated varieties bring in plenty of pollinators.
• Turk's cap (Malvaviscus arboreus) — a great choice for hummingbirds and bees alike.
• Black-eyed Susan, Mexican hat, and other native composites — these are fantastic for supporting local wildlife.
• Tomato, pepper, eggplant plantings — these vegetables benefit from buzz-pollination, making your garden even more productive.

Nest sites on residential property are usually:

• Abandoned rodent burrows can often be found in landscape beds.
• Underneath garden shed floors or deck substructures is another common spot.
• In compost piles (they love the warm, humid conditions — it’s ideal for them).
• In overgrown grass at the edge of acreage properties is where I’ve seen them too.
• Rarely they show up in wall voids, but I’ve come across this in older Hill Country homes with rock exteriors.

The conservation issue #

The American bumble bee (B. pensylvanicus) was once a common sight in Texas, but its numbers have dropped dramatically over the past 30 years. The US Fish and Wildlife Service is currently reviewing its status for a possible listing under the Endangered Species Act. Several factors are driving this decline, including habitat loss, exposure to pesticides like neonicotinoids, diseases from commercial bumble bee colonies used for greenhouse pollination, and the impacts of climate change, according to EPA.

When advising clients in Boerne, Fair Oaks Ranch, and the larger-lot Hill Country communities, bumble bee nest removal should essentially always be the last option. If you find a nest in a compost pile or garden bed, it will die off naturally by November. For nests in genuinely problematic spots — like inside a doorway, in a high-traffic area, or near a child's play zone — we do removals. For everything else, I recommend education and just waiting it out.

Risk to humans and pets #

Low. Bumble bees are the least aggressive social bees you'll find in Central Texas. They sting only when they feel threatened, and that usually happens when you're too close to their nest. If you see them foraging away from the nest, they’re pretty much harmless. I've had bumble bees land right next to me while I was gardening, and they didn't even pay me any mind. You can get really close to them on flowers, and they’ll just keep doing their thing.

The sting of a bumble bee rates a 2.0 on the Schmidt Pain Index, about the same as a honey bee. It feels like "a match head that flips off and burns on your skin." Since their stinger isn't barbed, bumble bees can sting multiple times if they feel threatened. If you're near their nest, they usually give clear warnings—buzzing loudly and flying erratically in front of you—before they actually go for the sting, according to CDC.

Treatment approach #

• First recommendation: leave it alone. The nest will be gone by fall. Mark the entrance with a stake so you know where to avoid mowing. Come back and let us know how it went.
• Second option: relocate. If you have to move the nest, it’s best done at dusk when most workers are inside. Seal the entrance, dig out the nest, relocate it to a safe area away from people, and then reopen it. Success rates can be hit or miss.
• Last option: lethal removal. Only consider this if the nest is really a danger to you or your pets. Apply dust to the entrance at dusk, then seal it off.
• Allergy considerations: If someone with a known allergy lives on the property, the risk changes, and removal is usually the best option.

Odd, funny, and genuinely true #

• Bumble bees warm flowers for other bees. Research has documented that when a bumble bee lands on a flower for a few seconds of warming before nectar-gathering, she raises the flower's internal temperature by a measurable amount. Other pollinators who arrive soon after get a warmer flower, which makes the nectar easier to access. The bumble bees probably aren't doing this on purpose, but the effect is real.
• Bumble bee queens are literally huge. A large American bumble bee queen can weigh over a gram — 10 to 20 times the weight of a honey bee worker. Standing still next to a foraging queen on a salvia in March is a thing you don't forget.
• The phrase "according to aerodynamics, bumble bees shouldn't be able to fly" is a myth — but it has an origin. In the 1930s, a French engineer applied fixed-wing-aircraft equations to a bumble bee and concluded their lift should be insufficient. He was using the wrong model. Bumble bee wings generate lift through complex vortex patterns, not fixed-wing airflow, and modern aerodynamics has no trouble with them. But the myth that "science says they shouldn't fly" stuck for 80 years.
• Bumble bees can learn to roll a ball for a reward. In 2017, researchers at Queen Mary University of London showed bumble bees not only learn a ball-rolling task for sugar water, but when shown a demonstrator bee rolling a ball, the observer bee subsequently used a more efficient ball than the one demonstrated. They are innovating, not just copying.
• Bumble bees have been introduced to New Zealand. In the 1890s, four species were brought from the UK to pollinate red clover. They established and have been there ever since. New Zealand has no native bumble bees.
• The "humble bee" name is older than "bumble bee." Darwin and his contemporaries consistently referred to "humble bees" in their writing — the name comes from the Middle English word for "humming" or "booming." "Bumble bee" won out by the early 20th century, and today "humble bee" reads as affected and archaic, but it was the standard scientific name for decades.
• Bumble bee colonies have a "thermoregulator" caste. When the nest needs to be cooled, certain workers fan their wings at the entrance, exactly like honey bees. When it needs to be warmed, workers cluster over the brood and shiver. The shivering can raise the local temperature in the nest by 10°C or more above ambient.
• Only one bumble bee species has ever been formally documented as going extinct in the wild in North America — Franklin's bumble bee (B. franklini) of Oregon/California, last seen in 2006 and presumed extinct. Several other species, including the rusty-patched bumble bee, are federally endangered.
• Bumble bees can't digest honey the same way honey bees can. They store small amounts of nectar in wax pots, but they don't concentrate it into true, long-keeping honey. The "bumble bee honey" stored in those wax pots is mostly thin, watery, and lasts only a few days — enough to feed the colony through a stretch of bad weather, not enough to carry it through a winter.
• The wings of a bumble bee beat roughly 200 times per second. The distinctive low, loud buzz you hear is at about 180–200 Hz — lower than the 230-Hz buzz of a honey bee. Bumble bees sound bigger than other bees because, acoustically, they are.

Common questions customers ask #

• Is it a bumble bee or a carpenter bee?
• Should I remove a bumble bee nest?
• Are bumble bees endangered in Texas?
• Will a bumble bee sting me?
• How long does a bumble bee colony last?
• What plants attract bumble bees in Central Texas?
• Why are bumble bees important?
• Bumble bee vs. honey bee — what's the difference?

For this information, I've looked into the Bumble Bee Conservation program from Texas Parks and Wildlife, research from the Chittka Lab at Queen Mary University of London (including the Bridges et al. 2024 Nature paper on social learning), as well as the work by Leadbeater & Chittka on social transmission. I also consulted Howard et al.'s 2018 Science paper discussing the concept of zero in honey bees and the US Fish and Wildlife Service's species status reviews for B. pensylvanicus. The regional species distribution is based on inventories of Texas native bees.

Frequently asked questions #

How can I identify a bumble bee? #

Bumble bees are large, fuzzy insects with black and yellow stripes. They have a robust body and are often mistaken for honey bees, but their size and more pronounced fuzziness are key identifiers.

What is the behavior of bumble bees in San Antonio? #

Bumble bees are generally docile and will only sting when threatened. They are important pollinators and can often be seen buzzing around flowers in gardens and parks during the warmer months.

When is bumble bee season in the Texas Hill Country? #

Bumble bee activity typically peaks from late spring through early fall. In San Antonio, you can expect to see them from March until October, with the highest numbers in May and June.

What risks do bumble bees pose to my family? #

While bumble bees are not aggressive, their sting can be painful and may cause allergic reactions in some individuals. It's best to keep a safe distance if you see a nest and avoid provoking them.

How does Pest Trappers treat bumble bee infestations? #

If you have a bumble bee nest on your property, we recommend contacting us for an assessment. We typically relocate the nest when possible, as bumble bees are beneficial for the environment, but we'll ensure your safety and comfort come first.

Last reviewed April 25, 2026 by Travis Lambert (Owner).