Hobo spiders are common across Utah and frequently show up inside homes from August through October, when males roam in search of mates. If you’ve spotted a brown, funnel-web-building spider in your house during late summer or early fall, there’s a good chance it’s a hobo spider. The good news: these spiders are far less dangerous than their reputation suggests.
When Hobo Spiders Enter Utah Homes
Hobo spiders live outdoors year-round, but you’re most likely to encounter them indoors during a narrow three-month window. From August through October, males leave their webs and wander through homes looking for females to mate with. This roaming behavior is what brings them into living spaces, garages, and basements. Outside of this season, hobo spiders mostly stay hidden in ground-level webs and aren’t nearly as visible.
During this peak season, Utah State University Extension describes “an influx of hobos and other spiders entering the home.” The spiders aren’t attracted to people. They’re simply moving through dark, sheltered spaces at ground level, which means you’ll find them along baseboards, behind furniture, in closets, and near exterior doors.
How to Identify a Hobo Spider
Hobo spiders are brown, medium-sized (roughly the size of a quarter with legs extended), and build funnel-shaped webs close to the ground. Their coloring is fairly uniform brown with a chevron-like pattern on the abdomen, though this can be hard to see without magnification. They lack the distinctive markings that make other spiders easy to identify: no violin shape on the back, no red hourglass, no bold stripes on the legs.
This plain appearance is actually the problem. Hobo spiders look a lot like other harmless funnel-weaving spiders, particularly grass spiders, which are also common in Utah. Telling them apart with the naked eye is difficult even for experienced observers. Positive identification typically requires a microscope to examine the spider’s reproductive structures. For practical purposes, if you’re finding brown funnel-web spiders at ground level during August through October, hobo spiders are a strong possibility.
Are Hobo Spider Bites Dangerous?
For years, hobo spiders were labeled as having a necrotic (flesh-destroying) bite similar to the brown recluse. That reputation has largely been walked back. Harvard Health Publishing now groups hobo spider bites alongside yellow sac spiders and wolf spiders, noting that while they can pierce the skin, the bite is “similar to a bee sting” and causes “redness and itching around the area” but is “unlikely to cause complications.”
Most hobo spider bites can be handled at home. Wash the area with warm, soapy water, apply an ice pack to reduce swelling, and take an over-the-counter antihistamine if the itching is bothersome. A basic antibiotic cream on the bite site helps prevent secondary infection. Pain relievers like ibuprofen or acetaminophen can manage any lingering discomfort.
One important detail for Utah residents: brown recluse spiders are not found in Utah. Only one species of brown spider has a range that possibly reaches the southwestern tip of the state, and even that is uncertain. Brown recluses can occasionally hitchhike in shipped items or vehicles, but the odds of encountering one in Utah are very small. Many bites blamed on brown recluses in Utah are likely from hobo spiders, other common spiders, or not spider bites at all.
Keeping Hobo Spiders Out of Your Home
Prevention starts with sealing entry points. Caulk foundation cracks with silicone sealant and install weather stripping around doors and windows. These are the main routes spiders use to get inside, and blocking them makes a meaningful difference.
Inside, regular vacuuming removes spiders, their webs, and the insects they feed on. Pay attention to dark, protected spots: behind furniture, along door jambs, and in corners at floor level. Keeping furniture a few inches from the wall eliminates some of the sheltered spaces hobo spiders prefer. Reducing general clutter, especially in basements, garages, and closets, removes hiding places.
Sticky traps are one of the most effective monitoring and control tools. Place them along baseboards near exterior doors, behind door jambs, and alongside furniture. During peak season (August through October), placing up to two traps per room increases your chances of catching wandering males before you encounter them yourself. Outdoors, switching exterior light bulbs to sodium vapor lights attracts fewer insects, which in turn attracts fewer spiders to the perimeter of your home.
Reducing Bite Risk During Peak Season
From August through October, a few simple habits lower your chances of an unwanted encounter. Keep beds at least 8 inches from the wall, and remove bed skirts that drape to the floor, since these create a bridge for spiders to climb up. Pick up clothing, blankets, and children’s toys from the floor rather than leaving them in piles where a spider could hide. Shake out shoes, gloves, and clothing that have been sitting in dark areas before putting them on.
If you choose to use chemical treatments, keep in mind that spiders walk on the tips of their claws, so their bodies make minimal contact with treated surfaces. Sprays work best when applied directly to webs and spiders or into tight crevices rather than across broad floor areas. Outdoor insecticide applications are most effective in May and June when hobo spider eggs hatch, well before adults become a nuisance indoors later in the summer.