Wasps have a bad reputation, and some of it is earned: they sting, some sting repeatedly, and a few kinds defend their nests aggressively. But "bad" is only half the story. Scientists who study wasps say they're among the most useful insects in your yard, eating huge numbers of caterpillars and other pests. This guide gives you both sides: what wasps really do wrong, what they do right, why they seem worse in late summer, and when a wasp nest actually needs to go.
Are wasps bad? For people, sometimes: their stings hurt, can be dangerous for anyone allergic, and yellowjackets in particular defend their nests hard. For gardens and ecosystems, mostly no: a 2021 scientific review found wasps act as predators, pollinators and decomposers, and provide natural pest control that's "substantial, but largely overlooked."
The practical answer: leave wasps alone when they're away from people. Deal with nests near doors, play areas and walkways, especially yellowjacket nests in the ground or walls.
Why Wasps Are Bad
- They sting, and some can sting more than once. Clemson Extension notes yellowjackets can sting repeatedly. The CDC counted 1,109 deaths from hornet, wasp and bee stings in the US from 2000 to 2017, an average of about 62 a year (that figure includes bees).
- Stings can be dangerous for people with allergies. The American College of Allergy, Asthma and Immunology says life-threatening sting reactions affect 0.4 to 0.8% of children and about 3% of adults.
- Some defend their nests aggressively. Yellowjackets nest in the ground and in walls, where people mow over or bump into them. A crushed wasp releases an alarm scent that can bring more. See are wasps dangerous.
- They crash outdoor meals in late summer. Yellowjackets scavenge for sweets and meat around picnics, trash cans and drinks.
- Nests in the wrong places cause trouble. A yellowjacket nest in a wall can chew through into living space if the entrance is blocked.
Why Wasps Are Also Good
- They're natural pest control. In a 2024 study published in the Journal of Economic Entomology, native paper wasps (Polistes metricus) were "100% effective at removing all caterpillars" from broccoli plants in a test greenhouse, and plant damage dropped. Another paper wasp species removed over 80% of caterpillars from kale within 3 hours.
- They're top predators in the insect world. A 2026 study of yellowjacket nests in England, where they're native, describes them as "apex predators" that help regulate other insect populations.
- They do more than hunt. A 2021 review in Biological Reviews by Brock, Cini and Sumner, the first comprehensive look at what wasps contribute, found they act as predators, parasites, pollinators, decomposers and seed dispersers.
- Some target lawn pests. The blue-winged wasp hunts green June beetle grubs in the soil (Penn State). See how to get rid of June bugs.
So why do people hate them? A 2018 study by Sumner, Law and Cini surveyed about 750 people and found wasps are "universally disliked," described in emotional, negative words, while bees get positive ones. The researchers concluded the main reason is that most people don't know what wasps do for us. On Reddit (via Google search excerpts), gardeners make the same point: one wrote that wasps "prey upon a lot of bad pests, and even provide pollination."
Which Wasps Are the Problem?
| Wasp | Trouble for people? | Good for the yard? |
|---|---|---|
| Yellowjackets | The main problem: ground and wall nests, defensive, sting repeatedly, scavenge food in late summer | Yes, they eat many insects |
| Bald-faced hornets | Defensive around their big enclosed nests; Clemson notes they can squirt venom | Yes, predators |
| Paper wasps (including red wasps) | Usually only when the nest is disturbed; nests near doors are the issue | Yes, strong caterpillar hunters |
| Mud daubers | Rarely; Clemson says they're not aggressive and rarely sting | Yes, they hunt spiders |
| Solitary wasps (cicada killers, blue-winged wasps) | Rarely; they're solitary and not defensive like colony wasps | Yes |
For identification, see yellowjackets vs. wasps vs. hornets.
Why Wasps Seem Worse in Late Summer
University of California guidance explains that from spring to midsummer, wasp nests are growing, and workers mostly hunt insects to feed the young. Colonies are largest by late summer, and the University of California notes that wasps become more defensive as the season goes on. Clemson says yellowjacket populations peak around August, with most conflicts in late summer and fall. That's when they show up at drinks and trash cans, and when mowing over a ground nest is most likely to go badly. If wasps seem worse "this year," you're often seeing a bigger-than-usual colony nearby, or one nest close to where people spend time. See why you have so many wasps in your yard.
When a Wasp Nest Needs to Go
- Remove or treat nests near doors, windows, decks, play areas, walkways and HVAC units; any yellowjacket nest in the ground where people walk or mow; any nest in a wall; and any nest if someone in the home is allergic to stings.
- Consider leaving paper wasp and mud dauber nests that are well away from people. They'll keep eating caterpillars and spiders, and the colony dies off in winter.
To handle it yourself safely, see how to safely deal with a wasp nest. For costs, see wasp nest removal cost. Our wasp control service covers South Carolina, North Carolina and Virginia.
¿Las avispas son buenas o malas?
Las dos cosas. Las avispas pican, algunas pueden picar varias veces, y su picadura puede ser peligrosa para personas alérgicas. Las avispas amarillas (yellowjackets) son las más agresivas cuando alguien se acerca a su nido, que suele estar en el suelo o dentro de las paredes. Pero las avispas también son útiles: comen orugas y otros insectos que dañan las plantas, y algunas ayudan a polinizar. Un estudio de 2024 encontró que las avispas papeleras eliminaron todas las orugas de plantas de brócoli en un invernadero. Lo práctico es dejar en paz los nidos alejados de las personas y quitar los que están cerca de puertas, caminos o zonas donde juegan los niños.
Key Takeaways
- Wasps are bad for people mainly because of stings, especially yellowjackets and for anyone allergic.
- Wasps are good for gardens: they eat caterpillars and other pests, and some pollinate.
- Yellowjackets cause most of the trouble; paper wasps and mud daubers rarely sting.
- Wasps seem worse in late summer because colonies are at their biggest and most defensive.
- Remove nests near people; leave the rest alone.
Frequently Asked Questions
Mainly because of their stings. Some wasps, especially yellowjackets, can sting repeatedly and defend their nests aggressively, and stings can be dangerous for people with allergies. Yellowjackets also scavenge food and drinks in late summer and nest in the ground and walls, where people run into them.
Yes. A 2021 scientific review found wasps act as predators, parasites, pollinators, decomposers and seed dispersers, and provide substantial natural pest control. In a 2024 study, native paper wasps removed all of the caterpillars from broccoli plants in a test greenhouse.
Usually because a large colony is nearby or a nest is close to where people spend time. Wasp colonies are biggest in late summer, and University of California guidance notes they become more defensive as the season goes on. Clemson says yellowjacket conflicts peak in late summer and fall.
Leave nests that are well away from people, especially paper wasps and mud daubers, which rarely sting and eat garden pests. Remove or treat nests near doors, walkways, play areas and HVAC units, any yellowjacket nest in the ground or walls, and any nest if someone in the home is allergic.
A 2018 study of about 750 people found wasps are universally disliked and described in negative, emotional words, while bees are described positively. The researchers concluded the main reason is that people know bees pollinate but don't know what wasps do, such as controlling crop pests.
Yellowjackets and bald-faced hornets are the most defensive around their nests. Paper wasps usually sting only when the nest is disturbed, and mud daubers and solitary wasps like cicada killers rarely sting.
No del todo. Pican y pueden ser peligrosas para personas alérgicas, sobre todo las avispas amarillas cerca de su nido. Pero también son útiles: comen orugas y otras plagas del jardín, y algunas ayudan a polinizar. Conviene quitar solo los nidos que están cerca de las personas.
Sources: R. E. Brock, A. Cini & S. Sumner, "Ecosystem services provided by aculeate wasps," Biological Reviews (2021); S. Sumner, G. Law & A. Cini, "Why we love bees and hate wasps," Ecological Entomology (2018); J. M. Jandt, E. McCall & A. L. Toth, "Native Polistes wasps hold potential as biocontrol agents for lepidopteran pests of Brassica," Journal of Economic Entomology (2024); R. Drinkwater et al., yellowjacket larval diets, Insectes Sociaux (2026); University of California Statewide IPM Program, "Yellowjackets and Other Social Wasps" (7450); Clemson Cooperative Extension HGIC, yellowjacket, paper wasp, mud dauber and baldfaced hornet fact sheets; CDC, MMWR QuickStats 68(29) (2019); American College of Allergy, Asthma and Immunology, "Insect Sting Allergies"; Penn State Extension, "Green June Beetle"; Reddit r/gardening (via Google search excerpts).
Photo credits: Xorx, CC BY-SA 4.0; Desislav Iliev, CC BY 4.0; via Wikimedia Commons.