If it feels like yellowjackets suddenly become much more noticeable around Elk Grove and South Sacramento toward the end of summer, there's a reason.
By August, yellowjacket colonies have had months to grow. What started as a small nest in the spring can now contain a large population of workers searching for food and defending the colony.
That's why late summer often brings more yellowjackets around backyard patios, garbage cans, outdoor meals, parks and even your lawn.
UC pest experts specifically identify late summer and fall as a time when yellowjackets become especially noticeable, and August is one of the key months for yellowjacket and wasp activity in California.
For homeowners throughout Elk Grove, Laguna, Vineyard, Florin and South Sacramento, knowing what to look for can help you spot a problem before accidentally getting too close to a nest.
Why Are Yellowjackets Worse in Late Summer?
Yellowjacket colonies begin much smaller earlier in the year.
A queen establishes a nest and begins producing workers. As the season progresses, those workers continue expanding the colony and searching for food.
By late summer, there can be significantly more yellowjackets moving around the surrounding area.
Their food preferences also change throughout the season.
Earlier in the year, yellowjackets frequently hunt insects and other protein sources. Later in summer, they're often attracted to sugary foods and drinks.
That makes Sacramento-area summer activities like:
- Backyard barbecues
- Pool parties
- Outdoor birthday parties
- Picnics
- Patio dining
- Sporting events
especially attractive to hungry yellowjackets.
UC guidance recommends keeping outdoor food covered and managing garbage and other food sources that may attract them.
Where Do Yellowjackets Build Nests Around Elk Grove Homes?
One of the biggest misconceptions about yellowjackets is that you'll always see a large hanging nest.
You may never see the nest itself.
Many yellowjackets nest underground, often taking advantage of abandoned rodent burrows and other existing cavities.
Others can establish nests inside protected areas of a structure.
Around Elk Grove and South Sacramento properties, potential nesting locations can include:
Holes in the Lawn
A small opening in the ground may not look significant.
But if you're seeing multiple yellowjackets repeatedly flying into and out of the same hole, there may be a nest underground.
Landscaping and Shrubs
Dense vegetation can provide protected areas where activity isn't immediately noticeable.
Retaining Walls
Gaps and cavities around walls can provide shelter.
Wall Voids
Yellowjackets can sometimes enter small exterior openings and establish colonies inside walls or ceilings.
Sheds and Outdoor Structures
Quiet, protected areas around sheds and other structures can also provide nesting opportunities.
UC advises that yellowjackets flying directly in and out of one specific location are likely traveling to and from a nest.
One of the Most Common Ways People Find a Yellowjacket Nest
Unfortunately, many homeowners don't discover a ground nest by seeing it.
They discover it while mowing the lawn.
A mower, weed eater, rake or even footsteps near a nest entrance can disturb the colony.
Yellowjackets aggressively defend their nesting area, and multiple workers may respond when the nest is threatened. UC specifically warns that yellowjackets can become aggressive when defending nests located in ground holes, walls and ceilings.
If you notice several yellowjackets repeatedly entering the same area of your lawn, landscaping or structure, avoid disturbing it.
Yellowjacket or Paper Wasp?
Not every black-and-yellow insect around your home is a yellowjacket.
Paper wasps are also common throughout the Sacramento region.
The behavior and nests are usually different.
Yellowjackets
Yellowjackets typically:
- Have compact yellow-and-black bodies
- Frequently nest underground or inside cavities
- Are attracted to food and sugary drinks
- Can become highly defensive near a nest
- Often appear around garbage cans and outdoor meals
Paper Wasps
Paper wasps typically:
- Have longer, more slender bodies
- Have noticeably long legs while flying
- Build exposed umbrella-shaped paper nests
- Commonly nest underneath rooflines and patio covers
- Are generally less aggressive away from their nest
Paper wasps can still sting, particularly if their nest is disturbed.
Correct identification matters because the nest location and treatment strategy may be completely different.
Why Yellowjackets Love Backyard Barbecues
There's a reason they seem to appear as soon as the food comes out.
Yellowjackets are opportunistic scavengers.
Meat, soda, fruit, desserts and other foods can attract foraging workers from nearby colonies.
UC recommends keeping food covered when eating outdoors and limiting accessible food sources.
A few simple habits can help:
Keep drinks covered.
Yellowjackets can enter open soda cans and cups unnoticed.
Clean spills quickly.
Sweet drinks are highly attractive.
Keep garbage containers closed.
Bring pet food indoors.
Clean grills and outdoor eating areas.
These steps won't eliminate an established nest, but they can make your patio less attractive to foraging yellowjackets.
What Should You Do If You Find a Yellowjacket Nest?
The most important thing is to avoid disturbing it.
Don't mow directly over the entrance.
Don't poke objects into the hole.
Don't attempt to dig the nest out.
And don't block the opening while the colony is active.
If yellowjackets are entering a wall or another part of your home, avoid sealing the opening before the colony has been properly addressed. Trapping an active colony inside a structure can create additional problems.
Professional treatment allows the nest location, yellowjacket species and surrounding conditions to be evaluated before determining the appropriate approach.
Why Is My Yellowjacket Trap Catching Some But Not All of Them?
Yellowjacket traps can be useful for reducing the number of foraging workers around outdoor living areas.
But a trap is not necessarily eliminating the colony.
If there's a mature underground nest nearby, workers will continue emerging from it.
That's why a homeowner may empty a trap repeatedly and still see yellowjackets every day.
Heavy activity around a property is worth investigating to determine whether a nearby nest is responsible.
Yellowjacket Control in Elk Grove and South Sacramento
Late summer is when many yellowjacket colonies are at their most noticeable.
If you're seeing an occasional yellowjacket around flowers, that's one thing.
If you're seeing constant activity around the same area, multiple yellowjackets entering a hole in the ground, or insects repeatedly disappearing into your home, there may be an established nest nearby.
At Pest Pros Pest Solutions, our team helps homeowners throughout Elk Grove, Laguna, Vineyard, Florin, Pocket, Greenhaven and the Greater Sacramento area identify and address yellowjacket problems around their properties.
Our Service Pros can inspect the area, locate potential nesting activity and determine the appropriate next step.
Don't Accidentally Find the Nest the Hard Way
If yellowjackets have taken over part of your yard, patio or outdoor space, give the Pros a call.
Pest Pros Pest Solutions offers no-cost, no-commitment pest inspections throughout the Greater Sacramento area.
Step Up to the Pros.
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