Tennessee is home to at least 46 documented spider species, but only two are venomous enough to cause real harm: the brown recluse and the black widow. Both are found in every Tennessee county. The rest, from garden orb-weavers to jumping spiders, are harmless and actually help control insect populations around your home.
The Two Venomous Species
Brown Recluse
The brown recluse is the spider most Tennesseans worry about, and for good reason. Its bite can cause a slow-healing wound that destroys surrounding skin tissue. That said, these spiders live up to their name. They prefer dark, undisturbed spaces like closets, attics, cardboard boxes, and woodpiles, and they rarely bite unless pressed against skin.
Identifying a brown recluse means looking for a few specific features. The body is about 3/8 of an inch long (never larger than half an inch) and ranges from light tan to dark brown. The legs are uniformly light-colored with no stripes or bands, and they’re covered in fine hairs rather than spines. The most talked-about marking is the dark violin shape on the front portion of the body, with the “neck” of the violin pointing toward the back. But the most reliable feature is the eyes: brown recluses have six eyes arranged in three pairs, while nearly all other spiders have eight. If you can get close enough to count, that single detail rules out most lookalikes.
One important note: many skin wounds blamed on brown recluses turn out to be something else entirely. A prominent toxicology physician estimated that 60% of “brown recluse bite” diagnoses came from areas where recluse spiders don’t even live. MRSA bacterial infections, flea bites, and bed bug reactions all produce similar-looking lesions. If you develop multiple sores at once, that points strongly toward a bacterial infection or biting insect rather than a spider, since a recluse would only bite once.
Black Widow
Tennessee has both the northern and southern black widow, with the southern species being more common. The southern black widow is the classic version: glossy black body, red or orange hourglass on the underside of the abdomen. Northern black widows look slightly different. Their hourglass marking is split or incomplete, and they often have a row of red spots along the top of the abdomen with white stripes on the sides.
Black widows build messy, irregular webs close to the ground, typically in old stumps, hollow logs, brush piles, crawlspaces, and shed corners. They hang upside down in the web, which is why you usually spot the hourglass marking first. Their venom is a neurotoxin that causes intense muscle cramping and pain, but fatalities are extremely rare in healthy adults with access to medical care.
Common Harmless Spiders You’ll See
The overwhelming majority of spiders you encounter in Tennessee pose no threat. Here are some of the most frequently spotted:
- Black and yellow garden spider: Large, striking orb-weaver with bold yellow and black markings. Builds huge circular webs in gardens and along fences. Completely harmless and a voracious insect predator.
- Bold jumping spider: Small, stocky, black with white spots. These curious spiders don’t build webs to catch prey. Instead they stalk and pounce on insects. They’re often found on windowsills and exterior walls.
- Common house spider: The most likely spider sharing your home. Small, brownish-gray, builds cobwebs in corners. Responsible for most of the wispy webs you find in garages and basements.
- Dark fishing spider: One of the largest spiders in Tennessee, with a leg span that can exceed three inches. Found near water, rocks, and tree trunks. Despite their intimidating size, they’re not dangerous to people.
- Wolf spiders: Several species live in Tennessee, including the tiger wolf spider. They’re ground hunters that don’t spin webs, and they sometimes wander indoors. Large and fast, but their bite is comparable to a bee sting.
- Jorō spider: A relatively recent arrival originally from East Asia, now confirmed in Tennessee. Builds enormous golden webs between trees and power lines. Despite alarming headlines, it’s not medically significant to humans.
- False black widow: Dark and round-bodied enough to cause a scare, but lacks the red hourglass. Common in homes and outbuildings. Its bite may cause mild irritation at most.
Orb-weavers alone account for a large portion of Tennessee’s spider diversity, with species like the marbled orb-weaver, spiny-backed orb-weaver, arrowhead orb-weaver, and orchard orb-weaver all building their distinctive circular webs across the state. If you see a spider sitting in the center of a symmetrical web, it’s almost certainly harmless.
When Spiders Are Most Active
Spider sightings in Tennessee peak in August and September. Warm days combined with cooling nights drive spiders to move more, and this period also coincides with mating season for many species. Males wander in search of mates, which is why you suddenly notice more spiders indoors during late summer even if they’ve been living nearby for months.
Activity stays relatively high through October, then drops off from November through May. June and July see moderate activity as spider populations grow through the warm season. If you’re finding spiders inside your house in the dead of winter, they likely moved in during fall and have been living in undisturbed spaces since then.
What to Do If You’re Bitten
For a suspected black widow bite, seek medical care right away. Apply a cloth-wrapped ice pack to the bite site to slow swelling and reduce pain, and elevate the area if possible. Do not try to suck out the venom. You can also call the National Capital Poison Control Center at 1-800-222-1222 for guidance. Treatment at a hospital typically focuses on managing muscle pain and spasms.
Brown recluse bites often aren’t immediately painful, which means you may not realize you’ve been bitten for several hours. The area gradually becomes red, swollen, and tender, sometimes developing a blister or open sore over the following days. If you notice a wound like this and you were recently in spaces where recluses live (storage areas, attics, old boxes), see a healthcare provider. Early treatment helps prevent tissue damage from spreading.
Keep in mind that capturing or photographing the spider, if you can do so safely, helps enormously with diagnosis. Many supposed spider bites turn out to be infections or other insect bites, and confirming the species changes how the wound is treated.
Keeping Spiders Out of Your Home
Regular, thorough cleaning is the single most effective spider deterrent. A vacuum cleaner removes spiders, webs, and egg sacs, and destroying those egg sacs matters because each one can contain hundreds of baby spiders. Pay special attention to closets, garages, basements, attics, and any area that stays quiet and undisturbed, since those are exactly the conditions spiders prefer.
Outside, move firewood, stacked materials, and debris away from your foundation. Trim shrubs, vines, and tree branches that touch the house, as these give spiders a direct bridge to your walls and roofline. Install tight-fitting window screens and door sweeps to block entry points.
Inside, reducing clutter is key. Cardboard boxes stored in basements and garages are prime brown recluse habitat. Switching to sealed plastic bins and keeping storage areas organized makes those spaces far less inviting. A bright flashlight and periodic inspection of cracks, corners, and dark recesses will help you catch problems before they grow. If you’re shaking out shoes, gloves, or clothing that’s been sitting in a garage or storage room, you’re already practicing the most practical recluse-avoidance habit there is.