Two Spiders You Should Know in Montana — But Only One Is Truly Dangerous

Spiders are a part of life in Montana, but only a few are worth paying close attention to. In Montana, the black widow spider is the only species commonly found that carries venom harmful to humans. Known for its shiny black body and signature red hourglass marking, the black widow tends to stay hidden in dark, quiet areas—think woodpiles, garages, and sheds. If bitten, symptoms can include severe pain, cramping, and nausea, which may require medical attention. While not aggressive by nature, this spider is one to take seriously.

The Black Widow Spider — Small but Serious

Black widows are the only spiders commonly found in Missoula with venom that’s dangerous to humans. They’re easy to identify once you know what to look for:

• A glossy black body

• A bright red hourglass on the underside of the abdomen

• Usually found in dark, undisturbed areas like woodpiles, sheds, basements, or under outdoor furniture

Their bite isn’t common, but when it happens, you’ll feel it. Symptoms can include muscle cramps, nausea, and intense pain. If you see one—or think you’ve seen one—it’s time to call your pest control guy. Don’t wait until there’s a bite to take action.

The Hobo Spider — More Hype Than Harm

The hobo spider, sometimes referred to as the aggressive house spider, has developed an alarming reputation that research no longer supports. Despite the name, this spider is not aggressive toward humans and does not pose a serious medical threat.

It’s typically brown with a distinct chevron or herringbone pattern along its back. Hobo spiders prefer dark, undisturbed spaces and often build funnel-shaped webs in basements, wall voids, or along building foundations.

While past reports suggested its bite could cause severe tissue damage, current research—including findings from Montana-based experts—shows no medically significant effects. In most cases, a bite causes only mild irritation, similar to a bee sting.

If you encounter a hobo spider in your home, there’s no need to panic. However, if sightings become frequent or webs begin appearing in common areas, it’s wise to consult a pest control professional to assess and manage the situation effectively.

When to Contact a Pest Control Professional

If you spot a black widow spider—inside or outside your home—it’s time to call a pest control expert immediately. Even a single sighting should be taken seriously due to the potential health risks.

You should also reach out if you notice multiple spiders of any kind appearing frequently, especially in living spaces, basements, or near entry points. Homes with young children, pets, or outdoor gathering areas should be monitored closely to minimize risk.

While black widows pose a serious concern, even non-dangerous spiders like the hobo spider can become a persistent nuisance if left unchecked. Spider activity typically increases in late summer and early fall as they seek warmth indoors—making preventative action essential.

If you're unsure about what you're dealing with, or simply want peace of mind, our team is ready to help. We offer fast, professional assessments and targeted treatment to keep your home spider-free.

Book your free inspection today and let’s take care of it—before it becomes a bigger problem.