Those small holes appearing in your yard, each about the width of a pencil or finger, are almost certainly nests built by solitary ground-nesting bees. Unlike honeybees or yellowjackets, these bees live alone, rarely sting, and are active above ground for only a few weeks each year. Most of the time, the best course of action is to leave them alone.
What a Ground Bee Nest Looks Like
A ground bee nest is a single tunnel dug straight into bare or thinly vegetated soil. Each hole belongs to one female bee, and the entrance is usually surrounded by a small mound of excavated dirt, similar to an ant hill but with a cleaner, rounder opening. Some species, like digger bees, build small chimney-like turrets of soil around the entrance.
You’ll often find dozens or even hundreds of these holes clustered in the same patch of ground. This can look alarming, but it’s not a colony in the way you’d think of a wasp nest. Each bee is working independently. They just happen to prefer the same soil conditions, so they nest near each other in what entomologists call an aggregation. There’s no shared queen and no coordinated defense.
Common Species You Might See
The majority of bee species worldwide are ground-nesters, and several common types show up in North American yards. Mining bees are the most noticeable in early spring, with peak activity between March and May. They’re small, most no larger than a penny, and have fuzzy bodies. Digger bees are rounder and can be mistaken for bumblebees, but you can tell them apart by their legs: bumblebees carry pollen in smooth, shiny “baskets” on their hind legs, while digger bees have hair covering their entire legs.
Sweat bees are another frequent ground-nester. They’re typically much smaller than a penny and range from black to a dull metallic green. Cellophane bees, named for the waterproof, cellophane-like substance they use to line their tunnels, are roughly the same size as mining bees. The southeastern blueberry bee, important for blueberry pollination, also nests in the ground and looks strikingly similar to a bumblebee.
Ground Bees vs. Yellowjackets
This is the distinction that matters most. Ground-nesting bees are fuzzy, docile, and fly away when disturbed. Eastern yellowjackets also nest underground, but they behave completely differently. Yellowjackets form true colonies with a queen, build paper-like nests beneath the surface, and will aggressively defend their territory if you come near.
The quickest way to tell them apart is body hair. Bees have visibly hairy bodies, even from a few feet away. Yellowjackets are smooth and shiny with bold yellow-and-black striping. Behaviorally, ground bees drift slowly in and out of individual holes and show no interest in you. Yellowjackets fly fast, are attracted to food (especially at outdoor meals), and multiple insects will stream from a single hole if the nest is disturbed. If you see a single entrance with heavy, aggressive traffic, that’s likely a yellowjacket colony, not bees.
Do Ground Bees Sting?
Female ground bees technically can sting, but they almost never do. They are not aggressive and do not defend their nests the way social insects do. You would need to handle one roughly or step on it barefoot to provoke a sting. Males, which are often the ones you see hovering and patrolling the nesting area, cannot sting at all. They may fly toward you out of curiosity or territorial habit, but they’re physically incapable of hurting you. Ground-nesting bees are not considered a significant medical threat.
Why They Chose Your Yard
Ground bees are picky about where they dig. Research from the University of Reading found that nest density peaks in sandy loam soils with around 60% sand, 22% silt, and 17% clay. They favor soil that’s relatively dry (around 13-14% moisture content), warm, and moderately compacted. South-facing slopes and sun-exposed patches are especially attractive because they absorb more heat and drain water faster.
Vegetation matters too. The highest nest densities were recorded where about 59% of the ground was bare, with the remainder covered by thatch, moss, or sparse green growth. Thick, lush grass discourages nesting. This is why ground bees tend to show up in thin or patchy lawns, garden beds, gravel edges, and dry sunny spots where the soil is exposed.
Their Short, Busy Season
Ground bees are only active above ground for a few weeks. The most conspicuous burst of activity typically happens in March, when dozens to hundreds of bees emerge from the ground after developing as larvae underground the previous year. During this window, the adults mate, the females dig new tunnels, lay eggs, and provision each egg chamber with pollen. Then the adults die. The larvae develop slowly underground through summer and fall, overwintering in their tunnels until the following spring.
This short lifecycle is why patience is usually the best approach. Whatever disruption you’re experiencing will resolve on its own within a month.
Why Ground Bees Are Worth Keeping
Ground-nesting bees are effective pollinators of both crops and native plants. Evidence of their value as crop pollinators is growing, with species like the southeastern blueberry bee playing an outsized role for specific fruit crops. Their tunneling also loosens compacted soil and improves drainage, functioning as a natural form of aeration. Killing them with pesticides removes pollinators your garden and local ecosystem depend on, with no real safety benefit.
How to Move Them Along Without Chemicals
If the nests are in a high-traffic area where you’re concerned about bare feet or pets, the simplest solution is water. Ground bees prefer dry soil, and running a sprinkler over the nesting area will encourage them to relocate. No pesticides are needed.
If ground bees return to the same spot year after year, you can prevent them from settling in by watering that area before they emerge in early spring. Keeping the soil consistently moist during March makes the site unappealing. Adding mulch or growing denser ground cover also reduces the bare, sun-warmed soil they look for. Conversely, if you want to encourage ground bees elsewhere on your property, leaving a dry, sunny patch of bare or thinly vegetated soil gives them an ideal place to nest away from foot traffic.