Tennessee is home to at least 11 species of orb weaver spiders, ranging from the large black and yellow garden spider to the tiny arrow-shaped micrathena. These are the spiders responsible for the classic circular webs you walk through on trails, find stretched across your porch railings, or spot glistening in garden beds. All of them are harmless to people.
Common Species You’ll Find in Tennessee
The most recognizable orb weaver in the state is the black and yellow garden spider, a striking species with bold yellow and black banding on the abdomen and legs that can span several inches. Females build large webs in sunny garden areas, often with a distinctive zigzag pattern of silk running down the center. You’ll spot these most frequently from midsummer through early fall.
The Hentz orb weaver is probably the species you’ll encounter most often around Tennessee homes in autumn. These are medium-sized spiders, typically brown or rusty orange with a rounded abdomen, and they love building webs near porch lights where insects gather. The marbled orb weaver is similar in size but easier to identify thanks to its orange, yellow, or cream-colored abdomen with darker marbling patterns that look almost hand-painted.
A few Tennessee orb weavers look nothing like the stereotypical spider. The spiny-backed orb weaver has a wide, flat, crab-shaped body with six prominent spines along its edges, almost like a tiny medieval shield. The arrow-shaped micrathena and arrowhead orb weaver both have distinctly pointed abdomens. These smaller species typically build webs in wooded areas rather than around homes.
Other species present in the state include the giant lichen orb weaver (a large, camouflaged species found on tree trunks), the furrow orb weaver (common near buildings and bridges), and the orchard orb weaver, a small, colorful spider with an iridescent green body often found in shaded woodland edges.
Woodland Species Hikers Should Know
If you hike Tennessee’s oak-hickory forests, especially near creeks and rivers, you’ll almost certainly walk face-first into micrathena webs at some point. These small spiders build webs three to eight inches across, suspended four to seven feet above the ground in shaded gaps between trees. They’re notorious for stringing long draglines across trails.
Females are less than half an inch long and carry five pairs of pointed spines on their abdomen, a feature thought to deter birds and other predators from eating them. Males are smaller, flattened, and often lack spines entirely. Four species of micrathena live east of the Great Plains, and Tennessee falls well within their range. Despite their spiky appearance, they’re completely harmless. The webs are more of a nuisance than the spiders themselves.
The Joro Spider: Tennessee’s Newest Arrival
The Joro spider, a large orb weaver native to East Asia, has established itself in Tennessee after first appearing in Georgia around 2014. These spiders have since spread throughout northern Georgia and into adjacent areas of Alabama, the Carolinas, and Tennessee. Joro spiders are hard to miss. Females have bright yellow, blue, and red banding on their bodies with leg spans reaching three to four inches, and they build golden-colored webs that can stretch several feet across.
If you see a web that seems unusually large and has a slightly golden tint to the silk, you may be looking at a Joro spider’s work. Despite their size, Joro spiders carry no more danger to humans than any other orb weaver. Their long-term ecological impact on Tennessee’s native spider populations is still being studied.
Are Orb Weavers Dangerous?
Orb weavers are docile and reluctant to bite. They rely on their webs for defense and food, not aggression, and will typically drop out of the web and flee before resorting to biting. If one does bite, the symptoms are mild: localized pain, slight numbness, and some swelling. Nausea and dizziness occur rarely. The venom is designed to paralyze insects, not harm mammals, and orb weavers pose no significant risk to human life.
The distinction matters in Tennessee because the state does have two medically significant spiders: the brown recluse and the black widow. Knowing the differences keeps you from worrying about the wrong spider. Orb weavers are almost always found sitting in the center of organized, circular webs. No other common spider in the region builds that kind of web. If you see a round, grid-like web with a spider waiting in the middle, it’s an orb weaver.
Brown recluses, by contrast, are uniformly tan to dark brown, about the size of a quarter with legs outstretched, and have a dark violin-shaped mark on their back. They hide in undisturbed spaces like closets and storage boxes, never in open webs. Black widows are glossy black with red markings on the underside of a nearly spherical abdomen. They build irregular, tangled webs in sheltered spots like woodpiles and garages. Both are timid and unlikely to bite unless physically handled, but their bites do require medical attention.
When Orb Weavers Are Most Active
Orb weaver activity in Tennessee peaks in late summer and fall. This is when females reach their full adult size and spin the largest webs, often working day and night. The timing is driven by reproduction: females need to feed heavily before laying eggs. A single egg sac, typically rolled inside a curled leaf, can contain around 1,000 eggs.
By late October or November, most adult orb weavers have laid their eggs and died. The egg sacs overwinter and hatch in spring, releasing tiny spiderlings that disperse by “ballooning,” releasing silk threads that catch the wind and carry them to new locations. Through spring and summer, the spiders grow but remain small and inconspicuous. It’s only in September and October that they become large and obvious enough for most people to notice, which is why orb weaver sightings spike every fall.
Why They’re Worth Keeping Around
Orb weavers are highly effective pest control. By positioning their webs in areas with heavy insect traffic, they capture and consume large numbers of flies, mosquitoes, gnats, moths, and beetles. A single web can trap dozens of insects per day. In gardens, this helps reduce populations of plant-damaging insects without any chemical intervention.
If a web is in an inconvenient spot, like across a doorway or walkway, you can simply relocate the spider by gently guiding it onto a stick or piece of cardboard and moving it to a nearby shrub or fence. The spider will build a new web within a day or two. Repeatedly knocking down webs in a particular spot will also discourage the spider from rebuilding there. There’s no practical reason to kill orb weavers, and removing them from your yard means losing a free, round-the-clock insect management system.