Brown recluse vs. wolf spiders: what's actually in your Kansas basement

Almost every spider call we take in Overland Park, Leawood and Olathe starts the same way: someone found a brown spider in the basement or garage and wants to know whether it's a brown recluse. Usually it isn't — but Kansas is genuinely within recluse range, so the question is worth answering carefully.

A brown recluse is small, roughly the size of a quarter with legs extended, uniformly tan to light brown with no banding or spots on the legs, and it has a darker violin shape on the front of its body pointing back toward the abdomen. It builds messy, irregular webbing in undisturbed places: stored boxes, behind shelving, inside crawl spaces, under a workbench.

A wolf spider is the one that startles people most. It's larger and stocky, hairy, patterned in brown and grey, and it doesn't build a web at all — it hunts on the ground, which is why you meet it running across a basement floor at night. Wolf spiders are not medically significant. Grass spiders and cellar spiders round out most of the rest of what we identify here.

Where they come from matters more than what they're called. Spiders follow their food. If insects are collecting around your exterior lights, in window wells, along the foundation or under the deck, spiders will settle in behind them. Firewood stacked against the house, mulch piled up over the siding line, and boxes sitting directly on a garage floor all create ideal harborage a few feet from a door.

These changes cut harborage and the insect supply spiders depend on:

On the treatment side, spraying a visible spider does very little. Our spider program removes webs and egg sacs by hand, treats the cracks, voids and harborage where spiders actually live, and maintains a quarterly exterior barrier plus eave de-webbing so populations don't rebuild. If we confirm brown recluse activity, we increase monitoring inside and focus heavily on storage areas and crawl spaces.

One practical note if you have kids or pets: recluse bites almost always happen when the spider is pressed against skin, not while it's crossing a floor.