Keeping Hobo Spiders Out of Pacific Northwest Homes This Fall

September 08, 2026 · Regional Pest Guide Team · pacific-northwest spiders

As nights cool across Washington, Oregon, Idaho, and western Montana, hobo spiders start looking for a way indoors. Late summer into fall is mating season for this Pacific Northwest resident, and males in particular leave their webs to wander in search of females. That means more sightings in garages, basements, and window wells right when homeowners are least expecting them. Knowing what you are looking at, and what to do about it, keeps the season from feeling like an infestation.

Why Hobo Spiders Move Indoors in the Pacific Northwest This Fall

Hobo spiders (Eratigena agrestis) are established throughout the Pacific Northwest, particularly in Washington, Oregon, Idaho, and parts of western Montana, where the cool, damp climate suits them well. They build funnel-shaped webs low to the ground, in woodpiles, window wells, crawlspaces, and dense groundcover. Once temperatures drop and daylight shortens in September and October, adult males leave those webs to search for mates, which is why fall is when most people spot one indoors, usually moving fast across a basement floor or garage. Females tend to stay near their webs and are seen less often inside the house.

How to Identify a Hobo Spider

Correct identification matters, because hobo spiders are frequently confused with two other Pacific Northwest spiders: the giant house spider and various wolf spiders. A hobo spider has a brown, unmarked abdomen with a faint chevron pattern, legs without obvious banding, and a body around a half inch long excluding the legs. It does not have a shiny abdomen and does not climb well, which is a useful field test since it will usually struggle on smooth vertical surfaces like a bathtub.

A few identification points to check before assuming a spider is a hobo:

  1. Body length near half an inch, legs proportionally shorter than a wolf spider’s.
  2. Dull, uniformly brown abdomen with faint chevron markings, not bold stripes.
  3. Fast, low, ground-level movement rather than climbing.
  4. A funnel web low in vegetation, a woodpile, or a window well rather than an overhead cobweb.

For side-by-side photos and a closer look at the spiders it gets mistaken for, the spider identification guide covers regional look-alikes in more depth.

Hobo Spider Bite: Myth vs. Reality

Hobo spiders carry a reputation in the Pacific Northwest for causing necrotic skin wounds, but that claim has not held up. Early case reports from the 1980s and 1990s linked hobo spider bites to tissue death, and the species was added to lists of medically significant spiders on that basis. Since then, entomologists and the CDC have walked the claim back: controlled studies were unable to reproduce necrotic lesions from hobo spider venom, and many of the original cases were more likely bites from brown recluse spiders, which are not established in the Pacific Northwest, or were caused by something other than a spider entirely.

That does not mean every bite is harmless to ignore. Any spider bite can cause localized swelling, redness, or an allergic reaction, and skin infections from unrelated causes can look alarming. This is not medical guidance: if you have a suspected bite that is spreading, unusually painful, or accompanied by fever or other systemic symptoms, see a doctor or urgent care provider rather than trying to diagnose it yourself from a photo online.

Where Hobo Spiders Hide Indoors This Time of Year

Once inside, hobo spiders gravitate toward the same low, undisturbed spaces they favor outdoors: basements, crawlspaces, garage corners, and the gap behind stored boxes. Window wells are a particularly common entry point in the Pacific Northwest, since they collect leaf litter and stay damp well into fall.

Spiders are rarely the only thing moving indoors as nights get colder. Mice and other rodents follow the same temperature drop into garages and crawlspaces, and the two problems often show up in the same season. If you are already sealing entry points for spiders, it is worth checking the guide to winterizing your home against rodents at the same time, since much of the sealing work overlaps.

Fall-Proofing Your Home Against Hobo Spiders

Exclusion is the most reliable control method, and it holds up better through a wet Pacific Northwest winter than any spray. Focus on the gaps hobo spiders and other fall invaders actually use to get in:

  1. Caulk visible gaps around foundation vents, pipe penetrations, and window frames.
  2. Add or replace weatherstripping on garage and exterior doors.
  3. Install door sweeps on exterior doors, especially garage service doors.
  4. Clear leaf litter and debris out of window wells before the fall rains start.
  5. Set sticky traps along baseboards in basements and garages to monitor activity without pesticide.

For a broader fall checklist that covers other regional pests moving indoors on the same schedule, see the fall pest prevention checklist.

Natural and Safe Control Methods for Hobo Spiders

Indoors, regular vacuuming (including corners, behind furniture, and window wells) removes both spiders and the webs they rely on, and decluttering basements and garages removes the low, undisturbed hiding spots hobo spiders prefer. Reducing outdoor lighting near entry doors also helps, since bright porch lights draw in the small insects hobo spiders feed on.

If exclusion and monitoring are not enough and you decide to use a chemical perimeter treatment, follow the product label instructions exactly, and note that some pesticide applications require a restricted-use applicator license depending on the product and your state. For a fuller rundown of non-chemical options first, the guide to natural pest control methods is a good starting point.

Hobo spiders are a normal part of a Pacific Northwest fall, not a sign that something has gone wrong with your home. Identify what you are seeing, seal the obvious entry points before the rain sets in, and keep an eye on the low, cluttered corners where they like to settle.

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