Louisiana’s warm, humid climate is ideal habitat for some impressively large spiders. Most of the big ones you’ll encounter are harmless to people, and several are genuinely beneficial, eating mosquitoes and other pest insects in large numbers. Here’s what you’re likely seeing and what to know about each one.
Golden Silk Orbweaver
If you’ve walked face-first into a massive golden web stretched between trees, you’ve met the golden silk orbweaver, sometimes called the banana spider. These are the most visually striking large spiders in Louisiana. Females have a body length of 24 to 40 mm (roughly 1 to 1.5 inches), with legs that extend their total size considerably beyond that. Males are tiny by comparison, averaging just 6 mm.
The female’s coloring is distinctive: a silvery head, a tan or dull orange cylindrical body dotted with yellow spots, and brown-and-orange banded legs with noticeable tufts of hair on certain leg segments. Their webs are semi-permanent structures, often 1 to 2 meters in diameter, positioned to intercept flying insects above low vegetation. The hub of the web sits near the top rather than the center, giving it a lopsided look. You’ll find these webs in yards, along trails, and at the edges of wooded areas from late summer through fall. The silk itself has a golden sheen in sunlight, which is how the spider gets its name.
Golden silk orbweavers are not aggressive and their bite, while possible if you handle one roughly, causes only mild local irritation comparable to a bee sting.
Carolina Wolf Spider
The Carolina wolf spider is the largest wolf spider in North America and one of the most common big spiders people encounter in Louisiana. Females reach 22 to 35 mm in body length (up to about 1.4 inches), while males measure 18 to 20 mm. With legs included, a large female can span the width of your palm.
These spiders are mottled light brown on top with darker brown patterning on the back and a black underside. Males sometimes show orange coloring along the sides of the abdomen. Unlike orbweavers, wolf spiders don’t build webs to catch prey. They’re ground hunters, actively chasing down insects, and they prefer flat, open areas. That’s why you’ll often spot them running across garage floors, patios, and driveways at night. They’re fast, which makes them startling, but their bite is not medically significant to humans.
Huntsman Spider
The pantropical huntsman spider has established itself across subtropical areas of the Gulf Coast, including southern Louisiana. Adults have a body length of about an inch, but their leg span reaches 3 to 5 inches, making them look enormous. They’re flat-bodied, which allows them to squeeze into surprisingly tight cracks and crevices.
Huntsman spiders are commonly found in houses, barns, sheds, and garages. In warm weather they move freely between indoor and outdoor spaces. In cold weather they stay indoors, hiding behind wall hangings, under furniture, and inside closets. They don’t build webs. Instead, they rely on speed and strong jaws to catch insects. Finding one on your wall at night can be alarming given their size, but they’re not dangerous to people. They’re actually effective pest controllers, eating cockroaches and other household insects.
Southern House Spider
The southern house spider is another large species you’re likely to find around Louisiana homes. Females are dark brown to charcoal and build messy, tangled webs in crevices, shutters, and corners of exterior walls. Males are often mistaken for brown recluse spiders because of their similar coloring and long legs, but the two are not closely related and the southern house spider’s bite is harmless.
These spiders tend to stay in their webs near outdoor lighting, where insects are drawn at night. They’re one of the most common “big spider on the porch” species in the state.
American Nursery Web Spider
Nursery web spiders round out Louisiana’s lineup of large spiders. They resemble wolf spiders in shape and size but have a distinctive behavior: females carry their egg sacs in their jaws rather than attached to their spinnerets. When the eggs are close to hatching, the female builds a tent-like “nursery web” in vegetation and guards it. You’ll find them in gardens, tall grass, and near water. Like the others on this list, they pose no real threat to people.
Which Louisiana Spiders Are Actually Dangerous
None of the big, conspicuous spiders described above are medically dangerous. The two spiders in Louisiana that can cause serious harm are actually small and inconspicuous: the black widow and the brown recluse.
Brown recluse bites are particularly concerning. The venom destroys surrounding tissue, and what starts as a small red bite can develop over several days into a painful, darkening wound. In severe cases the tissue dies, forming a black crust and an ulcer that can penetrate into fat and muscle. Some bite victims also develop fever, chills, and nausea. Brown recluses are small, tan spiders with a violin-shaped marking on their back, and they hide in undisturbed spaces like cardboard boxes, closets, and woodpiles.
The important takeaway: a large spider in Louisiana is almost certainly harmless. The dangerous ones are the small, reclusive ones you don’t notice.
Keeping Large Spiders Out of Your Home
If you’d rather not share your living space with palm-sized spiders, a few practical steps make a real difference. Move firewood, stacked materials, and debris away from your home’s foundation, since these create harborage areas that spiders use as staging grounds before moving indoors. Trim shrubs, vines, and tree limbs that touch the house, because these give spiders a direct bridge to your walls and roof.
Outdoor lighting is a major spider magnet, not because spiders are attracted to light, but because their insect prey is. Switching to yellow or sodium vapor bulbs at exterior entrances draws fewer night-flying insects, which in turn means fewer spiders setting up shop near your doors. Sealing gaps around windows, doors, and utility penetrations also helps, especially for flat-bodied species like the huntsman that can slip through remarkably narrow openings.
For spiders already inside, a simple glass-and-cardboard capture lets you relocate them outdoors where they’ll do the most good eating pest insects. Most large Louisiana spiders are solitary, so removing one typically solves the immediate problem.