If it seems like wasps, hornets, and yellowjackets are everywhere in late summer, you’re not imagining it.
By August and early September, many stinging insect colonies have reached their largest size of the year. Nests that started with a single queen in the spring may now contain hundreds—or, in some cases, thousands—of insects.
That means more activity around your home, more insects searching for food, and more workers defending their nests.
For Wisconsin homeowners, late summer can be one of the busiest times of the year for wasps, hornets, and yellowjackets. You may suddenly notice them around your deck, garbage cans, patio, garage, soffits, trees, or even flying in and out of a small opening in your home.
And unlike many other insects, stinging insects can quickly turn from an annoyance into a safety concern.
So why do they seem so aggressive in late summer? And what should you do if you discover a nest around your home?
Late Summer Is When Stinging Insect Colonies Are at Their Largest
Most social wasp colonies begin in the spring.
A queen emerges after winter and starts building a small nest. She lays eggs, raises the first generation of workers, and eventually those workers take over the job of expanding the colony.
As the summer progresses, the nest continues to grow.
By late summer, what began as a small nest may have developed into a large, active colony with many workers coming and going throughout the day.
This is one of the main reasons homeowners notice more wasp and hornet activity in August.
There are simply more insects outside.
A nest that may have gone unnoticed in June can become impossible to ignore by August. You may suddenly see dozens of insects flying around one location, repeatedly entering and exiting a gap in the siding, flying around the eaves, or gathering around a nest in a tree or shrub.
The larger the colony becomes, the more protective the workers can be of their home.
Why Do Wasps and Yellowjackets Seem More Aggressive?
Wasps and yellowjackets aren’t necessarily looking to attack people.
Most of the time, they are busy collecting food and protecting the colony.
The problem is that late summer brings together several factors that can make encounters with people more likely.
First, the colonies are at their peak size.
Second, there are more workers actively searching for food.
Third, people are spending plenty of time outside.
Backyard cookouts, family gatherings, outdoor sporting events, patios, decks, picnics, and other late-summer activities can all put people in the same areas where yellowjackets and other wasps are searching for food.
Sweet drinks, fruit, garbage, food scraps, meat, and other items can attract them.
If someone accidentally gets too close to a nest, steps on a hidden ground nest, or disturbs the area around a colony, the insects may react defensively.
That’s when a simple pest problem can become a painful experience.
Yellowjackets Can Be Especially Problematic in Late Summer
When most people say they are seeing “bees” around their home, they are often actually dealing with yellowjackets.
Yellowjackets are wasps and can be particularly aggressive when their nest is disturbed.
They may build nests underground, inside wall voids, beneath decks, around landscaping, or in other protected locations.
This creates a problem because homeowners may not even know the nest is there.
A person mowing the lawn, trimming landscaping, moving a piece of equipment, or simply walking through the yard can accidentally disturb a hidden nest.
Once the colony feels threatened, multiple yellowjackets may come out to defend it.
Unlike honey bees, yellowjackets can sting more than once.
This is why we strongly recommend homeowners avoid trying to dig up, flood, burn, or physically destroy an active yellowjacket nest.
A nest may look small from the outside, but there can be a much larger colony below ground or inside a structure.
Paper Wasps, Hornets, and Yellowjackets Build Different Types of Nests
Not all stinging insects behave the same way, and not all nests look alike.
Paper Wasps
Paper wasps often build the open, umbrella-shaped nests that homeowners may see underneath eaves, porch ceilings, deck railings, and other protected areas.
Because the nest is visible, homeowners are often tempted to knock it down themselves.
That can be a mistake.
Even a relatively small nest may contain several defensive wasps. Spraying or knocking down a nest from a ladder can also create an additional fall hazard.
Yellowjackets
Yellowjackets can build nests underground or inside protected voids.
This makes them especially concerning because the nest may not be visible until someone accidentally disturbs it.
You may notice yellowjackets repeatedly flying in and out of one small hole in the ground or an opening around your home.
If you see consistent traffic going into the same location, there’s a good chance you are dealing with an active nest.
Bald-Faced Hornets
Despite their name, bald-faced hornets are actually a type of wasp.
They build large, enclosed, paper-like nests that can often be found in trees, shrubs, and sometimes on buildings.
These nests can become quite large by late summer.
Bald-faced hornets are known for strongly defending the area around their nest, which is why homeowners should never attempt to knock down or disturb an active nest.
Why You Shouldn’t Try to Remove a Large Nest Yourself
We understand the temptation.
You see a nest, grab a can of wasp spray, and think you’ll take care of it yourself.
Sometimes a small, easily accessible nest may be handled by a homeowner. But large nests, hidden nests, nests inside a structure, or nests in difficult-to-reach areas are a different story.
There are several reasons DIY stinging insect removal can go wrong.
You May Not Know Where the Entire Nest Is
If insects are entering a wall, soffit, attic, or other enclosed area, you may only see the entrance.
The actual nest could be much larger and deeper inside the structure.
Simply spraying the opening may not eliminate the colony.
You Could Drive Insects Into Your Home
This is especially important when a nest is inside a wall or other structural void.
Improper treatment can cause surviving insects to look for another way out.
Unfortunately, that exit may lead into your living space.
Instead of having yellowjackets outside, you could suddenly have them appearing in bedrooms, bathrooms, or other rooms inside the home.
You Can Get Stung Multiple Times
When a colony feels threatened, several insects may defend the nest at once.
This can be particularly dangerous for anyone with an allergy to insect venom, but even people without an allergy can experience serious discomfort when they receive multiple stings.
Children and pets can also accidentally disturb a nest without realizing the danger.
Signs You May Have a Wasp or Hornet Nest
You don’t always see the nest itself.
Watch for these common warning signs:
- Wasps or yellowjackets repeatedly flying in and out of the same opening
- Large numbers of stinging insects around your roofline
- Insects gathering around soffits or vents
- A visible paper nest underneath an eave or deck
- A large, enclosed nest in a tree or shrub
- Yellowjackets flying close to the ground in one area
- Increased stinging insect activity around a patio or deck
- Wasps or hornets appearing inside your home
- A steady buzzing sound coming from a wall or ceiling
One insect flying through your yard usually isn’t a reason to panic.
But repeated activity in one specific location is worth investigating.
Can Wasps and Hornets Become More Noticeable as Summer Comes to an End?
Absolutely.
As summer winds down, food availability and the needs of the colony can change. Workers may become more noticeable around human food and outdoor activities.
That’s why yellowjackets often seem to become a major nuisance at picnics, sporting events, cookouts, and other outdoor gatherings in late summer.
This is also the time of year when nests are at or near their maximum size.
A small nest discovered earlier in the season may have been relatively easy to manage. Waiting until late summer can mean dealing with a much larger and more active colony.
If you know you have an active nest near an entrance, playground, patio, deck, or another frequently used area, it’s usually better to address the problem before someone accidentally disturbs it.
What Should You Do If You Find a Stinging Insect Nest?
First, keep your distance.
Don’t throw objects at the nest, hit it with a broom, spray it from a close distance, or try to cover the entrance with foam or other materials.
If the nest is underground, mark the area so children and visitors know to avoid it.
Keep pets away as well.
If you are seeing insects entering a hole in your siding, wall, soffit, or another part of the home, resist the urge to immediately seal the opening. If the colony is still active, sealing the entrance can potentially cause the insects to search for another route out.
Instead, have the situation professionally evaluated.
The right treatment depends on the type of insect, the location of the nest, the size of the colony, and whether the nest is inside or outside the structure.
Professional Wasp and Hornet Removal in Wisconsin
At Erdye’s Pest Control, we understand that stinging insect problems aren’t all the same.
A small paper wasp nest underneath an eave is very different from a large yellowjacket colony inside a wall or a hidden ground nest near where children play.
Our team can inspect the problem, identify the type of stinging insect, locate the nest when possible, and recommend the appropriate treatment.
We provide professional wasp removal, yellowjacket control, and stinging insect treatments throughout Wisconsin.
Whether you’re dealing with an active nest around your home, insects coming and going from your siding, or a hidden nest in your yard, we can help.
Don’t Let a Late-Summer Nest Ruin Your Backyard
Late summer should be a time for enjoying your yard—not worrying about getting stung every time you walk outside.
If you’ve noticed increased wasp, hornet, or yellowjacket activity around your home, don’t ignore the warning signs.
The longer a colony remains active, the larger the nest can become and the more workers may be present.
If you see repeated stinging insect activity around your home, call Erdye’s Pest Control for an inspection and professional treatment.
We proudly serve homeowners throughout Wisconsin, including Green Bay, Appleton, Sturgeon Bay, Wausau, Brookfield, and surrounding communities.
Think You Have a Wasp or Hornet Nest?
Don’t get too close. Don’t knock it down. And don’t wait for someone to accidentally disturb it.
Call Erdye’s Pest Control today for professional wasp, hornet, and yellowjacket removal in Wisconsin.
We’ll help you identify the problem, treat the nest, and get your outdoor space back.