Yes—many wild bees nest underground. Mining bees in the genus Andrena are familiar examples, and North Carolina extension guidance also lists Anthophora, Colletes, Habropoda, and Lasioglossum among genera that commonly nest in aggregations there. A few small holes or soil mounds cannot identify a species by themselves, however. The reliable approach is to consider the entrance, habitat, season, and the insect using it together, then obtain local identification before disturbing the site.
What ground-nesting bees are you likely to see?
Ground nesting is a normal strategy for a large share of wild bees. Mining bees are usually solitary: one female digs and provisions her own nest, even when hundreds of individual nests are packed into the same patch of soil. An aggregation can therefore look like a colony while lacking the shared brood chambers and defensive behavior associated with honey-bee hives.
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Andrena mining bees
Andrena is one of the best-known mining-bee genera. In North Carolina, many species are most noticeable from March through May, although some are active at other times. Females excavate individual burrows, collect pollen and nectar, place the food in underground cells, and lay an egg in each provisioned cell. The young develop below ground and emerge according to the species’ life cycle.
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NC State Extension lists Anthophora, Colletes, Habropoda, and Lasioglossum as additional genera that commonly form nesting aggregations in North Carolina. The guide estimates approximately 212 species across five genera in such aggregations. That is a North Carolina estimate, not a worldwide inventory or a count that applies to every state.
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North Carolina has more than 500 native bee species overall, according to N.C. Cooperative Extension. That larger figure includes bees with other nesting habits and should not be treated as a total for underground nesters.
How to tell a possible bee nest from a hole in the ground
Do not label every small opening a bee nest. Ants, solitary wasps, beetles, spiders, and other animals can leave similar entrances. Look for several clues at once rather than relying on a single hole.
| Clue | What it suggests | Why it is not conclusive |
|---|---|---|
| Small round openings, sometimes with a low mound of loose soil | A female may have excavated a vertical or branching tunnel. | Many ground-dwelling insects move soil in the same way, and some bee nests leave almost no visible mound. |
| Several entrances close together | An aggregation of solitary nests is possible. | Aggregations can also contain more than one insect group, and proximity does not prove a shared colony. |
| Sunny, well-drained bare soil or thin turf | This is typical habitat for many ground-nesting bees. | Other insects also select warm, open ground. |
| Bees repeatedly entering and leaving, or flying low over the surface | Occupants are more likely to be bees than an abandoned hole. | Correct identification still requires seeing the insect well enough to distinguish it from a wasp or another fly. |
| A turret or raised soil rim | Some species build a more obvious entrance structure. | Entrance architecture varies by species, soil, moisture, and weather. |
NC State Extension specifically warns that ground nests can be mistaken for other insect nests and recommends identifying the occupants before removal. Photograph the area from a distance, note the date and weather, and observe whether insects actually use the openings. Do not dig into a nest to confirm it.
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Where underground bees choose to nest
Many species favor exposed, sparsely vegetated soil with good drainage. Thin lawn, compacted edges, south-facing banks, garden paths, and other patches where grass does not form a dense mat can provide suitable ground. Texas Parks and Wildlife Department describes well-drained, sparsely vegetated bare patches as preferred habitat for many ground-nesting bees.
Sunlight helps warm the soil, while poor drainage can flood tunnels and brood cells. A site may be only a few feet across, so an entire lawn does not need to be suitable for an aggregation to appear. Conversely, a nest can be present without a conspicuous mound if rain, wind, mowing, or foot traffic has erased the excavated soil.
What happens below the surface?
Digging and branching tunnels
A solitary female generally performs the excavation herself. The tunnel may run downward and branch into side chambers. The Missouri Department of Conservation describes individual brood cells along branching tunnels for mining bees. The visible entrance is therefore only a small part of the nest.
Provisioning each brood cell
The female carries pollen and nectar into a cell, forms a food supply for the developing larva, and lays an egg. She closes or seals the cell before preparing another. The larva consumes the stored food underground, passes through its immature stages, and eventually emerges as an adult.
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Emergence and overwintering
Timing differs among genera, species, and regions. The Maryland Extension account of mining bees says adults overwinter at the burrow site, while emergence and visible flight occur when local conditions and the species’ schedule align. Do not apply the March–May Andrena peak reported for North Carolina to every ground-nesting bee or every location.
Are bees in a lawn dangerous?
Most solitary ground-nesting bees are described by extension and conservation agencies as generally non-aggressive or seldom stinging. A female is focused on collecting food and caring for her own nest, not defending a large communal hive. A busy patch of entrances can therefore be alarming without representing a defensive colony.
That does not make handling safe. Avoid touching bees, blocking entrances, digging, or placing hands and feet directly over active holes. People with a known severe sting allergy should follow their clinician’s emergency plan, and children and pets should be kept from deliberately disturbing the area. Do not promise that any bee is incapable of stinging: species, sex, handling, and individual circumstances matter.
How to distinguish similar-looking bees
Digger bees and bumble bees
Some Anthophora digger bees can resemble bumble bees at a glance. NC State Extension notes that Anthophora pollen-collecting hairs cover the hind legs, whereas bumble bees have pollen baskets. This is an observation clue, not a complete field key; color, lighting, sex, and viewing distance can mislead.
Bumble bees themselves may use abandoned rodent burrows or grass tussocks rather than digging their own underground nest, according to Texas Parks and Wildlife Department. A hole occupied by a bumble bee is therefore not evidence that the bee excavated it.
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Bee or another insect?
Watch the insect’s body and flight without trying to catch it. A bee may carry visible pollen, repeatedly visit flowers, and enter the same opening. Solitary wasps can also patrol holes and provision young, and their body shape and behavior can overlap with bees. A clear photograph of the insect from above and from the side, plus the location and date, gives a local extension specialist more information than a hole description alone.
Why these bees matter
Ground-nesting bees contribute to pollination of wild plants and crops. The Missouri Department of Conservation field guide states that about 30 percent of U.S. crops rely on native bees for pollination. That figure is presented as a broad national context, not as a measurement of one lawn or one bee species.
Preserving a nesting patch also preserves the surrounding network of flowers, undisturbed soil, and seasonal resources that support adult bees. A nest may be occupied for only part of the year, but the site can be valuable habitat when managed without unnecessary disturbance.
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What to do if the nest is in an inconvenient place
When leaving it alone is practical
If the aggregation is outside a main walkway, play area, or work zone, the lowest-impact response is to mark it mentally, keep people and animals from deliberately disturbing it, and leave the soil intact. Avoid insecticide applications: extension guidance favors cultural habitat changes over chemical treatment for these nests.
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When the location must change
NC Cooperative Extension recommends waiting until seasonal activity has ended before altering the site, then covering the area or improving turf. Maryland Extension also describes habitat changes that can discourage future nesting. Exact timing depends on the species and local conditions, so observe for continued entrance use rather than assuming a calendar date means the nest is empty.
- Confirm activity. From a safe distance, determine whether bees are still entering and leaving. If you cannot identify the occupant, contact your local cooperative extension office.
- Choose a nonchemical change. After activity has ended, establish denser turf or cover the bare patch in a way suited to the site. Do not pour liquids or dust pesticides into holes.
- Protect the replacement area. Keep the soil from becoming repeatedly bare and well-drained if your goal is to discourage another aggregation in a high-traffic spot.
- Reassess next season. Some adults return to the same general area, while others use nearby suitable ground. Continue to watch for activity before mowing, digging, or applying products.
When professional advice is warranted
Ask a local extension office or qualified local expert for help when the insects are unidentified, the site is beside a doorway or children’s play area, someone in the household has a serious sting allergy, or removal is being considered. Regional experts can account for local species, emergence periods, and legal or conservation considerations that a generic photograph cannot establish.
Can planting flowers solve a ground-nesting problem?
Native flowers can provide forage for adult bees, and regionally appropriate native seed or plants may improve habitat. Planting does not create an underground nest by itself, however, and it is not required to identify or manage an existing aggregation. Flowering plants should be selected for local conditions and maintained without disturbing active nest entrances.
Bee hotels are not a solution for bees that excavate soil. Artificial cavities serve some cavity-nesting species, while mining bees and many other ground nesters need suitable earth instead. Installing a hotel will not relocate an underground aggregation.
A practical identification checklist
- Record the location, date, sunlight, soil moisture, and vegetation cover.
- Count whether entrances are isolated or clustered, without probing them.
- Look for loose soil, a rim, or a turret, while remembering that some nests show little surface evidence.
- Observe the insect entering or leaving and photograph it from a distance.
- Note nearby flowers and whether the insect carries pollen.
- Compare the season with local records; for example, North Carolina Andrena activity commonly peaks March–May.
- Use a cooperative extension office or qualified local expert for confirmation before removal.
The strongest conclusion you can draw from holes alone is that an underground nest is possible. Combining habitat, entrance pattern, behavior, season, and an identified occupant can make the assessment useful without pretending that a single lawn photograph provides a species-level diagnosis.
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