Brown recluse spiders are native to the south-central and midwestern United States, established across 16 states: Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, Ohio, Oklahoma, Tennessee, and Texas. Outside this range, they are rarely found, despite being one of the most commonly blamed spiders for bites across the country.
The 16-State Range
The brown recluse’s core territory stretches from eastern Texas through the Gulf states, up through the Midwest, and east into parts of Ohio and Georgia. The southeastern edge of their range cuts through central Georgia. They’re common in Tennessee and Alabama but not native to Florida. In the western half of the country and throughout the Northeast, brown recluses simply don’t have established populations.
This matters because the spider is routinely blamed for skin wounds in states where it doesn’t live. Medical misdiagnosis of brown recluse bites in non-endemic areas is so widespread that it has undermined research into actual treatments. Other conditions, including bacterial infections like MRSA, can produce similar-looking necrotic wounds and are far more likely culprits outside the 16-state range. If you live in California, New York, or Florida and someone tells you a skin lesion is a brown recluse bite, skepticism is warranted.
Could the Range Be Expanding?
Climate modeling from the University of Kansas suggests the brown recluse’s range could shift northward as temperatures warm. Parts of Minnesota, Wisconsin, Michigan, South Dakota, and Pennsylvania may become suitable habitat in the future. This doesn’t mean the spiders have already colonized those areas. Isolated specimens occasionally turn up outside the native range, hitchhiking in boxes or furniture during moves, but these are individual stragglers, not breeding populations.
Where They Hide Indoors
Within their native range, brown recluses thrive in human-made environments. They’re called “recluse” for a reason: they seek out dark, undisturbed spaces and avoid open areas. The most common indoor hiding spots are cardboard boxes in storage, especially in garages, basements, and attics. They also settle into closets with rarely worn clothing, behind wall-mounted pictures, inside stacked papers or magazines, and in the gaps around door frames.
The scale of indoor infestations can be startling. In one documented case in Lenexa, Kansas, researchers collected 2,055 brown recluse spiders from a single occupied home over six months. At least 400 were large enough to deliver a medically significant bite. More typical infestations in Missouri and Oklahoma homes yielded 30 to 45 spiders each. The Kansas case is extreme, but it illustrates something important: these spiders can live in large numbers alongside people, often without anyone being bitten.
Outdoor Habitats
Outside, brown recluses favor the same principle: tight, sheltered crevices. You’ll find them under woodpiles, plywood sheets, rubber tires, tarps, and overturned trash cans. Rock piles and hollow logs also provide the dark, dry spaces they prefer. Items stored directly against the exterior of your home create a bridge between outdoor and indoor habitat, making it easier for spiders to move inside.
When They’re Most Active
Brown recluse activity follows a clear seasonal pattern. Nearly all encounters happen between April and October, with peaks in spring and late summer. During November through March, activity drops to almost nothing. Only about 4% of confirmed brown recluse bites occur in those cold months. This timeline tracks with the spiders’ mating season and general metabolic activity. If you’re sorting through stored boxes or pulling out seasonal gear in the warmer months, that’s when you’re most likely to stumble across one.
How to Confirm You’re Looking at One
Brown recluses are frequently misidentified, partly because many common house spiders are brown. Two features are definitive. First, the violin-shaped marking on the front body segment, with the neck of the violin pointing toward the back of the spider. Many people know this one. The more reliable feature is the eyes: brown recluses have six eyes arranged in three pairs, one pair in front and one pair on each side. Most spiders have eight eyes. You’ll need a magnifying glass to count them, but it’s the single best way to confirm identification.
Keeping Them Out of Your Home
If you live in the brown recluse’s range, practical exclusion is the most effective long-term strategy. Caulking cracks and gaps in your home’s exterior walls and foundation reduces entry points for both spiders and the insects they eat. Installing insect screening over vents adds another layer of protection. Roofs with solid plywood backing are less hospitable than shake roofs, which create the kind of layered crevices recluses love.
Inside, storage habits make a big difference. Keep boxes off the floor and a few inches away from walls and each other so you’re not creating the tight, dark gaps recluses prefer. Tape shut the open edges of any cardboard boxes. Better yet, swap cardboard for sealed plastic bins. Seasonal clothing, gardening gloves, boots, and sports equipment should be stored in closed containers, not left in open piles. Before putting on shoes or clothes that have been sitting in a closet or garage for weeks, give them a shake. That simple habit eliminates most of the risk of an accidental bite.
Outdoors, clear woodpiles, old tires, and stacked materials away from the house. Reducing clutter within a few feet of your foundation removes the staging area spiders use before finding their way inside.