Yellowjackets in South Central Texas: Ground Nests and Fall Stings
Smooth black-and-yellow wasps streaming from a hole in your grass, or from a crack in the wall, are almost certainly yellowjackets. Their colonies reach full size in late summer and fall, which is when mowing and weed-eating put people right on top of them. Keep everyone back from the entrance, skip the gasoline and the garden hose, and have an established nest handled by a professional.
To have a nest looked at, call or text (210) 281-1064 or book online.
Spotting a yellowjacket in five seconds #
- Body: roughly half an inch long, smooth, patterned in black and yellow, with clear wings.
- No fuzz: they carry no pollen, though TAIS says people often confuse them with honey bees.
- The queen: the AgriLife field guide describes her as very large and mostly orange, quite unlike the workers.
- The nest: an enclosed paper carton with a single entrance hole.
- The nickname: AgriLife notes yellowjackets often get called "hornets."
Several species live in Texas. AgriLife's B-6118 bulletin profiles the southern yellowjacket and says others occur here too. The AgriLife field guide places the eastern yellowjacket mainly in the eastern part of the state.
Yellowjacket, bee or something bigger? #
- Honey bees are hairy, carry pollen on their legs and build wax comb.
- Paper wasps build an open comb with the cells showing, not a closed carton.
- Baldfaced hornets are black and white, not black and yellow, and hang a gray paper nest in a tree. They belong to the yellowjacket family.
- Cicada killers also come out of holes in the ground, but AgriLife puts them at up to 1 1/2 inches, far bigger than a worker yellowjacket.
- A huge orange wasp in spring or fall may simply be a yellowjacket queen. It is not a European hornet or a giant hornet.
Where nests turn up around the house #
The field guide says nests are usually underground but sometimes end up in wall voids or even indoors, and that this wasp is common in cities. AgriLife's E-239 bulletin widens the list:
- lawns, flower beds and embankments
- trees and eaves
- garages, sheds and porches
- old furniture left outside
An Insects in the City article adds abandoned rodent burrows, which give a queen a ready-made hole.
How big can a Texas nest get? #
The numbers vary by source, and both are worth knowing:
- The AgriLife field guide reports up to 4,000 workers, and nests 6 feet across reported from Texas and elsewhere in the South.
- E-239 describes Texas nests from a few inches wide to 6 feet or more, with up to 45 levels of comb and 20,000 workers.
The yellowjacket year #
- Spring: a queen that survived the winter starts a new colony.
- Summer: workers hatch and the nest grows.
- August to September: colonies peak, per E-239.
- October to November: new queens and males emerge.
- First hard frost: most colonies die.
Fall is the touchy stretch. B-6118 says foragers may be aggressive, especially in fall, and Insects in the City says that in autumn, yellowjacket nests turn up even more often than bee nests.
Can a nest outlast a Texas winter? The sources disagree. The field guide says some colonies here survive several years and keep growing. B-6118 says one nest can be expanded and used again over many years. E-239 says abandoned nests are not reused, though a colony in a sheltered site or a mild winter may carry over.
Stings and the warning signs of an allergic reaction #
B-6118 says southern yellowjackets can sting again and again. Expect sharp, instant pain and local swelling that fades within a few days, though itching can hang on. Disturbing the nest brings many stings at once, and Insects in the City notes that mower vibration alone can set off an attack.
Allergic reactions move fast. E-239 says anaphylaxis usually begins within 20 to 30 minutes, and that shock and death can follow within 10 to 15 minutes. Get medical help quickly for trouble breathing or swallowing, dizziness, vomiting, a rash or fainting.
Deaths are rare but real. By B-6118's estimate, bee and wasp stings kill about 25 people a year nationwide, roughly one of them in Texas, while E-239 gives 40 to 100 a year nationally for ant, bee and wasp stings combined. For an ordinary sting, CDC/NIOSH advises soap and water, ice and no scratching.
Do this, not that #
Do:
- If a nest sits somewhere nobody goes, let it be and post a warning sign beside it.
- Keep lids on trash cans and empty them daily.
- Seal gaps in walls and eaves before a queen finds them.
- If they come after you, cover your head and run for a building or car.
Don't:
- Swat, or jump into a pool.
- Pour gasoline down the hole. The Texas School IPM plan warns of fire and soil contamination.
- Flood a ground nest with liquid. E-239 says it often just soaks into the soil.
- Count on traps. They don't eliminate a colony.
Before you mow: a plan for ground nests #
Mower vibration is one of the triggers AgriLife names, and a hole hidden in tall grass is easy to roll right over. A little planning helps:
- Walk the yard first in late summer and fall, watching for wasps flying low and straight into one spot in the grass.
- Stake and flag any entrance you find, and tell everyone in the house where it is.
- Leave a wide unmowed circle around it until the nest has been handled.
- Keep kids, guests and dogs off that part of the yard.
- If wasps boil out anyway, don't stop to swat. Cover your head and get inside a building or vehicle.
Why you shouldn't plug a hole in your wall #
A yellowjacket colony inside a wall has one way out. Block it while the colony is alive and E-239 warns the wasps may chew or push their way into the house instead. Wall-void colonies take specialized equipment, and E-239 stresses following the product label so nothing causes an electrical short. This is one job to leave alone.
When to call a professional #
Insects in the City says an established colony is work for professionals. Call when:
- the nest is in a wall, attic or other part of the structure
- the entrance is near a door, walkway, play area or the mowing path
- anyone in the home has a heart condition or venom allergy
- the colony has already stung someone
How Pest Trappers handles yellowjackets #
Before anyone gets close, the technician finds every entrance and figures out whether the nest is in the ground, in a structure or somewhere else. That shapes which options make sense, and you'll hear what each involves before work starts. Products are used only as their labels allow.
Pest Trappers LLC (TPCL #0887549) gives a price after the inspection, so call for pricing. See the local pages for Stone Oak, Cibolo, Wimberley, Helotes and Boerne.