Sac Spider

Sac Spider Identification and Control

Correct identification is an important first step in pest control.

Yellow colored sac spider
Cheiracanthium spp.
How to Identify a Sac Spider

Sac spiders are a yellowish color. The ends of their legs have brown to black tufts of hairs that look like socks. They have eight eyes. 

Where Do They Come From

Sac spiders can be found indoors and outdoors. They can be found under bark, rocks, leaf litter, in rolled leaves, behind or in clutter and storage. They often make a silk, saclike retreat where walls meet other walls or ceilings, or other hidden places. They spend the day in the sac and hunt at night. They easily climb slick surfaces.

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Sac spider head close up

Are They Dangerous

They are not known to be a health hazard, but can aggressively bite when trapped against the skin. And they have a painful bite similar to a bee sting.

Learn more by reading our blog post: Utah Spiders: Guide to Identification and Prevention.


Cheiracanthium spp.


Painful bites


Nocturnal, meaning they are awake at night

Tips & Tricks

Yellow colored sac spider

How To Keep Spiders Away

  • Minimize their harborage around the property.
  • Seal exterior cracks and crevices to reduce hiding places.
  • Install tight-fitting door sweeps and window screens.
  • Change exterior lighting to sodium vapor or yellow bulbs.
  • Regularly vacuum individuals and webs.
  • Reduce clutter indoors and outdoors.
  • Reduce insects that serve as food. 
Yellow-green colored sac spider with an egg sac

About Yellow Sac Spiders

These small spiders are hunters capturing their prey by running up onto them. They often make a silent retreat to hide in. These spiders were not common in the US in the early 1900s but have become a common household spider across the United States. These spiders do have a painful bite and are more prone to biting than other spiders of similar size.

Don’t let spiders 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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