If you’ve noticed wasps getting bolder lately, buzzing your soda can, dive-bombing you off the porch, showing up in numbers that feel personal, it’s not your imagination. Late August is peak wasp season, and there’s a real reason for it that has nothing to do with them just being jerks (though, also that).
Earlier in the summer, worker wasps are focused on feeding larvae back at the nest, which means they’re out hunting protein, mostly other insects, and mostly minding their business. By mid-to-late August, the queen stops laying new eggs and the colony’s job shifts. There are no more larvae to feed, which means no more larvae drool for the workers to eat (yes, that’s a real thing, it’s basically their sugar reward). So the workers go looking for sugar elsewhere. That’s your picnic, your trash can, your kid’s abandoned juice box on the patio. A colony that might have been 100 wasps in June can be 3,000-plus by now, all suddenly obsessed with anything sweet and increasingly willing to defend territory that never used to bother them.
How to tell if you have a nest problem, not just visitors
A few wasps circling your grill doesn’t mean there’s a nest nearby, they’ll travel a good distance for a decent food source. But if you’re seeing consistent traffic, especially wasps flying in and out of the same spot, like a gap in siding, a vent, a hole in the ground, or up under the eaves, that’s a nest. Paper wasps build the open, umbrella-shaped nests you can actually see. Yellowjackets and hornets are the ones to really watch for, since their nests are often hidden in wall voids, attics, or underground, and their colonies get much bigger and much more defensive.
What actually works (and what doesn’t)
Do this at dusk or after dark. Wasps are far less active and less likely to swarm when it’s cool and dark out, which sounds obvious but people skip it constantly and regret it. Use a red-tinted flashlight if you can, wasps see red poorly, so it lets you work without lighting up the nest like a signal flare.
- For visible, accessible nests: A wasp-and-hornet spray with a long-range jet stream is the way to go, you want distance between you and the nest, not a can that sprays 3 feet. Something like a foam-expanding wasp spray works well because it sticks to the nest instead of just misting the air.
- For nests in walls or attics: Don’t seal the entry hole first. Trapped wasps will chew their way into your living space instead, which is a much worse Tuesday than the one you’re currently having. Treat the entrance, wait a few days, then seal it once activity has stopped.
- For underground nests: These are the ones that send the most people to urgent care, since lawnmowers and foot traffic set them off. Treat the entrance in the evening and keep well clear, the colony can be much larger than the hole suggests.
- For anything bigger than a golf ball, hidden, or up high: Just call a pest control pro. It’s not worth the sting risk, and if anyone in the house has had a bad reaction before, skip the DIY entirely.
The EPA has decent guidance on identifying different species if you’re not sure what you’re dealing with, since the approach for a paper wasp nest under a deck rail is a lot more casual than what you’d want to do with an underground yellowjacket colony.
One more thing worth doing this time of year: keep outdoor trash cans sealed tight and rinse recycling before it goes in the bin. Sugary residue is basically a wasp beacon in late summer, and cutting off the easy food source does more to keep them away from your patio than any spray ever will.
