You step out into the yard and spot a patch of little holes in the dirt, each with a tiny pile of soil around it, and bees zipping low over the ground. Before you grab a can of spray or the garden hose, take a breath. Most of the time, those "ground bees" are some of the gentlest neighbors you will ever have.
Short answer: Most ground bees in Southern California yards are solitary native bees, such as mining bees, that rarely sting and fly for only a few weeks. If you can, leave them alone. The two look-alikes worth worrying about are ground-nesting yellow jackets and honey bees living in a valve box, meter box or old burrow.
What are ground bees?
"Ground bees" isn't one species. It's a catch-all name for the many native bees that dig their nests in soil. According to UC Master Gardeners, about 70% of native bees nest in the ground, and California is home to roughly 1,600 native bee species. The ones homeowners notice most are mining bees, sweat bees and plasterer bees.
Here's the key thing: these bees are solitary. There's no queen, no hive and no honeycomb. Each female digs her own tunnel, stocks it with pollen and nectar, and lays her eggs inside. They just like the same kind of real estate, so you can end up with dozens or even hundreds of holes in one sunny patch. That's a neighborhood of individual nests, not a colony.
Signs you're looking at solitary ground bees:
- Lots of small holes, about 1/4 inch across, sometimes ringed with a little mound of loose soil
- Bare, dry, well-drained ground or thin, patchy grass
- Bees that vary in look: some darker than a honey bee, some striped, some a shiny metallic green, many smaller than a honey bee
- Low, wandering flights, with one bee at a time going into its own hole
Are ground bees aggressive?
No. University extension services describe solitary ground bees as non-aggressive, and they seldom sting. Oregon State University Extension notes that male ground bees don't even have stingers. That swarm of bees you see hovering and darting over the holes in spring is often males in a mating display. It looks dramatic, but they can't hurt you.
Females can sting, but it usually takes something like stepping on one barefoot or trapping one in your hand, and the sting is mild. With no hive to defend, they don't come boiling out of the ground the way a yellow jacket nest will.
They also don't stay long. The University of Maryland Extension says the flying season of these bees lasts only about 2 to 4 weeks. After that, the adults die off and the next generation develops quietly underground until next year. Meanwhile, they're pollinating your garden for free.
Ground bees vs. yellow jackets vs. honey bees: how do you tell them apart?
This is the question that really matters, because the three call for completely different responses. Watch from a safe distance for a few minutes and compare what you see:
| Solitary ground bees | Yellow jackets in the ground | Honey bees in the ground | |
|---|---|---|---|
| Look | Varies: dark, striped or metallic green; often smaller than a honey bee | Smooth, shiny, bright yellow and black with jagged bands and a narrow waist | Fuzzy, golden-brown, less brightly striped |
| Entrance | Many small holes, often with a little soil mound | Usually one hole, often an old rodent burrow | A gap in a valve box, meter box, burrow or crack |
| Traffic | One bee at a time, each to its own hole | Steady stream in and out of the same hole | Heavy, steady stream; you may hear a hum |
| Inside | Single tunnels with pollen for each egg | Gray paper nest | Wax honeycomb, honey and brood |
| Temperament | Very docile | Defensive, more so in late summer and fall; can sting repeatedly | Will defend the nest; treat every colony with respect |
| How long | A few weeks | Usually one season | Stays and grows until removed |
| What to do | Leave alone or discourage | Professional yellow jacket removal | Live honey bee removal |
Why ground-nesting yellow jackets are a different story
The most common yellow jacket in California is the western yellowjacket, and according to UC IPM it usually nests underground in cavities like old rodent burrows. Inside is a paper nest that, depending on the species, can house anywhere from 1,500 to 15,000 workers by the end of the season. They hunt insects early in the year, then scavenge for sweets and protein later, which is why they crash your barbecue in late summer.
Unlike a honey bee, a yellow jacket's stinger has no barbs, so one wasp can sting you again and again. A whole nest that feels threatened by a lawn mower, a weed trimmer or a foot in the wrong place can be dangerous. Don't pour gasoline down the hole, don't try to plug it, and don't mow over it. If you've got yellow jackets coming out of the ground, see my yellow jacket removal page or read up on yellowjacket control that actually works.
When "ground bees" are actually honey bees
Honey bees don't dig, but they love an enclosed, dark space, and our yards are full of them at ground level. Irrigation valve boxes, water meter boxes and abandoned animal burrows can all end up holding a honey bee colony. Orange County Mosquito and Vector Control lists water meter boxes and animal burrows among the places these colonies set up.
A honey bee colony in the ground is not a "leave it alone and it'll leave" situation. The bees build wax comb, store honey, raise brood and stay put, with the colony growing over time. And here in Southern California, it's important to remember that Africanized honey bees have spread through all of the region's counties, according to UC Riverside. You can't tell them apart from gentler bees by looking, so don't lift the lid on that sprinkler box to check.
This is exactly the kind of job I handle. I remove the bees alive along with all the comb, then relocate the colony to a vetted local beekeeper. You can read more about how that works on my bee hive removal and bee relocation pages.
How do you get rid of ground bees?
For the solitary kind, the honest answer is that you usually don't need to. They're gone in a few weeks, they rarely sting, and they're doing good work for your plants. To be clear: I don't remove solitary ground bees as a service. But if the nests are right where your kids play or your dog digs, here's what extension experts suggest:
- Wait it out. Their flying season is short. Mark the area and use another part of the yard for a couple of weeks.
- Keep bare feet and pets off the patch. That's how most of the rare stings happen.
- Water the area. Ground bees prefer dry soil, and heavy watering with a sprinkler discourages nesting. Just stay within your city's current watering rules.
- Cover the bare ground. For long-term prevention, fill bare spots with dense turf, a groundcover or a heavy layer of mulch so there's no open soil to dig in.
- Skip the pesticides. These are valuable pollinators, and Utah State University Extension describes their nests as a minimal health risk to people.
When should you call a professional?
Call for help if you notice any of these:
- A single hole with a constant stream of insects going in and out
- Bright yellow and black, smooth-bodied wasps rather than fuzzy bees
- Bees coming and going from a valve box, meter box, block wall or burrow
- A humming sound from the ground, or comb you can see through a gap
- Anyone in the home with a serious sting allergy
If someone gets stung many times, or has trouble breathing or swelling of the face or throat after a sting, call 911 right away.
Need a hand?
Not sure what's buzzing around your yard? I'm a certified local beekeeper, and I offer free inspections. I'll come out, tell you exactly what you've got, and give you honest advice, even if the answer is "leave them be." If it turns out to be honey bees, I'll remove them alive with no chemicals. I help homeowners from Corona to Rancho Cucamonga and across Orange County, the Inland Empire and LA County. Call me at (626) 487-6052 or request a free quote.
