Western Yellowjacket

Western Yellowjacket Identification and Control

Correct identification is an important first step in pest control.

Black and yellow colored Yellowjacket on a white background
Vespula pensylvanica
How to Identify a Western Yellowjacket

The western Yellowjacket is 3/8 to 5/8 of an inch long and are hairless. They are yellow and black in color with an abdomen that is blunt on the anterior side. 

Where Do They Come From

Western Yellowjackets are social insects who’s colony dies off every fall, but fertilized queens will overwinter. Queens start new colonies every spring that will grow throughout the summer months.

Their nests can be found in old rodent burrows, holes, structural voids, etc.  

Need Help Controlling Yellojackets?
Black and yellow colored Yellowjacket on a wooden fence

Why Are They Significant

Western yellowjackets pose a serious health risk to humans. Scavenging in the fall makes outdoor events dangerous.

Learn more by reading our blog post: Stinging Insect Guide: Bees, Hornets, & Wasps in Utah.


Vespula pensylvanica


Insects, nectar; scavengers for meat, sugar, human food, etc.


Serious health risk

Tips & Tricks

Black and yellow colored Yellowjacket on a wooden fence

What To Do About Yellowjackets

  • Monitor for wasp nests from early summer through fall.
  • Purchase and use a bee veil, suit and gloves.
  • Minimize nesting habitat around property.
  • Install tight-fitting screens in windows.
  • Never plug an entrance hole to a nest!
Black and yellow colored Yellowjacket on a white background

How To Remove Nest

  • Use a wet-vac to vacuum yellowjackets, then dig up nest.
  • This technique can be dangerous if not done properly.
  • Research the proper technique and always wear protective gear.
  • Do not attempt while people are present.
  • Apply a non-repellant insecticidal dust in and immediately around entrance hole(s) at night.
  • Consider hiring a professional.

Click here to learn more about how Thorn can help you with yellowjackets. 

Don’t let yellowjackets take over. Thorn can help.

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How To Control

Pests can be difficult to control, but that’s what we are here for. We create a strategic plan to gain control of your problem and make sure we get results.

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Thorn's Approach

We take a scientific approach to pest control. We start with an inspection and assessment to help us identify the pest, locate where they are, and create a specific plan for your property. Every home and business is different and requires a unique strategy.


Our Approach to Pest Control

Proper pest management starts with a detailed inspection and assessment from an expert pest professional before treatment. Thorn Pest Solutions uses a three-step process rooted in science to eliminate pests with long-term results.

Driven By Science. Lead By Service.

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Assess Situation

First, we identify the root problem(s) with a site assessment. Pests are almost always an indicator of an environmental condition. This will determine the best actions to provide short and your long-term results against pests.

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Execute Action Plan

Next, we develop a plan to fix the problems we discovered. This includes solving current pest issues, eliminating conducive conditions, and monitoring for future pest activity. Good pest management starts with a good plan.

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Track Success

Lastly, we implement the solutions we developed including inspection, monitoring, and preventing future pest infestations. Good pest control requires a good offense and not just defense. Prevention is key.

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